LeetCode LeetCode Problems' Solutions [力扣 ∙ 话题分类] [1-50] [51-100] [101-150] [151-200] [201-250] [251-300] [301-350] [351-400] [401-450] [451-500] [501-550] [551-600] [601-650] [651-700] [701-750] [751-800] [801-850] [851-900] [901-950] [951-1000] [1001-1050] [1051-1100] [1101-1150] [1151-1200] [1201-1250] [1251-1300] [1301-1350] [1351-1400] [1401-1450] [1451-1500] [1501-1550] [1551-1600] [1601-1650] [1651-1700] [1701-1750] [1751-1800] [1801-1850] [1851-1900] [1901-1950] [1951-2000] [2001-2050] [2051-2100] [2101-2150] [2151-2200] [2201-2250] [2251-2300] [2301-2350] [2351-2400] # Title Solution Difficulty 2173 Longest Winning Streak 🔒 MySQL Hard 2172 Maximum AND Sum of Array Go Hard 2171 Removing Minimum Number of Magic Beans Go Medium 2170 Minimum Operations to Make the Array Alternating Go Medium 2169 Count Operations to Obtain Zero Go Easy 2168 Unique Substrings With Equal Digit Frequency 🔒 Go Medium 2167 Minimum Time to Remove All Cars Containing Illegal Goods Go Hard 2166 Design Bitset Go Medium 2165 Smallest Value of the Rearranged Number Go Medium 2164 Sort Even and Odd Indices Independently Go Easy 2163 Minimum Difference in Sums After Removal of Elements Go Hard 2162 Minimum Cost to Set Cooking Time Go Medium 2161 Partition Array According to Given Pivot Go Medium 2160 Minimum Sum of Four Digit Number After Splitting Digits Go Easy 2159 Order Two Columns Independently 🔒 MySQL Medium 2158 Amount of New Area Painted Each Day 🔒 Go Hard 2157 Groups of Strings Go Hard 2156 Find Substring With Given Hash Value Go Hard 2155 All Divisions With the Highest Score of a Binary Array Go Medium 2154 Keep Multiplying Found Values by Two Go Easy 2153 The Number of Passengers in Each Bus II 🔒 MySQL Hard 2152 Minimum Number of Lines to Cover Points 🔒 Go Medium 2151 Maximum Good People Based on Statements Go Hard 2150 Find All Lonely Numbers in the Array Go Medium 2149 Rearrange Array Elements by Sign Go Medium 2148 Count Elements With Strictly Smaller and Greater Elements Go Easy 2147 Number of Ways to Divide a Long Corridor Go Hard 2146 K Highest Ranked Items Within a Price Range Go Medium 2145 Count the Hidden Sequences Go Medium 2144 Minimum Cost of Buying Candies With Discount Go Easy 2143 Choose Numbers From Two Arrays in Range 🔒 Go Hard 2142 The Number of Passengers in Each Bus I 🔒 MySQL Medium 2141 Maximum Running Time of N Computers Go Hard 2140 Solving Questions With Brainpower Go Medium 2139 Minimum Moves to Reach Target Score Go Medium 2138 Divide a String Into Groups of Size k Go Easy 2137 Pour Water Between Buckets to Make Water Levels Equal 🔒 Go Medium 2136 Earliest Possible Day of Full Bloom Go Hard 2135 Count Words Obtained After Adding a Letter Go Medium 2134 Minimum Swaps to Group All 1's Together II Go Medium 2133 Check if Every Row and Column Contains All Numbers Go Easy 2132 Stamping the Grid Go Hard 2131 Longest Palindrome by Concatenating Two Letter Words Go Medium 2130 Maximum Twin Sum of a Linked List Go Medium 2129 Capitalize the Title Go Easy 2128 Remove All Ones With Row and Column Flips 🔒 Go Medium 2127 Maximum Employees to Be Invited to a Meeting Go Hard 2126 Destroying Asteroids Go Medium 2125 Number of Laser Beams in a Bank Go Medium 2124 Check if All A's Appears Before All B's Go Easy 2123 Minimum Operations to Remove Adjacent Ones in