DSA problems I have solved in both LeetCode and gfg

LeetCode Topics

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0015-3sum
0016-3sum-closest
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0033-search-in-rotated-sorted-array
0036-valid-sudoku
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0041-first-missing-positive
0042-trapping-rain-water
0045-jump-game-ii
0046-permutations
0047-permutations-ii
0048-rotate-image
0049-group-anagrams
0051-n-queens
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0063-unique-paths-ii
0064-minimum-path-sum
0066-plus-one
0074-search-a-2d-matrix
0078-subsets
0079-word-search
0088-merge-sorted-array
0090-subsets-ii
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0120-triangle
0122-best-time-to-buy-and-sell-stock-ii
0128-longest-consecutive-sequence
0130-surrounded-regions
0135-candy
0136-single-number
0137-single-number-ii
0139-word-break
0153-find-minimum-in-rotated-sorted-array
0164-maximum-gap
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0189-rotate-array
0198-house-robber
0200-number-of-islands
0209-minimum-size-subarray-sum
0215-kth-largest-element-in-an-array
0216-combination-sum-iii
0219-contains-duplicate-ii
0238-product-of-array-except-self
0239-sliding-window-maximum
0260-single-number-iii
0268-missing-number
0283-move-zeroes
0287-find-the-duplicate-number
0322-coin-change
0347-top-k-frequent-elements
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0417-pacific-atlantic-water-flow
0435-non-overlapping-intervals
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0462-minimum-moves-to-equal-array-elements-ii
0463-island-perimeter
0474-ones-and-zeroes
0525-contiguous-array
0532-k-diff-pairs-in-an-array
0542-01-matrix
0560-subarray-sum-equals-k
0594-longest-harmonious-subsequence
0621-task-scheduler
0645-set-mismatch
0658-find-k-closest-elements
0695-max-area-of-island
0713-subarray-product-less-than-k
0724-find-pivot-index
0733-flood-fill
0747-min-cost-climbing-stairs
0750-contain-virus
0792-binary-search
0797-rabbits-in-forest
0835-linked-list-components
0854-making-a-large-island
0876-hand-of-straights
0878-shifting-letters
0881-loud-and-rich
0905-length-of-longest-fibonacci-subsequence
0907-koko-eating-bananas
0917-boats-to-save-people
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0940-fruit-into-baskets
0945-snakes-and-ladders
0954-maximum-sum-circular-subarray
0966-binary-subarrays-with-sum
0979-di-string-match
0990-verifying-an-alien-dictionary
1014-k-closest-points-to-origin
1016-subarray-sums-divisible-by-k
1019-squares-of-a-sorted-array
1024-triples-with-bitwise-and-equal-to-zero
1031-add-to-array-form-of-integer
1034-subarrays-with-k-different-integers
1036-rotting-oranges
1037-minimum-number-of-k-consecutive-bit-flips
1046-max-consecutive-ones-iii
1050-construct-binary-search-tree-from-preorder-traversal
1055-pairs-of-songs-with-total-durations-divisible-by-60
1073-number-of-enclaves
1111-minimum-score-triangulation-of-polygon
1127-last-stone-weight
1171-shortest-path-in-binary-matrix
1217-relative-sort-array
1256-rank-transform-of-an-array
1319-unique-number-of-occurrences
1335-maximum-candies-allocated-to-k-children
1350-remove-sub-folders-from-the-filesystem
1353-find-resultant-array-after-removing-anagrams
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1396-count-servers-that-communicate
1407-group-the-people-given-the-group-size-they-belong-to
1424-maximum-candies-you-can-get-from-boxes
1477-product-of-the-last-k-numbers
1478-maximum-number-of-events-that-can-be-attended
1482-how-many-numbers-are-smaller-than-the-current-number
1483-rank-teams-by-votes
1510-find-lucky-integer-in-an-array
1538-maximum-points-you-can-obtain-from-cards
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1575-maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts
1603-running-sum-of-1d-array
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1631-number-of-sub-arrays-with-odd-sum
1663-detect-cycles-in-2d-grid
1741-sort-array-by-increasing-frequency
1753-path-with-minimum-effort
1776-minimum-operations-to-reduce-x-to-zero
1786-count-the-number-of-consistent-strings
1813-maximum-erasure-value
1819-construct-the-lexicographically-largest-valid-sequence
1849-maximum-absolute-sum-of-any-subarray
1876-map-of-highest-peak
1878-check-if-array-is-sorted-and-rotated
1927-maximum-ascending-subarray-sum
1970-last-day-where-you-can-still-cross
1993-sum-of-all-subset-xor-totals
1995-finding-pairs-with-a-certain-sum
2101-detonate-the-maximum-bombs
2107-find-unique-binary-string
2139-detect-squares
2145-grid-game
2151-the-time-when-the-network-becomes-idle
2155-find-missing-observations
2160-minimum-operations-to-make-a-uni-value-grid
2169-simple-bank-system
2170-count-number-of-maximum-bitwise-or-subsets
2204-find-subsequence-of-length-k-with-the-largest-sum
2220-find-all-possible-recipes-from-given-supplies
2249-count-the-hidden-sequences
2262-solving-questions-with-brainpower
2306-create-binary-tree-from-descriptions
2308-divide-array-into-equal-pairs
2320-find-all-k-distant-indices-in-an-array
2364-longest-path-with-different-adjacent-characters
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
2394-count-subarrays-with-score-less-than-k
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2448-count-number-of-bad-pairs
2465-shifting-letters-ii
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2478-longest-nice-subarray
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers
2519-find-the-original-array-of-prefix-xor
2551-apply-operations-to-an-array
2564-most-profitable-path-in-a-tree
2588-maximum-number-of-points-from-grid-queries
2614-maximum-count-of-positive-integer-and-negative-integer
2618-maximize-the-minimum-powered-city
2665-minimum-time-to-repair-cars
2685-first-completely-painted-row-or-column
2689-rearranging-fruits
2690-house-robber-iv
2691-count-vowel-strings-in-ranges
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2720-minimize-the-maximum-difference-of-pairs
2764-maximum-number-of-fish-in-a-grid
2792-neighboring-bitwise-xor
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
2888-minimum-index-of-a-valid-split
2976-minimum-cost-to-convert-string-i
3142-longest-unequal-adjacent-groups-subsequence-ii
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3219-make-lexicographically-smallest-array-by-swapping-elements
3227-find-missing-and-repeated-values
3241-divide-array-into-arrays-with-max-difference
3332-minimum-operations-to-exceed-threshold-value-ii
3348-minimum-cost-walk-in-weighted-graph
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3428-find-the-xor-of-numbers-which-appear-twice
3429-special-array-i
3434-find-the-number-of-distinct-colors-among-the-balls
3463-alternating-groups-i
3469-maximum-height-of-a-triangle
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3494-minimum-cost-for-cutting-cake-i
3500-minimum-cost-for-cutting-cake-ii
3501-delete-nodes-from-linked-list-present-in-array
3522-find-the-power-of-k-size-subarrays-i
3581-the-two-sneaky-numbers-of-digitville
3616-make-array-elements-equal-to-zero
3621-minimum-operations-to-make-array-values-equal-to-k
3639-zero-array-transformation-i
3643-zero-array-transformation-ii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3657-check-if-grid-can-be-cut-into-sections
3743-reschedule-meetings-for-maximum-free-time-i
3794-find-the-minimum-amount-of-time-to-brew-potions

