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ThanhNITThanhNIT
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Updated tags for tasks 206-239
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11 files changed

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-41
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11 files changed

+51
-41
lines changed

‎src/main/go/g0201_0300/s0206_reverse_linked_list/solution.go‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,9 +1,9 @@
11
package s0206_reverse_linked_list
22

33
// #Easy #Top_100_Liked_Questions #Top_Interview_Questions #Linked_List #Recursion
4-
// #Data_Structure_I_Day_8_Linked_List #Algorithm_I_Day_10_Recursion_Backtracking
5-
// #Level_1_Day_3_Linked_List #Udemy_Linked_List #Big_O_Time_O(N)_Space_O(1)
6-
// #2024_03_22_Time_2_ms_(76.97%)_Space_2.7_MB_(21.67%)
4+
// #LeetCode_75_LinkedList #Data_Structure_I_Day_8_Linked_List
5+
// #Algorithm_I_Day_10_Recursion_Backtracking #Level_1_Day_3_Linked_List #Udemy_Linked_List
6+
// #Big_O_Time_O(N)_Space_O(1) #2025_05_09_Time_0_ms_(100.00%)_Space_4.36_MB_(95.25%)
77

88
type ListNode struct {
99
Val int

‎src/main/go/g0201_0300/s0207_course_schedule/solution.go‎

Lines changed: 32 additions & 23 deletions
Original file line numberDiff line numberDiff line change
@@ -2,36 +2,45 @@ package s0207_course_schedule
22

33
// #Medium #Top_100_Liked_Questions #Top_Interview_Questions #Depth_First_Search
44
// #Breadth_First_Search #Graph #Topological_Sort #Top_Interview_150_Graph_General
5-
// #Big_O_Time_O(N)_Space_O(N) #2024_03_22_Time_7_ms_(83.17%)_Space_6.3_MB_(51.07%)
5+
// #Big_O_Time_O(N)_Space_O(N) #2025_05_09_Time_0_ms_(100.00%)_Space_7.98_MB_(72.75%)
6+
7+
type State int
8+
9+
const (
10+
Unvisited State = iota
11+
Visiting
12+
Visited
13+
)
614

715
func canFinish(numCourses int, prerequisites [][]int) bool {
8-
graph := map[int][]int{}
9-
for _, edge := range prerequisites {
10-
graph[edge[1]] = append(graph[edge[1]], edge[0])
16+
visited := make([]State, numCourses)
17+
graph := make([][]int, numCourses)
18+
for _, dep := range prerequisites {
19+
graph[dep[1]] = append(graph[dep[1]], dep[0])
1120
}
12-
indegree := make([]int, numCourses)
13-
queue := []int{}
1421
for i := 0; i < numCourses; i++ {
15-
for _, v := range graph[i] {
16-
indegree[v]++
22+
if visited[i] == Unvisited {
23+
if !dfs(i, visited, graph) {
24+
return false
25+
}
1726
}
1827
}
19-
for i := 0; i < numCourses; i++ {
20-
if indegree[i] == 0 {
21-
queue = append(queue, i)
22-
}
28+
return true
29+
}
30+
31+
func dfs(start int, visited []State, graph [][]int) bool {
32+
if visited[start] == Visiting {
33+
return false
2334
}
24-
visited := 0
25-
for len(queue) > 0 {
26-
node := queue[0]
27-
queue = queue[1:]
28-
visited++
29-
for _, v := range graph[node] {
30-
indegree[v]--
31-
if indegree[v] == 0 {
32-
queue = append(queue, v)
33-
}
35+
if visited[start] == Visited {
36+
return true
37+
}
38+
visited[start] = Visiting
39+
for _, next := range graph[start] {
40+
if !dfs(next, visited, graph) {
41+
return false
3442
}
3543
}
36-
return visited == numCourses
44+
visited[start] = Visited
45+
return true
3746
}

‎src/main/go/g0201_0300/s0208_implement_trie_prefix_tree/trie.go‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,9 +1,9 @@
11
package s0208_implement_trie_prefix_tree
22

33
// #Medium #Top_100_Liked_Questions #Top_Interview_Questions #String #Hash_Table #Design #Trie
4-
// #Level_2_Day_16_Design #Udemy_Trie_and_Heap #Top_Interview_150_Trie
4+
// #LeetCode_75_Trie #Level_2_Day_16_Design #Udemy_Trie_and_Heap #Top_Interview_150_Trie
55
// #Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N)
6-
// #2024_03_22_Time_40_ms_(94.90%)_Space_8.6_MB_(96.69%)
6+
// #2025_05_09_Time_11_ms_(98.49%)_Space_16.18_MB_(42.49%)
77

88
import "strings"
99

‎src/main/go/g0201_0300/s0215_kth_largest_element_in_an_array/solution.go‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,9 +1,9 @@
11
package s0215_kth_largest_element_in_an_array
22

33
// #Medium #Top_100_Liked_Questions #Top_Interview_Questions #Array #Sorting #Heap_Priority_Queue
4-
// #Divide_and_Conquer #Quickselect #Data_Structure_II_Day_20_Heap_Priority_Queue
5-
// #Top_Interview_150_Heap #Big_O_Time_O(n*log(n))_Space_O(log(n))
6-
// #2024_03_22_Time_62_ms_(98.32%)_Space_7.5_MB_(94.86%)
4+
// #Divide_and_Conquer #Quickselect #LeetCode_75_Heap/Priority_Queue
5+
// #Data_Structure_II_Day_20_Heap_Priority_Queue #Top_Interview_150_Heap
6+
// #Big_O_Time_O(n*log(n))_Space_O(log(n)) #2025_05_09_Time_17_ms_(83.49%)_Space_10.00_MB_(66.67%)
77