Matrix 🔒 Go Hard 2122 Recover the Original Array Go Hard 2121 Intervals Between Identical Elements Go Medium 2120 Execution of All Suffix Instructions Staying in a Grid Go Medium 2119 A Number After a Double Reversal Go Easy 2118 Build the Equation 🔒 MySQL Hard 2117 Abbreviating the Product of a Range Go Hard 2116 Check if a Parentheses String Can Be Valid Go Medium 2115 Find All Possible Recipes from Given Supplies Go Medium 2114 Maximum Number of Words Found in Sentences Go Easy 2113 Elements in Array After Removing and Replacing Elements 🔒 Go Medium 2112 The Airport With the Most Traffic 🔒 MySQL Medium 2111 Minimum Operations to Make the Array K-Increasing Go Hard 2110 Number of Smooth Descent Periods of a Stock Go Medium 2109 Adding Spaces to a String Go Medium 2108 Find First Palindromic String in the Array Go Easy 2107 Number of Unique Flavors After Sharing K Candies 🔒 Go Medium 2106 Maximum Fruits Harvested After at Most K Steps Go Hard 2105 Watering Plants II Go Medium 2104 Sum of Subarray Ranges Go Medium 2103 Rings and Rods Go Easy 2102 Sequentially Ordinal Rank Tracker Go Hard 2101 Detonate the Maximum Bombs Go Medium 2100 Find Good Days to Rob the Bank Go Medium 2099 Find Subsequence of Length K With the Largest Sum Go Easy 2098 Subsequence of Size K With the Largest Even Sum 🔒 Go Medium 2097 Valid Arrangement of Pairs Go Hard 2096 Step-By-Step Directions From a Binary Tree Node to Another Go Medium 2095 Delete the Middle Node of a Linked List Go Medium 2094 Finding 3-Digit Even Numbers Go Easy 2093 Minimum Cost to Reach City With Discounts 🔒 Go Medium 2092 Find All People With Secret Go Hard 2091 Removing Minimum and Maximum From Array Go Medium 2090 K Radius Subarray Averages Go Medium 2089 Find Target Indices After Sorting Array Go Easy 2088 Count Fertile Pyramids in a Land Go Hard 2087 Minimum Cost Homecoming of a Robot in a Grid Go Medium 2086 Minimum Number of Buckets Required to Collect Rainwater from Houses Go Medium 2085 Count Common Words With One Occurrence Go Easy 2084 Drop Type 1 Orders for Customers With Type 0 Orders 🔒 MySQL Medium 2083 Substrings That Begin and End With the Same Letter 🔒 Go Medium 2082 The Number of Rich Customers 🔒 MySQL Easy 2081 Sum of k-Mirror Numbers Go Hard 2080 Range Frequency Queries Go Medium 2079 Watering Plants Go Medium 2078 Two Furthest Houses With Different Colors Go Easy 2077 Paths in Maze That Lead to Same Room 🔒 Go Medium 2076 Process Restricted Friend Requests Go Hard 2075 Decode the Slanted Ciphertext Go Medium 2074 Reverse Nodes in Even Length Groups Go Medium 2073 Time Needed to Buy Tickets Go Easy 2072 The Winner University 🔒 MySQL Easy 2071 Maximum Number of Tasks You Can Assign Go Hard 2070 Most Beautiful Item for Each Query Go Medium 2069 Walking Robot Simulation II Go Medium 2068 Check Whether Two Strings are Almost Equivalent Go Easy 2067 Number of Equal Count Substrings 🔒 Go Medium 2066 Account Balance 🔒 MySQL Medium 2065 Maximum Path Quality of a Graph Go Hard 2064 Minimized Maximum of Products Distributed to Any Store Go Medium 2063 Vowels of All Substrings Go Medium 2062 Count Vowel Substrings of a String Go Easy 2061 Number of Spaces Cleaning Robot Cleaned 🔒 Go Medium 2060 Check if an Original String Exists Given Two Encoded Strings Go Hard 2059 Minimum Operations to Convert Number