Prefix Sum

0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0525-contiguous-array
0560-subarray-sum-equals-k
0713-subarray-product-less-than-k
0724-find-pivot-index
0878-shifting-letters
0966-binary-subarrays-with-sum
1016-subarray-sums-divisible-by-k
1037-minimum-number-of-k-consecutive-bit-flips
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1477-product-of-the-last-k-numbers
1537-maximum-score-after-splitting-a-string
1538-maximum-points-you-can-obtain-from-cards
1603-running-sum-of-1d-array
1631-number-of-sub-arrays-with-odd-sum
1776-minimum-operations-to-reduce-x-to-zero
2059-unique-length-3-palindromic-subsequences
2145-grid-game
2249-count-the-hidden-sequences
2394-count-subarrays-with-score-less-than-k
2465-shifting-letters-ii
2483-minimum-penalty-for-a-shop
2618-maximize-the-minimum-powered-city
2691-count-vowel-strings-in-ranges
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3616-make-array-elements-equal-to-zero
3639-zero-array-transformation-i
3643-zero-array-transformation-ii
3794-find-the-minimum-amount-of-time-to-brew-potions

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0017-letter-combinations-of-a-phone-number
0036-valid-sudoku
0037-sudoku-solver
0041-first-missing-positive
0049-group-anagrams
0076-minimum-window-substring
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0126-word-ladder-ii
0127-word-ladder
0128-longest-consecutive-sequence
0133-clone-graph
0139-word-break
0160-intersection-of-two-linked-lists
0166-fraction-to-recurring-decimal
0169-majority-element
0202-happy-number
0219-contains-duplicate-ii
0268-missing-number
0347-top-k-frequent-elements
0355-design-twitter
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0508-most-frequent-subtree-sum
0525-contiguous-array
0532-k-diff-pairs-in-an-array
0560-subarray-sum-equals-k
0567-permutation-in-string
0594-longest-harmonious-subsequence
0621-task-scheduler
0645-set-mismatch
0653-two-sum-iv-input-is-a-bst
0756-pyramid-transition-matrix
0768-partition-labels
0778-reorganize-string
0797-rabbits-in-forest
0835-linked-list-components
0876-hand-of-straights
0893-all-nodes-distance-k-in-binary-tree
0896-smallest-subtree-with-all-the-deepest-nodes
0905-length-of-longest-fibonacci-subsequence
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
0990-verifying-an-alien-dictionary
1016-subarray-sums-divisible-by-k
1024-triples-with-bitwise-and-equal-to-zero
1029-vertical-order-traversal-of-a-binary-tree
1034-subarrays-with-k-different-integers
1055-pairs-of-songs-with-total-durations-divisible-by-60
1160-letter-tile-possibilities
1217-relative-sort-array
1218-lowest-common-ancestor-of-deepest-leaves
1256-rank-transform-of-an-array
1319-unique-number-of-occurrences
1353-find-resultant-array-after-removing-anagrams
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1387-find-elements-in-a-contaminated-binary-tree
1407-group-the-people-given-the-group-size-they-belong-to
1460-number-of-substrings-containing-all-three-characters
1482-how-many-numbers-are-smaller-than-the-current-number
1483-rank-teams-by-votes
1510-find-lucky-integer-in-an-array
1741-sort-array-by-increasing-frequency
1776-minimum-operations-to-reduce-x-to-zero
1786-count-the-number-of-consistent-strings
1813-maximum-erasure-value
1915-check-if-one-string-swap-can-make-strings-equal
1995-finding-pairs-with-a-certain-sum
2059-unique-length-3-palindromic-subsequences
2107-find-unique-binary-string
2139-detect-squares
2169-simple-bank-system
2204-find-subsequence-of-length-k-with-the-largest-sum
2220-find-all-possible-recipes-from-given-supplies
2306-create-binary-tree-from-descriptions
2308-divide-array-into-equal-pairs
2434-design-a-number-container-system
2448-count-number-of-bad-pairs
2461-amount-of-time-for-binary-tree-to-be-infected
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2605-count-anagrams
2677-cousins-in-binary-tree-ii
2685-first-completely-painted-row-or-column
2689-rearranging-fruits
2707-merge-two-2d-arrays-by-summing-values
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
3227-find-missing-and-repeated-values
3360-minimum-deletions-to-make-string-k-special
3428-find-the-xor-of-numbers-which-appear-twice
3434-find-the-number-of-distinct-colors-among-the-balls
3455-minimum-length-of-string-after-operations
3501-delete-nodes-from-linked-list-present-in-array
3581-the-two-sneaky-numbers-of-digitville
3621-minimum-operations-to-make-array-values-equal-to-k
3629-total-characters-in-string-after-transformations-i
3656-minimum-number-of-operations-to-make-elements-in-array-distinct

