Name		Name	Last commit message	Last commit date
Latest commit History 1,606 Commits
1. Two Sum (HashTable) 20.1.28 Easy		1. Two Sum (HashTable) 20.1.28 Easy
10. Regular Expression Matching (Dynamic Programming) 20.4.19 Hard		10. Regular Expression Matching (Dynamic Programming) 20.4.19 Hard
100. Same Tree (DFS) 20.3.14 Easy		100. Same Tree (DFS) 20.3.14 Easy
1000. Minimum Cost to Merge Stones (Dynamic Programming) 19.11.27 Hard		1000. Minimum Cost to Merge Stones (Dynamic Programming) 19.11.27 Hard
1007. Minimum Domino Rotations For Equal Row 20.6.17 Medium		1007. Minimum Domino Rotations For Equal Row 20.6.17 Medium
101. Symmetric Tree (DFS + BFS) 20.3.14 Easy		101. Symmetric Tree (DFS + BFS) 20.3.14 Easy
102. Binary Tree Level Order Traversal (BFS) 20.3.15 Medium		102. Binary Tree Level Order Traversal (BFS) 20.3.15 Medium
1029. Two City Scheduling (Greedy + Sort) 20.4.19 Easy		1029. Two City Scheduling (Greedy + Sort) 20.4.19 Easy
103. Binary Tree Zigzag Level Order Traversal (Deque + BFS) 20.3.15 Medium		103. Binary Tree Zigzag Level Order Traversal (Deque + BFS) 20.3.15 Medium
1031. Maximum Sum of Two Non-Overlapping Subarrays (Subarray Sum => Prefix Sum !) 20.6.16 Medium		1031. Maximum Sum of Two Non-Overlapping Subarrays (Subarray Sum => Prefix Sum !) 20.6.16 Medium
104. Maximum Depth of Binary Tree (DFS + BFS) 20.3.16 Easy		104. Maximum Depth of Binary Tree (DFS + BFS) 20.3.16 Easy
1044. Longest Duplicate Substring		1044. Longest Duplicate Substring
1048. Longest String Chain (Dynamic Programming) 20.6.15 Medium		1048. Longest String Chain (Dynamic Programming) 20.6.15 Medium
105. Construct Binary Tree from Preorder and Inorder Traversal (DFS) 20.3.17 Medium		105. Construct Binary Tree from Preorder and Inorder Traversal (DFS) 20.3.17 Medium
106. Construct Binary Tree from Inorder and Postorder Traversal (DFS) 20.3.17 Medium		106. Construct Binary Tree from Inorder and Postorder Traversal (DFS) 20.3.17 Medium
1060. Missing Element in Sorted Array(Binary Search) 20.9.12 Medium		1060. Missing Element in Sorted Array(Binary Search) 20.9.12 Medium
107. Binary Tree Level Order Traversal II (Deque + BFS) 20.3.14 Medium		107. Binary Tree Level Order Traversal II (Deque + BFS) 20.3.14 Medium
108. Convert Sorted Array to Binary Search Tree (Divide and Conquer) 20.3.18 Easy		108. Convert Sorted Array to Binary Search Tree (Divide and Conquer) 20.3.18 Easy
1088. Confusing Number II (Backtracking) 20.6.4 Hard		1088. Confusing Number II (Backtracking) 20.6.4 Hard
109. Convert Sorted List to Binary Search Tree (Linked List + Two Pointers + DFS) 20.3.18 Medium		109. Convert Sorted List to Binary Search Tree (Linked List + Two Pointers + DFS) 20.3.18 Medium
1099. Two Sum Less Than K (Two Pointers) 20.5.21 Easy		1099. Two Sum Less Than K (Two Pointers) 20.5.21 Easy
11. Container With Most Water (Two Pointers) 20.2.3 Medium		11. Container With Most Water (Two Pointers) 20.2.3 Medium
110. Balanced Binary Tree (DFS) 20.3.16 Easy		110. Balanced Binary Tree (DFS) 20.3.16 Easy
1102. Path With Maximum Minimum Value (Heap + Greedy) 20.5.22 Medium		1102. Path With Maximum Minimum Value (Heap + Greedy) 20.5.22 Medium
111. Minimum Depth of Binary Tree (BFS + DFS) 20.3.16 Easy		111. Minimum Depth of Binary Tree (BFS + DFS) 20.3.16 Easy
1110. Delete Nodes And Return Forest (DFS) 20.6.3 Medium		1110. Delete Nodes And Return Forest (DFS) 20.6.3 Medium
112. Path Sum (DFS) 20.3.18 Easy		112. Path Sum (DFS) 20.3.18 Easy
1123. Lowest Common Ancestor of Deepest Leaves(Divide and Conquer) 20.9.21 Medium		1123. Lowest Common Ancestor of Deepest Leaves(Divide and Conquer) 20.9.21 Medium
113. Path Sum II (DFS) 20.3.18 Medium		113. Path Sum II (DFS) 20.3.18 Medium
114. Flatten Binary Tree to Linked List (DFS: reversed pre-order traversal) 20.3.19 Medium		114. Flatten Binary Tree to Linked List (DFS: reversed pre-order traversal) 20.3.19 Medium
1146. Snapshot Array (Array + Binary Search) 20.9.13 Medium		1146. Snapshot Array (Array + Binary Search) 20.9.13 Medium
1153. String Transforms Into Another String (String) 20.6.4 Hard		1153. String Transforms Into Another String (String) 20.6.4 Hard