Go Medium 2058 Find the Minimum and Maximum Number of Nodes Between Critical Points Go Medium 2057 Smallest Index With Equal Value Go Easy 2056 Number of Valid Move Combinations On Chessboard Go Hard 2055 Plates Between Candles Go Medium 2054 Two Best Non-Overlapping Events Go Medium 2053 Kth Distinct String in an Array Go Easy 2052 Minimum Cost to Separate Sentence Into Rows 🔒 Go Medium 2051 The Category of Each Member in the Store 🔒 MySQL Medium 2050 Parallel Courses III Go Hard 2049 Count Nodes With the Highest Score Go Medium 2048 Next Greater Numerically Balanced Number Go Medium 2047 Number of Valid Words in a Sentence Go Easy 2046 Sort Linked List Already Sorted Using Absolute Values 🔒 Go Medium 2045 Second Minimum Time to Reach Destination Go Hard 2044 Count Number of Maximum Bitwise-OR Subsets Go Medium 2043 Simple Bank System Go Medium 2042 Check if Numbers Are Ascending in a Sentence Go Easy 2041 Accepted Candidates From the Interviews 🔒 MySQL Medium 2040 Kth Smallest Product of Two Sorted Arrays Go Hard 2039 The Time When the Network Becomes Idle Go Medium 2038 Remove Colored Pieces if Both Neighbors are the Same Color Go Medium 2037 Minimum Number of Moves to Seat Everyone Go Easy 2036 Maximum Alternating Subarray Sum 🔒 Go Medium 2035 Partition Array Into Two Arrays to Minimize Sum Difference Go Hard 2034 Stock Price Fluctuation Go Medium 2033 Minimum Operations to Make a Uni-Value Grid Go Medium 2032 Two Out of Three Go Easy 2031 Count Subarrays With More Ones Than Zeros 🔒 Go Medium 2030 Smallest K-Length Subsequence With Occurrences of a Letter Go Hard 2029 Stone Game IX Go Medium 2028 Find Missing Observations Go Medium 2027 Minimum Moves to Convert String Go Easy 2026 Low-Quality Problems 🔒 MySQL Easy 2025 Maximum Number of Ways to Partition an Array Go Hard 2024 Maximize the Confusion of an Exam Go Medium 2023 Number of Pairs of Strings With Concatenation Equal to Target Go Medium 2022 Convert 1D Array Into 2D Array Go Easy 2021 Brightest Position on Street 🔒 Go Medium 2020 Number of Accounts That Did Not Stream 🔒 MySQL Medium 2019 The Score of Students Solving Math Expression Go Hard 2018 Check if Word Can Be Placed In Crossword Go Medium 2017 Grid Game Go Medium 2016 Maximum Difference Between Increasing Elements Go Easy 2015 Average Height of Buildings in Each Segment 🔒 Go Medium 2014 Longest Subsequence Repeated k Times Go Hard 2013 Detect Squares Go Medium 2012 Sum of Beauty in the Array Go Medium 2011 Final Value of Variable After Performing Operations Go Easy 2010 The Number of Seniors and Juniors to Join the Company II 🔒 MySQL Hard 2009 Minimum Number of Operations to Make Array Continuous Go Hard 2008 Maximum Earnings From Taxi Go Medium 2007 Find Original Array From Doubled Array Go Medium 2006 Count Number of Pairs With Absolute Difference K Go Easy 2005 Subtree Removal Game with Fibonacci Tree 🔒 Go Hard 2004 The Number of Seniors and Juniors to Join the Company 🔒 MySQL Hard 2003 Smallest Missing Genetic Value in Each Subtree Go Hard 2002 Maximum Product of the Length of Two Palindromic Subsequences Go Medium 2001 Number of Pairs of Interchangeable Rectangles Go Medium 2000 Reverse Prefix of Word Go Easy 1999 Smallest Greater Multiple Made of Two Digits 🔒 Go Medium 1998 GCD Sort of an Array Go Hard 1997 First Day Where You Have