Divide and Conquer

0004-median-of-two-sorted-arrays
0023-merge-k-sorted-lists
0053-maximum-subarray
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0109-convert-sorted-list-to-binary-search-tree
0169-majority-element
0190-reverse-bits
0191-number-of-1-bits
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0954-maximum-sum-circular-subarray
1014-k-closest-points-to-origin

Sorting

0015-3sum
0016-3sum-closest
0047-permutations-ii
0049-group-anagrams
0056-merge-intervals
0088-merge-sorted-array
0164-maximum-gap
0169-majority-element
0215-kth-largest-element-in-an-array
0268-missing-number
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0368-largest-divisible-subset
0435-non-overlapping-intervals
0462-minimum-moves-to-equal-array-elements-ii
0532-k-diff-pairs-in-an-array
0594-longest-harmonious-subsequence
0621-task-scheduler
0645-set-mismatch
0658-find-k-closest-elements
0778-reorganize-string
0876-hand-of-straights
0917-boats-to-save-people
1014-k-closest-points-to-origin
1019-squares-of-a-sorted-array
1029-vertical-order-traversal-of-a-binary-tree
1217-relative-sort-array
1256-rank-transform-of-an-array
1353-find-resultant-array-after-removing-anagrams
1478-maximum-number-of-events-that-can-be-attended
1482-how-many-numbers-are-smaller-than-the-current-number
1483-rank-teams-by-votes
1575-maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1741-sort-array-by-increasing-frequency
2160-minimum-operations-to-make-a-uni-value-grid
2204-find-subsequence-of-length-k-with-the-largest-sum
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers
2588-maximum-number-of-points-from-grid-queries
2689-rearranging-fruits
2699-count-the-number-of-fair-pairs
2888-minimum-index-of-a-valid-split
3219-make-lexicographically-smallest-array-by-swapping-elements
3241-divide-array-into-arrays-with-max-difference
3360-minimum-deletions-to-make-string-k-special
3494-minimum-cost-for-cutting-cake-i
3500-minimum-cost-for-cutting-cake-ii
3657-check-if-grid-can-be-cut-into-sections

Counting

0169-majority-element
0347-top-k-frequent-elements
0594-longest-harmonious-subsequence
0621-task-scheduler
0778-reorganize-string
1034-subarrays-with-k-different-integers
1055-pairs-of-songs-with-total-durations-divisible-by-60
1160-letter-tile-possibilities
1364-tuple-with-same-product
1396-count-servers-that-communicate
1483-rank-teams-by-votes
1510-find-lucky-integer-in-an-array
1786-count-the-number-of-consistent-strings
1915-check-if-one-string-swap-can-make-strings-equal
2139-detect-squares
2308-divide-array-into-equal-pairs
2448-count-number-of-bad-pairs
2605-count-anagrams
2614-maximum-count-of-positive-integer-and-negative-integer
3360-minimum-deletions-to-make-string-k-special
3455-minimum-length-of-string-after-operations
3629-total-characters-in-string-after-transformations-i

Two Pointers

0011-container-with-most-water
0015-3sum
0016-3sum-closest
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0042-trapping-rain-water
0061-rotate-list
0088-merge-sorted-array
0125-valid-palindrome
0143-reorder-list
0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0202-happy-number
0234-palindrome-linked-list
0283-move-zeroes
0287-find-the-duplicate-number
0295-find-median-from-data-stream
0532-k-diff-pairs-in-an-array
0567-permutation-in-string
0647-palindromic-substrings
0653-two-sum-iv-input-is-a-bst
0658-find-k-closest-elements
0768-partition-labels
0908-middle-of-the-linked-list
0917-boats-to-save-people
0979-di-string-match
1019-squares-of-a-sorted-array
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1894-merge-strings-alternately
2216-delete-the-middle-node-of-a-linked-list
2320-find-all-k-distant-indices-in-an-array
2392-successful-pairs-of-spells-and-potions
2497-maximum-matching-of-players-with-trainers
2551-apply-operations-to-an-array
2588-maximum-number-of-points-from-grid-queries
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
3195-separate-black-and-white-balls
3683-find-the-lexicographically-largest-string-from-the-box-i