88
import "sort"
99

‎src/main/go/g0201_0300/s0221_maximal_square/solution.go‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ package s0221_maximal_square
22

33
// #Medium #Array #Dynamic_Programming #Matrix #Dynamic_Programming_I_Day_16
44
// #Top_Interview_150_Multidimensional_DP #Big_O_Time_O(m*n)_Space_O(m*n)
5-
// #2024_03_22_Time_0_ms_(100.00%)_Space_7_MB_(29.80%)
5+
// #2025_05_09_Time_1_ms_(93.36%)_Space_8.70_MB_(81.82%)
66

77
func maximalSquare(matrix [][]byte) int {
88
m := len(matrix)

‎src/main/go/g0201_0300/s0226_invert_binary_tree/solution.go‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@ package s0226_invert_binary_tree
33
// #Easy #Top_100_Liked_Questions #Depth_First_Search #Breadth_First_Search #Tree #Binary_Tree
44
// #Data_Structure_I_Day_12_Tree #Level_2_Day_6_Tree #Udemy_Tree_Stack_Queue
55
// #Top_Interview_150_Binary_Tree_General #Big_O_Time_O(n)_Space_O(n)
6-
// #2024_03_22_Time_0_ms_(100.00%)_Space_2.4_MB_(5.25%)
6+
// #2025_05_09_Time_0_ms_(100.00%)_Space_4.17_MB_(55.19%)
77

88
type TreeNode struct {
99
Val int

‎src/main/go/g0201_0300/s0230_kth_smallest_element_in_a_bst/solution.go‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@ package s0230_kth_smallest_element_in_a_bst
33
// #Medium #Top_100_Liked_Questions #Depth_First_Search #Tree #Binary_Tree #Binary_Search_Tree
44
// #Data_Structure_II_Day_17_Tree #Level_2_Day_9_Binary_Search_Tree
55
// #Top_Interview_150_Binary_Search_Tree #Big_O_Time_O(n)_Space_O(n)
6-
// #2024_03_22_Time_0_ms_(100.00%)_Space_6.4_MB_(46.83%)
6+
// #2025_05_09_Time_0_ms_(100.00%)_Space_8.52_MB_(17.71%)
77

88
type TreeNode struct {
99
Val int

‎src/main/go/g0201_0300/s0234_palindrome_linked_list/solution.go‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ package s0234_palindrome_linked_list
22

33
// #Easy #Top_100_Liked_Questions #Two_Pointers #Stack #Linked_List #Recursion
44
// #Level_2_Day_3_Linked_List #Udemy_Linked_List #Big_O_Time_O(n)_Space_O(1)
5-
// #2024_03_23_Time_104_ms_(97.77%)_Space_8.2_MB_(84.40%)
5+
// #2025_05_09_Time_1_ms_(87.36%)_Space_10.64_MB_(70.30%)
66

77
type ListNode struct {
88
Val int

‎src/main/go/g0201_0300/s0236_lowest_common_ancestor_of_a_binary_tree/solution.go‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,8 +1,9 @@
11
package s0236_lowest_common_ancestor_of_a_binary_tree
22

33
// #Medium #Top_100_Liked_Questions #Depth_First_Search #Tree #Binary_Tree
4-
// #Data_Structure_II_Day_18_Tree #Udemy_Tree_Stack_Queue #Top_Interview_150_Binary_Tree_General
5-
// #Big_O_Time_O(n)_Space_O(n) #2024_03_23_Time_5_ms_(90.18%)_Space_7.7_MB_(22.79%)
4+
// #LeetCode_75_Binary_Tree/DFS #Data_Structure_II_Day_18_Tree #Udemy_Tree_Stack_Queue
5+
// #Top_Interview_150_Binary_Tree_General #Big_O_Time_O(n)_Space_O(n)
6+
// #2025_05_09_Time_5_ms_(89.93%)_Space_9.14_MB_(38.67%)
67

78
type TreeNode struct {
89
Val int

‎src/main/go/g0201_0300/s0238_product_of_array_except_self/solution.go‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,8 +1,8 @@
11
package s0238_product_of_array_except_self
22

3-
// #Medium #Top_100_Liked_Questions #Array #Prefix_Sum #Data_Structure_II_Day_5_Array #Udemy_Arrays
4-
// #Top_Interview_150_Array/String #Big_O_Time_O(n^2)_Space_O(n)
5-
// #2024_03_23_Time_20_ms_(77.65%)_Space_7.8_MB_(37.12%)
3+
// #Medium #Top_100_Liked_Questions #Array #Prefix_Sum #LeetCode_75_Array/String
4+
// #Data_Structure_II_Day_5_Array #Udemy_Arrays #Top_Interview_150_Array/String
5+
// #Big_O_Time_O(n^2)_Space_O(n) #2025_05_09_Time_0_ms_(100.00%)_Space_9.70_MB_(86.27%)
66

77
func productExceptSelf(nums []int) []int {
88
n := len(nums)

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