Been in All the Rooms Go Medium 1996 The Number of Weak Characters in the Game Go Medium 1995 Count Special Quadruplets Go Easy 1994 The Number of Good Subsets Go Hard 1993 Operations on Tree Go Medium 1992 Find All Groups of Farmland Go Medium 1991 Find the Middle Index in Array Go Easy 1990 Count the Number of Experiments 🔒 MySQL Medium 1989 Maximum Number of People That Can Be Caught in Tag 🔒 Go Medium 1988 Find Cutoff Score for Each School 🔒 MySQL Medium 1987 Number of Unique Good Subsequences Go Hard 1986 Minimum Number of Work Sessions to Finish the Tasks Go Medium 1985 Find the Kth Largest Integer in the Array Go Medium 1984 Minimum Difference Between Highest and Lowest of K Scores Go Easy 1983 Widest Pair of Indices With Equal Range Sum 🔒 Go Medium 1982 Find Array Given Subset Sums Go Hard 1981 Minimize the Difference Between Target and Chosen Elements Go Medium 1980 Find Unique Binary String Go Medium 1979 Find Greatest Common Divisor of Array Go Easy 1978 Employees Whose Manager Left the Company 🔒 MySQL Easy 1977 Number of Ways to Separate Numbers Go Hard 1976 Number of Ways to Arrive at Destination Go Medium 1975 Maximum Matrix Sum Go Medium 1974 Minimum Time to Type Word Using Special Typewriter Go Easy 1973 Count Nodes Equal to Sum of Descendants 🔒 Go Medium 1972 First and Last Call On the Same Day 🔒 MySQL Hard 1971 Find if Path Exists in Graph Go Easy 1970 Last Day Where You Can Still Cross Go Hard 1969 Minimum Non-Zero Product of the Array Elements Go Medium 1968 Array With Elements Not Equal to Average of Neighbors Go Medium 1967 Number of Strings That Appear as Substrings in Word Go Easy 1966 Binary Searchable Numbers in an Unsorted Array 🔒 Go Medium 1965 Employees With Missing Information 🔒 MySQL Easy 1964 Find the Longest Valid Obstacle Course at Each Position Go Hard 1963 Minimum Number of Swaps to Make the String Balanced Go Medium 1962 Remove Stones to Minimize the Total Go Medium 1961 Check If String Is a Prefix of Array Go Easy 1960 Maximum Product of the Length of Two Palindromic Substrings Go Hard 1959 Minimum Total Space Wasted With K Resizing Operations Go Medium 1958 Check if Move is Legal Go Medium 1957 Delete Characters to Make Fancy String Go Easy 1956 Minimum Time For K Virus Variants to Spread 🔒 Go Hard 1955 Count Number of Special Subsequences Go Hard 1954 Minimum Garden Perimeter to Collect Enough Apples Go Medium 1953 Maximum Number of Weeks for Which You Can Work Go Medium 1952 Three Divisors Go Easy 1951 All the Pairs With the Maximum Number of Common Followers 🔒 MySQL Medium 1950 Maximum of Minimum Values in All Subarrays 🔒 Go Medium 1949 Strong Friendship 🔒 MySQL Medium 1948 Delete Duplicate Folders in System Go Hard 1947 Maximum Compatibility Score Sum Go Medium 1946 Largest Number After Mutating Substring Go Medium 1945 Sum of Digits of String After Convert Go Easy 1944 Number of Visible People in a Queue Go Hard 1943 Describe the Painting Go Medium 1942 The Number of the Smallest Unoccupied Chair Go Medium 1941 Check if All Characters Have Equal Number of Occurrences Go Easy 1940 Longest Common Subsequence Between Sorted Arrays 🔒 Go Medium 1939 Users That Actively Request Confirmation Messages 🔒 MySQL Easy 1938 Maximum Genetic Difference Query Go Hard 1937 Maximum Number of Points with Cost Go Medium 1936 Add Minimum