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0209-minimum-size-subarray-sum
0219-contains-duplicate-ii
0239-sliding-window-maximum
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0567-permutation-in-string
0594-longest-harmonious-subsequence
0658-find-k-closest-elements
0713-subarray-product-less-than-k
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1037-minimum-number-of-k-consecutive-bit-flips
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1776-minimum-operations-to-reduce-x-to-zero
1813-maximum-erasure-value
2394-count-subarrays-with-score-less-than-k
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2478-longest-nice-subarray
2618-maximize-the-minimum-powered-city
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
3463-alternating-groups-i
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3522-find-the-power-of-k-size-subarrays-i
3743-reschedule-meetings-for-maximum-free-time-i

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0048-rotate-image
0050-powx-n
0062-unique-paths
0066-plus-one
0067-add-binary
0070-climbing-stairs
0089-gray-code
0166-fraction-to-recurring-decimal
0172-factorial-trailing-zeroes
0189-rotate-array
0202-happy-number
0231-power-of-two
0268-missing-number
0282-expression-add-operators
0368-largest-divisible-subset
0415-add-strings
0462-minimum-moves-to-equal-array-elements-ii
0507-perfect-number
0728-self-dividing-numbers
0797-rabbits-in-forest
1013-fibonacci-number
1014-k-closest-points-to-origin
1031-add-to-array-form-of-integer
1370-count-number-of-nice-subarrays
1411-convert-binary-number-in-a-linked-list-to-integer
1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
1889-check-if-number-is-a-sum-of-powers-of-three
1993-sum-of-all-subset-xor-totals
2101-detonate-the-maximum-bombs
2147-number-of-ways-to-divide-a-long-corridor
2155-find-missing-observations
2160-minimum-operations-to-make-a-uni-value-grid
2202-sum-of-k-mirror-numbers
2448-count-number-of-bad-pairs
2575-minimum-cuts-to-divide-a-circle
2605-count-anagrams
2610-closest-prime-numbers-in-range
2649-count-total-number-of-colored-cells
2704-maximum-difference-by-remapping-a-digit
2802-find-the-punishment-number-of-an-integer
2998-count-symmetric-integers
3227-find-missing-and-repeated-values
3243-count-the-number-of-powerful-integers
3336-water-bottles-ii
3581-the-two-sneaky-numbers-of-digitville
3601-find-the-k-th-character-in-string-game-ii
3629-total-characters-in-string-after-transformations-i
3768-check-if-digits-are-equal-in-string-after-operations-i

Matrix

0036-valid-sudoku
0037-sudoku-solver
0048-rotate-image
0054-spiral-matrix
0063-unique-paths-ii
0064-minimum-path-sum
0074-search-a-2d-matrix
0079-word-search
0130-surrounded-regions
0200-number-of-islands
0417-pacific-atlantic-water-flow
0463-island-perimeter
0542-01-matrix
0695-max-area-of-island
0733-flood-fill
0750-contain-virus
0854-making-a-large-island
0945-snakes-and-ladders
1036-rotting-oranges
1073-number-of-enclaves
1171-shortest-path-in-binary-matrix
1396-count-servers-that-communicate
1663-detect-cycles-in-2d-grid
1753-path-with-minimum-effort
1876-map-of-highest-peak
1970-last-day-where-you-can-still-cross
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2588-maximum-number-of-points-from-grid-queries
2685-first-completely-painted-row-or-column
2764-maximum-number-of-fish-in-a-grid
3227-find-missing-and-repeated-values

Binary Search

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0074-search-a-2d-matrix
0153-find-minimum-in-rotated-sorted-array
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
0222-count-complete-tree-nodes
0268-missing-number
0287-find-the-duplicate-number
0532-k-diff-pairs-in-an-array
0658-find-k-closest-elements
0713-subarray-product-less-than-k
0792-binary-search
0907-koko-eating-bananas
1046-max-consecutive-ones-iii
1335-maximum-candies-allocated-to-k-children
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1753-path-with-minimum-effort
1776-minimum-operations-to-reduce-x-to-zero
1970-last-day-where-you-can-still-cross
2392-successful-pairs-of-spells-and-potions
2394-count-subarrays-with-score-less-than-k
2614-maximum-count-of-positive-integer-and-negative-integer
2618-maximize-the-minimum-powered-city
2665-minimum-time-to-repair-cars
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
2720-minimize-the-maximum-difference-of-pairs
3643-zero-array-transformation-ii

Bit Manipulation

0067-add-binary
0078-subsets
0089-gray-code
0090-subsets-ii
0136-single-number
0137-single-number-ii
0190-reverse-bits
0191-number-of-1-bits
0222-count-complete-tree-nodes
0231-power-of-two
0260-single-number-iii
0268-missing-number
0287-find-the-duplicate-number
0338-counting-bits
0645-set-mismatch
0756-pyramid-transition-matrix
1024-triples-with-bitwise-and-equal-to-zero
1037-minimum-number-of-k-consecutive-bit-flips
1786-count-the-number-of-consistent-strings
1993-sum-of-all-subset-xor-totals
2059-unique-length-3-palindromic-subsequences
2170-count-number-of-maximum-bitwise-or-subsets
2308-divide-array-into-equal-pairs
2323-minimum-bit-flips-to-convert-number
2478-longest-nice-subarray
2519-find-the-original-array-of-prefix-xor
2659-number-of-even-and-odd-bits
2792-neighboring-bitwise-xor
3348-minimum-cost-walk-in-weighted-graph
3428-find-the-xor-of-numbers-which-appear-twice
3453-generate-binary-strings-without-adjacent-zeros
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3601-find-the-k-th-character-in-string-game-ii

Simulation

0054-spiral-matrix
0067-add-binary
0415-add-strings
0750-contain-virus
1667-find-kth-bit-in-nth-binary-string
2021-remove-all-occurrences-of-a-substring
2155-find-missing-observations
2169-simple-bank-system
2299-merge-nodes-in-between-zeros
2479-meeting-rooms-iii
2551-apply-operations-to-an-array
3332-minimum-operations-to-exceed-threshold-value-ii
3336-water-bottles-ii
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3616-make-array-elements-equal-to-zero
3768-check-if-digits-are-equal-in-string-after-operations-i
3794-find-the-minimum-amount-of-time-to-brew-potions

Greedy

0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0135-candy
0435-non-overlapping-intervals
0621-task-scheduler
0768-partition-labels
0778-reorganize-string
0797-rabbits-in-forest
0876-hand-of-straights
0917-boats-to-save-people
0979-di-string-match
1407-group-the-people-given-the-group-size-they-belong-to
1478-maximum-number-of-events-that-can-be-attended
1575-maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts
1818-maximum-score-from-removing-substrings
2387-partition-array-such-that-maximum-difference-is-k
2456-construct-smallest-number-from-di-string
2497-maximum-matching-of-players-with-trainers
2618-maximize-the-minimum-powered-city
2689-rearranging-fruits
2704-maximum-difference-by-remapping-a-digit
2720-minimize-the-maximum-difference-of-pairs
3171-minimum-equal-sum-of-two-arrays-after-replacing-zeros
3195-separate-black-and-white-balls
3241-divide-array-into-arrays-with-max-difference
3360-minimum-deletions-to-make-string-k-special
3484-lexicographically-smallest-string-after-a-swap
3494-minimum-cost-for-cutting-cake-i
3500-minimum-cost-for-cutting-cake-ii
3743-reschedule-meetings-for-maximum-free-time-i

Dynamic Programming

0022-generate-parentheses
0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0062-unique-paths
0063-unique-paths-ii
0064-minimum-path-sum
0070-climbing-stairs
0120-triangle
0122-best-time-to-buy-and-sell-stock-ii
0124-binary-tree-maximum-path-sum
0131-palindrome-partitioning
0139-word-break
0198-house-robber
0322-coin-change
0338-counting-bits
0368-largest-divisible-subset
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0474-ones-and-zeroes
0516-longest-palindromic-subsequence
0542-01-matrix
0647-palindromic-substrings
0747-min-cost-climbing-stairs
0803-cheapest-flights-within-k-stops
0905-length-of-longest-fibonacci-subsequence
0954-maximum-sum-circular-subarray
1013-fibonacci-number
1111-minimum-score-triangulation-of-polygon
1143-longest-common-subsequence
1170-shortest-common-supersequence
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1631-number-of-sub-arrays-with-odd-sum
1849-maximum-absolute-sum-of-any-subarray
2090-number-of-ways-to-arrive-at-destination
2147-number-of-ways-to-divide-a-long-corridor
2262-solving-questions-with-brainpower
2435-paths-in-matrix-whose-sum-is-divisible-by-k
3142-longest-unequal-adjacent-groups-subsequence-ii
3243-count-the-number-of-powerful-integers
3490-find-the-maximum-length-of-valid-subsequence-i
3491-find-the-maximum-length-of-valid-subsequence-ii
3494-minimum-cost-for-cutting-cake-i
3629-total-characters-in-string-after-transformations-i

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0047-permutations-ii
0051-n-queens
0052-n-queens-ii
0077-combinations
0078-subsets
0079-word-search
0089-gray-code
0090-subsets-ii
0093-restore-ip-addresses
0113-path-sum-ii
0126-word-ladder-ii
0131-palindrome-partitioning
0216-combination-sum-iii
0257-binary-tree-paths
0282-expression-add-operators
0756-pyramid-transition-matrix
1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1819-construct-the-lexicographically-largest-valid-sequence
1976-splitting-a-string-into-descending-consecutive-values
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2170-count-number-of-maximum-bitwise-or-subsets
2456-construct-smallest-number-from-di-string
2802-find-the-punishment-number-of-an-integer
3453-generate-binary-strings-without-adjacent-zeros

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0050-powx-n
0143-reorder-list
0206-reverse-linked-list
0231-power-of-two
0234-palindrome-linked-list
1013-fibonacci-number
1667-find-kth-bit-in-nth-binary-string
3601-find-the-k-th-character-in-string-game-ii