Number of Rungs Go Medium 1935 Maximum Number of Words You Can Type Go Easy 1934 Confirmation Rate 🔒 MySQL Medium 1933 Check if String Is Decomposable Into Value-Equal Substrings 🔒 Go Easy 1932 Merge BSTs to Create Single BST Go Hard 1931 Painting a Grid With Three Different Colors Go Hard 1930 Unique Length-3 Palindromic Subsequences Go Medium 1929 Concatenation of Array Go Easy 1928 Minimum Cost to Reach Destination in Time Go Hard 1927 Sum Game Go Medium 1926 Nearest Exit from Entrance in Maze Go Medium 1925 Count Square Sum Triples Go Easy 1924 Erect the Fence II 🔒 Go Hard 1923 Longest Common Subpath Go Hard 1922 Count Good Numbers Go Medium 1921 Eliminate Maximum Number of Monsters Go Medium 1920 Build Array from Permutation Go Easy 1919 Leetcodify Similar Friends 🔒 MySQL Hard 1918 Kth Smallest Subarray Sum 🔒 Go Medium 1917 Leetcodify Friends Recommendations 🔒 MySQL Hard 1916 Count Ways to Build Rooms in an Ant Colony Go Hard 1915 Number of Wonderful Substrings Go Medium 1914 Cyclically Rotating a Grid Go Medium 1913 Maximum Product Difference Between Two Pairs Go Easy 1912 Design Movie Rental System Go Hard 1911 Maximum Alternating Subsequence Sum Go Medium 1910 Remove All Occurrences of a Substring Go Medium 1909 Remove One Element to Make the Array Strictly Increasing Go Easy 1908 Game of Nim 🔒 Go Medium 1907 Count Salary Categories 🔒 MySQL Medium 1906 Minimum Absolute Difference Queries Go Medium 1905 Count Sub Islands Go Medium 1904 The Number of Full Rounds You Have Played Go Medium 1903 Largest Odd Number in String Go Easy 1902 Depth of BST Given Insertion Order 🔒 Go Medium 1901 Find a Peak Element II Go Medium 1900 The Earliest and Latest Rounds Where Players Compete Go Hard 1899 Merge Triplets to Form Target Triplet Go Medium 1898 Maximum Number of Removable Characters Go Medium 1897 Redistribute Characters to Make All Strings Equal Go Easy 1896 Minimum Cost to Change the Final Value of Expression Go Hard 1895 Largest Magic Square Go Medium 1894 Find the Student that Will Replace the Chalk Go Medium 1893 Check if All the Integers in a Range Are Covered Go Easy 1892 Page Recommendations II 🔒 MySQL Hard 1891 Cutting Ribbons 🔒 Go Medium 1890 The Latest Login in 2020 🔒 MySQL Easy 1889 Minimum Space Wasted From Packaging Go Hard 1888 Minimum Number of Flips to Make the Binary String Alternating Go Medium 1887 Reduction Operations to Make the Array Elements Equal Go Medium 1886 Determine Whether Matrix Can Be Obtained By Rotation Go Easy 1885 Count Pairs in Two Arrays 🔒 Go Medium 1884 Egg Drop With 2 Eggs and N Floors Go Medium 1883 Minimum Skips to Arrive at Meeting On Time Go Hard 1882 Process Tasks Using Servers Go Medium 1881 Maximum Value after Insertion Go Medium 1880 Check if Word Equals Summation of Two Words Go Easy 1879 Minimum XOR Sum of Two Arrays Go Hard 1878 Get Biggest Three Rhombus Sums in a Grid Go Medium 1877 Minimize Maximum Pair Sum in Array Go Medium 1876 Substrings of Size Three with Distinct Characters Go Easy 1875 Group Employees of the Same Salary 🔒 MySQL Medium 1874 Minimize Product Sum of Two Arrays 🔒 Go Medium 1873 Calculate Special Bonus 🔒 MySQL Easy 1872 Stone Game VIII Go Hard 1871 Jump Game VII Go Medium 1870 Minimum Speed to Arrive on Time Go Medium 1869 Longer Contiguous Segments of Ones than Zeros Go Easy 1868 Product of Two Run-Length Encoded Arrays 🔒 Go Medium 1867 Orders With Maximum Quantity Above Average 🔒 MySQL Medium 1866 Number of Ways to Rearrange Sticks With K Sticks Visible Go Hard 1865 Finding Pairs With a Certain Sum Go Medium 1864 Minimum Number of Swaps to Make the Binary String Alternating Go Medium 1863 Sum of All Subset XOR Totals Go Easy 1862 Sum of Floored Pairs Go Hard 1861 Rotating the Box Go Medium 1860 Incremental Memory Leak Go Medium 1859 Sorting the Sentence Go Easy 1858 Longest Word With All Prefixes 🔒 Go Medium 1857 Largest Color Value in a Directed Graph Go Hard 1856 Maximum Subarray Min-Product Go Medium 1855 Maximum Distance Between a Pair of Values Go Medium 1854 Maximum Population Year Go Easy 1853 Convert Date Format 🔒 MySQL Easy 1852 Distinct Numbers in Each Subarray 🔒 Go Medium 1851 Minimum Interval to Include Each Query Go Hard 1850 Minimum Adjacent Swaps to Reach the Kth Smallest Number Go Medium 1849 Splitting a String Into Descending Consecutive Values Go Medium 1848 Minimum Distance to the Target Element Go Easy 1847 Closest Room Go Hard 1846 Maximum Element After Decreasing and Rearranging Go Medium 1845 Seat Reservation Manager Go Medium 1844 Replace All Digits with Characters Go Easy 1843 Suspicious Bank Accounts 🔒 MySQL Medium 1842 Next Palindrome Using Same Digits 🔒 Go Hard 1841 League Statistics 🔒 MySQL Medium 1840 Maximum Building Height Go Hard 1839 Longest Substring Of All Vowels in Order Go Medium 1838 Frequency of the Most Frequent Element Go Medium 1837 Sum of Digits in Base K Go Easy 1836 Remove Duplicates From an Unsorted Linked List 🔒 Go Medium 1835 Find XOR Sum of All Pairs Bitwise AND Go Hard 1834 Single-Threaded CPU Go Medium 1833 Maximum Ice Cream Bars Go Medium 1832 Check if the Sentence Is Pangram Go Easy 1831 Maximum Transaction Each Day 🔒 MySQL Medium 1830 Minimum Number of Operations to Make String Sorted Go Hard 1829 Maximum XOR for Each Query Go Medium 1828 Queries on Number of Points Inside a Circle Go Medium 1827 Minimum Operations to Make the Array Increasing Go Easy 1826 Faulty Sensor 🔒 Go Easy 1825 Finding MK Average Go Hard 1824 Minimum Sideway Jumps Go Medium 1823 Find the Winner of the Circular Game Go Medium 1822 Sign of the Product of an Array Go Easy 1821 Find Customers With Positive Revenue this Year 🔒 MySQL Easy 1820 Maximum Number of Accepted Invitations 🔒 Go Medium 1819 Number of Different Subsequences GCDs Go Hard 1818 Minimum Absolute Sum Difference Go Medium 1817 Finding the Users Active Minutes Go Medium 1816 Truncate Sentence Go Easy 1815 Maximum Number of Groups Getting Fresh Donuts Go Hard 1814 Count Nice Pairs in an Array Go Medium 1813 Sentence Similarity III Go Medium 1812 Determine Color of a Chessboard Square Go Easy 1811 Find Interview Candidates 🔒 MySQL Medium 1810 Minimum Path Cost in a Hidden Grid 🔒 Go Medium 1809 Ad-Free Sessions 🔒 MySQL Easy 1808 Maximize Number of Nice Divisors Go Hard 1807 Evaluate the Bracket Pairs of a String Go Medium 1806 Minimum Number of Operations to Reinitialize a Permutation Go Medium 1805 Number of Different Integers in a String Go Easy 1804 Implement Trie II (Prefix Tree) 🔒 Go Medium 1803 Count Pairs With XOR in a Range Go Hard 1802 Maximum Value at a Given Index in a Bounded Array Go Medium 1801 Number of Orders in the Backlog Go Medium