String

0003-longest-substring-without-repeating-characters
0008-string-to-integer-atoi
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0038-count-and-say
0049-group-anagrams
0067-add-binary
0076-minimum-window-substring
0079-word-search
0093-restore-ip-addresses
0125-valid-palindrome
0126-word-ladder-ii
0127-word-ladder
0131-palindrome-partitioning
0139-word-break
0166-fraction-to-recurring-decimal
0257-binary-tree-paths
0282-expression-add-operators
0297-serialize-and-deserialize-binary-tree
0415-add-strings
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0474-ones-and-zeroes
0516-longest-palindromic-subsequence
0567-permutation-in-string
0606-construct-string-from-binary-tree
0647-palindromic-substrings
0756-pyramid-transition-matrix
0768-partition-labels
0778-reorganize-string
0878-shifting-letters
0979-di-string-match
0990-verifying-an-alien-dictionary
1058-lexicographically-smallest-equivalent-string
1093-recover-a-tree-from-preorder-traversal
1143-longest-common-subsequence
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1350-remove-sub-folders-from-the-filesystem
1353-find-resultant-array-after-removing-anagrams
1460-number-of-substrings-containing-all-three-characters
1483-rank-teams-by-votes
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1537-maximum-score-after-splitting-a-string
1667-find-kth-bit-in-nth-binary-string
1786-count-the-number-of-consistent-strings
1818-maximum-score-from-removing-substrings
1894-merge-strings-alternately
1915-check-if-one-string-swap-can-make-strings-equal
1976-splitting-a-string-into-descending-consecutive-values
2021-remove-all-occurrences-of-a-substring
2059-unique-length-3-palindromic-subsequences
2107-find-unique-binary-string
2147-number-of-ways-to-divide-a-long-corridor
2220-find-all-possible-recipes-from-given-supplies
2364-longest-path-with-different-adjacent-characters
2456-construct-smallest-number-from-di-string
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2465-shifting-letters-ii
2483-minimum-penalty-for-a-shop
2605-count-anagrams
2691-count-vowel-strings-in-ranges
2976-minimum-cost-to-convert-string-i
3142-longest-unequal-adjacent-groups-subsequence-ii
3195-separate-black-and-white-balls
3243-count-the-number-of-powerful-integers
3360-minimum-deletions-to-make-string-k-special
3447-clear-digits
3453-generate-binary-strings-without-adjacent-zeros
3455-minimum-length-of-string-after-operations
3468-find-the-encrypted-string
3484-lexicographically-smallest-string-after-a-swap
3629-total-characters-in-string-after-transformations-i
3683-find-the-lexicographically-largest-string-from-the-box-i
3768-check-if-digits-are-equal-in-string-after-operations-i

Memoization

0070-climbing-stairs
0139-word-break
1013-fibonacci-number

Bucket Sort

0164-maximum-gap
0347-top-k-frequent-elements

Radix Sort

0164-maximum-gap

Counting Sort

1217-relative-sort-array
1482-how-many-numbers-are-smaller-than-the-current-number

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0025-reverse-nodes-in-k-group
0061-rotate-list
0109-convert-sorted-list-to-binary-search-tree
0114-flatten-binary-tree-to-linked-list
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0143-reorder-list
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0355-design-twitter
0835-linked-list-components
0908-middle-of-the-linked-list
1411-convert-binary-number-in-a-linked-list-to-integer
2216-delete-the-middle-node-of-a-linked-list
2299-merge-nodes-in-between-zeros
3501-delete-nodes-from-linked-list-present-in-array

Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0107-binary-tree-level-order-traversal-ii
0109-convert-sorted-list-to-binary-search-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0113-path-sum-ii
0114-flatten-binary-tree-to-linked-list
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0129-sum-root-to-leaf-numbers
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0404-sum-of-left-leaves
0437-path-sum-iii
0450-delete-node-in-a-bst
0508-most-frequent-subtree-sum
0513-find-bottom-left-tree-value
0515-find-largest-value-in-each-tree-row
0530-minimum-absolute-difference-in-bst
0538-convert-bst-to-greater-tree
0543-diameter-of-binary-tree
0572-subtree-of-another-tree
0606-construct-string-from-binary-tree
0623-add-one-row-to-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0669-trim-a-binary-search-tree
0687-longest-univalue-path
0764-n-ary-tree-level-order-traversal
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0893-all-nodes-distance-k-in-binary-tree
0896-smallest-subtree-with-all-the-deepest-nodes
0904-leaf-similar-trees
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0993-cousins-in-binary-tree
0998-check-completeness-of-a-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1050-construct-binary-search-tree-from-preorder-traversal
1093-recover-a-tree-from-preorder-traversal
1114-binary-search-tree-to-greater-sum-tree
1116-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1492-time-needed-to-inform-all-employees
1544-count-good-nodes-in-binary-tree
2306-create-binary-tree-from-descriptions
2364-longest-path-with-different-adjacent-characters
2461-amount-of-time-for-binary-tree-to-be-infected
2493-reverse-odd-levels-of-binary-tree
2564-most-profitable-path-in-a-tree
2677-cousins-in-binary-tree-ii

Depth-First Search

0079-word-search
0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0113-path-sum-ii
0114-flatten-binary-tree-to-linked-list
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0129-sum-root-to-leaf-numbers
0130-surrounded-regions
0133-clone-graph
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0386-lexicographical-numbers
0404-sum-of-left-leaves
0417-pacific-atlantic-water-flow
0437-path-sum-iii
0463-island-perimeter
0508-most-frequent-subtree-sum
0513-find-bottom-left-tree-value
0515-find-largest-value-in-each-tree-row
0530-minimum-absolute-difference-in-bst
0538-convert-bst-to-greater-tree
0543-diameter-of-binary-tree
0547-number-of-provinces
0572-subtree-of-another-tree
0606-construct-string-from-binary-tree
0623-add-one-row-to-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0669-trim-a-binary-search-tree
0684-redundant-connection
0687-longest-univalue-path
0695-max-area-of-island
0733-flood-fill
0744-network-delay-time
0750-contain-virus
0801-is-graph-bipartite
0803-cheapest-flights-within-k-stops
0820-find-eventual-safe-states
0854-making-a-large-island
0881-loud-and-rich
0893-all-nodes-distance-k-in-binary-tree
0896-smallest-subtree-with-all-the-deepest-nodes
0904-leaf-similar-trees
0993-cousins-in-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1073-number-of-enclaves
1093-recover-a-tree-from-preorder-traversal
1114-binary-search-tree-to-greater-sum-tree
1116-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1350-remove-sub-folders-from-the-filesystem
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1442-number-of-operations-to-make-network-connected
1492-time-needed-to-inform-all-employees
1544-count-good-nodes-in-binary-tree
1558-course-schedule-iv
1663-detect-cycles-in-2d-grid
1753-path-with-minimum-effort
1970-last-day-where-you-can-still-cross
2101-detonate-the-maximum-bombs
2246-maximum-employees-to-be-invited-to-a-meeting
2364-longest-path-with-different-adjacent-characters
2439-longest-cycle-in-a-graph
2461-amount-of-time-for-binary-tree-to-be-infected
2493-reverse-odd-levels-of-binary-tree
2564-most-profitable-path-in-a-tree
2677-cousins-in-binary-tree-ii
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii
0111-minimum-depth-of-binary-tree
0112-path-sum
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0126-word-ladder-ii
0127-word-ladder
0130-surrounded-regions
0133-clone-graph
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0297-serialize-and-deserialize-binary-tree
0322-coin-change
0404-sum-of-left-leaves
0417-pacific-atlantic-water-flow
0463-island-perimeter
0513-find-bottom-left-tree-value
0515-find-largest-value-in-each-tree-row
0530-minimum-absolute-difference-in-bst
0542-01-matrix
0547-number-of-provinces
0623-add-one-row-to-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0684-redundant-connection
0695-max-area-of-island
0733-flood-fill
0744-network-delay-time
0750-contain-virus
0764-n-ary-tree-level-order-traversal
0801-is-graph-bipartite
0803-cheapest-flights-within-k-stops
0820-find-eventual-safe-states
0854-making-a-large-island
0893-all-nodes-distance-k-in-binary-tree
0896-smallest-subtree-with-all-the-deepest-nodes
0945-snakes-and-ladders
0993-cousins-in-binary-tree
0998-check-completeness-of-a-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1036-rotting-oranges
1073-number-of-enclaves
1116-maximum-level-sum-of-a-binary-tree
1171-shortest-path-in-binary-matrix
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1424-maximum-candies-you-can-get-from-boxes
1442-number-of-operations-to-make-network-connected
1492-time-needed-to-inform-all-employees
1544-count-good-nodes-in-binary-tree
1558-course-schedule-iv
1663-detect-cycles-in-2d-grid
1753-path-with-minimum-effort
1876-map-of-highest-peak
1970-last-day-where-you-can-still-cross
2101-detonate-the-maximum-bombs
2151-the-time-when-the-network-becomes-idle
2439-longest-cycle-in-a-graph
2461-amount-of-time-for-binary-tree-to-be-infected
2493-reverse-odd-levels-of-binary-tree
2564-most-profitable-path-in-a-tree
2583-divide-nodes-into-the-maximum-number-of-groups
2588-maximum-number-of-points-from-grid-queries
2677-cousins-in-binary-tree-ii
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components

Binary Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0107-binary-tree-level-order-traversal-ii
0109-convert-sorted-list-to-binary-search-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0113-path-sum-ii
0114-flatten-binary-tree-to-linked-list
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0124-binary-tree-maximum-path-sum
0129-sum-root-to-leaf-numbers
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0404-sum-of-left-leaves
0437-path-sum-iii
0450-delete-node-in-a-bst
0508-most-frequent-subtree-sum
0513-find-bottom-left-tree-value
0515-find-largest-value-in-each-tree-row
0530-minimum-absolute-difference-in-bst
0538-convert-bst-to-greater-tree
0543-diameter-of-binary-tree
0572-subtree-of-another-tree
0606-construct-string-from-binary-tree
0623-add-one-row-to-tree
0653-two-sum-iv-input-is-a-bst
0662-maximum-width-of-binary-tree
0669-trim-a-binary-search-tree
0687-longest-univalue-path
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0893-all-nodes-distance-k-in-binary-tree
0896-smallest-subtree-with-all-the-deepest-nodes
0904-leaf-similar-trees
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0993-cousins-in-binary-tree
0998-check-completeness-of-a-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1050-construct-binary-search-tree-from-preorder-traversal
1093-recover-a-tree-from-preorder-traversal
1114-binary-search-tree-to-greater-sum-tree
1116-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1544-count-good-nodes-in-binary-tree
2306-create-binary-tree-from-descriptions
2461-amount-of-time-for-binary-tree-to-be-infected
2493-reverse-odd-levels-of-binary-tree
2677-cousins-in-binary-tree-ii

Binary Search Tree

0098-validate-binary-search-tree
0109-convert-sorted-list-to-binary-search-tree
0173-binary-search-tree-iterator
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0450-delete-node-in-a-bst
0530-minimum-absolute-difference-in-bst
0538-convert-bst-to-greater-tree
0653-two-sum-iv-input-is-a-bst
0669-trim-a-binary-search-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
1050-construct-binary-search-tree-from-preorder-traversal
1114-binary-search-tree-to-greater-sum-tree

Queue

0239-sliding-window-maximum
0954-maximum-sum-circular-subarray
1037-minimum-number-of-k-consecutive-bit-flips
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2618-maximize-the-minimum-powered-city
2868-continuous-subarrays
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Monotonic Queue

0239-sliding-window-maximum
0954-maximum-sum-circular-subarray
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2868-continuous-subarrays

Stack

0042-trapping-rain-water
0094-binary-tree-inorder-traversal
0114-flatten-binary-tree-to-linked-list
0143-reorder-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0234-palindrome-linked-list
1050-construct-binary-search-tree-from-preorder-traversal
1818-maximum-score-from-removing-substrings
2021-remove-all-occurrences-of-a-substring
2456-construct-smallest-number-from-di-string
3447-clear-digits

Monotonic Stack

0042-trapping-rain-water
1050-construct-binary-search-tree-from-preorder-traversal

Heap (Priority Queue)

0023-merge-k-sorted-lists
0215-kth-largest-element-in-an-array
0239-sliding-window-maximum
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0355-design-twitter
0621-task-scheduler
0658-find-k-closest-elements
0744-network-delay-time
0778-reorganize-string
0789-kth-largest-element-in-a-stream
0803-cheapest-flights-within-k-stops
1014-k-closest-points-to-origin
1127-last-stone-weight
1478-maximum-number-of-events-that-can-be-attended
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1753-path-with-minimum-effort
2204-find-subsequence-of-length-k-with-the-largest-sum
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2588-maximum-number-of-points-from-grid-queries
2868-continuous-subarrays
3332-minimum-operations-to-exceed-threshold-value-ii

Merge Sort

0023-merge-k-sorted-lists

Union Find

0128-longest-consecutive-sequence
0130-surrounded-regions
0200-number-of-islands
0547-number-of-provinces
0684-redundant-connection
0695-max-area-of-island
0801-is-graph-bipartite
0854-making-a-large-island
1058-lexicographically-smallest-equivalent-string
1073-number-of-enclaves
1396-count-servers-that-communicate
1442-number-of-operations-to-make-network-connected
1663-detect-cycles-in-2d-grid
1753-path-with-minimum-effort
1970-last-day-where-you-can-still-cross
2583-divide-nodes-into-the-maximum-number-of-groups
2588-maximum-number-of-points-from-grid-queries
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3219-make-lexicographically-smallest-array-by-swapping-elements
3348-minimum-cost-walk-in-weighted-graph

Graph

0133-clone-graph
0207-course-schedule
0210-course-schedule-ii
0547-number-of-provinces
0684-redundant-connection
0744-network-delay-time
0801-is-graph-bipartite
0803-cheapest-flights-within-k-stops
0820-find-eventual-safe-states
0881-loud-and-rich
1424-maximum-candies-you-can-get-from-boxes
1442-number-of-operations-to-make-network-connected
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1558-course-schedule-iv
2090-number-of-ways-to-arrive-at-destination
2101-detonate-the-maximum-bombs
2151-the-time-when-the-network-becomes-idle
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting
2364-longest-path-with-different-adjacent-characters
2439-longest-cycle-in-a-graph
2564-most-profitable-path-in-a-tree
2583-divide-nodes-into-the-maximum-number-of-groups
2793-count-the-number-of-complete-components
2976-minimum-cost-to-convert-string-i
3348-minimum-cost-walk-in-weighted-graph

Topological Sort

0207-course-schedule
0210-course-schedule-ii
0820-find-eventual-safe-states
0881-loud-and-rich
1558-course-schedule-iv
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting
2364-longest-path-with-different-adjacent-characters
2439-longest-cycle-in-a-graph

Combinatorics

0062-unique-paths
1993-sum-of-all-subset-xor-totals
2605-count-anagrams
3768-check-if-digits-are-equal-in-string-after-operations-i

Enumeration

1976-splitting-a-string-into-descending-consecutive-values
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2202-sum-of-k-mirror-numbers
2998-count-symmetric-integers
3469-maximum-height-of-a-triangle
3683-find-the-lexicographically-largest-string-from-the-box-i

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
1014-k-closest-points-to-origin

Design

0173-binary-search-tree-iterator
0295-find-median-from-data-stream
0297-serialize-and-deserialize-binary-tree
0355-design-twitter
0789-kth-largest-element-in-a-stream
1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers
1995-finding-pairs-with-a-certain-sum
2139-detect-squares
2169-simple-bank-system
2434-design-a-number-container-system

Ordered Set

1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2434-design-a-number-container-system
2868-continuous-subarrays

Data Stream

0295-find-median-from-data-stream
0789-kth-largest-element-in-a-stream
1477-product-of-the-last-k-numbers

Geometry

1014-k-closest-points-to-origin
2101-detonate-the-maximum-bombs
2575-minimum-cuts-to-divide-a-circle

Number Theory

2610-closest-prime-numbers-in-range
3768-check-if-digits-are-equal-in-string-after-operations-i

Trie

0014-longest-common-prefix
0139-word-break
0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
1350-remove-sub-folders-from-the-filesystem

String Matching

0572-subtree-of-another-tree

Hash Function

0572-subtree-of-another-tree

Iterator

0173-binary-search-tree-iterator

Shortest Path

0744-network-delay-time
0803-cheapest-flights-within-k-stops
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
2090-number-of-ways-to-arrive-at-destination
2976-minimum-cost-to-convert-string-i

Database

0183-customers-who-never-order
0570-managers-with-at-least-5-direct-reports