116. Populating Next Right Pointers in Each Node (BFS + Iteriative) 20.3.20 Medium		116. Populating Next Right Pointers in Each Node (BFS + Iteriative) 20.3.20 Medium
1167. Minimum Cost to Connect Sticks (Greedy with Heap) 20.5.22 Medium		1167. Minimum Cost to Connect Sticks (Greedy with Heap) 20.5.22 Medium
1169. Invalid Transactions (Sort by lambda + HashTable) 20.4.20 Medium		1169. Invalid Transactions (Sort by lambda + HashTable) 20.4.20 Medium
117. Populating Next Right Pointers in Each Node II (Iterative) 20.3.20 Medium		117. Populating Next Right Pointers in Each Node II (Iterative) 20.3.20 Medium
118. Pascal's Triangle (Dynamic Programming) 20.3.20 Easy		118. Pascal's Triangle (Dynamic Programming) 20.3.20 Easy
1188. Design Bounded Blocking Queue(Thread) 20.9.22 Medium		1188. Design Bounded Blocking Queue(Thread) 20.9.22 Medium
119. Pascal's Triangle II (Dynamic Programming) 20.3.20 Easy		119. Pascal's Triangle II (Dynamic Programming) 20.3.20 Easy
1192. Critical Connections in a Network (DFS) 19.11.23 Hard		1192. Critical Connections in a Network (DFS) 19.11.23 Hard
12. Integer to Roman (Math) 20.2.3 Easy		12. Integer to Roman (Math) 20.2.3 Easy
120. Triangle (Dynamic Programming) 20.3.21 Medium		120. Triangle (Dynamic Programming) 20.3.21 Medium
1209. Remove All Adjacent Duplicates in String II (Stack) 19.12.8 Medium		1209. Remove All Adjacent Duplicates in String II (Stack) 19.12.8 Medium
121. Best Time to Buy and Sell Stock (Greedy - One pass) 20.2.19 Easy		121. Best Time to Buy and Sell Stock (Greedy - One pass) 20.2.19 Easy
122. Best Time to Buy and Sell Stock II (Greedy - Peak Valley Approach) 20.2.20 Easy		122. Best Time to Buy and Sell Stock II (Greedy - Peak Valley Approach) 20.2.20 Easy
123. Best Time to Buy and Sell Stock III(Bidirectional Dynamic Programming) 20.10.5 Hard		123. Best Time to Buy and Sell Stock III(Bidirectional Dynamic Programming) 20.10.5 Hard
1231. Divide Chocolate (Binary Search Template) 20.6.25 Hard		1231. Divide Chocolate (Binary Search Template) 20.6.25 Hard
124. Binary Tree Maximum Path Sum (DFS) 20.4.20 Hard		124. Binary Tree Maximum Path Sum (DFS) 20.4.20 Hard
1240. Tiling a Rectangle with the Fewest Squares(Backtracking) 20.9.12 Hard		1240. Tiling a Rectangle with the Fewest Squares(Backtracking) 20.9.12 Hard
1244. Design A Leaderboard(Heapq) 20.9.22 Medium		1244. Design A Leaderboard(Heapq) 20.9.22 Medium
1249. Minimum Remove to Make Valid Parentheses (Stack) 20.5.28 Medium		1249. Minimum Remove to Make Valid Parentheses (Stack) 20.5.28 Medium
125. Valid Palindrome (Two Pointers) 20.2.2 Easy		125. Valid Palindrome (Two Pointers) 20.2.2 Easy
126. Word Ladder II (BFS) 20.4.30 Hard		126. Word Ladder II (BFS) 20.4.30 Hard
127. Word Ladder (HashTable + BFS) 20.3.22 Medium		127. Word Ladder (HashTable + BFS) 20.3.22 Medium
1274. Number of Ships in a Rectangle(Divide and Conquer) 20.9.21 Hard		1274. Number of Ships in a Rectangle(Divide and Conquer) 20.9.21 Hard
1277. Count Square Submatrices with All One (Dynamic Programming) 20.6.29 Medium		1277. Count Square Submatrices with All One (Dynamic Programming) 20.6.29 Medium
128. Longest Consecutive Sequence (Sort + HashSet) 20.4.22 Hard		128. Longest Consecutive Sequence (Sort + HashSet) 20.4.22 Hard
129. Sum Root to Leaf Numbers (DFS) 20.3.19 Medium		129. Sum Root to Leaf Numbers (DFS) 20.3.19 Medium
1293. Shortest Path in a Grid with Obstacles Elimination(BFS) 20.9.13 Hard		1293. Shortest Path in a Grid with Obstacles Elimination(BFS) 20.9.13 Hard
1296. Divide Array in Sets of K Consecutive Numbers (Counter) 20.6.21 Medium		1296. Divide Array in Sets of K Consecutive Numbers (Counter) 20.6.21 Medium
13. Roman to Integer (Hashtable + Math) 20.2.3 Easy		13. Roman to Integer (Hashtable + Math) 20.2.3 Easy
130. Surrounded Regions (BFS + Queue) 20.3.24 Medium		130. Surrounded Regions (BFS + Queue) 20.3.24 Medium
131. Palindrome Partitioning (Backtracking) 20.3.25 Medium		131. Palindrome Partitioning (Backtracking) 20.3.25 Medium
1320. Minimum Distance to Type a Word Using Two Fingers (Dynamic Programming) 20.6.23 Hard		1320. Minimum Distance to Type a Word Using Two Fingers (Dynamic Programming) 20.6.23 Hard
133. Clone Graph (Deep Copy + HashTable + DFS) 20.3.26 Medium		133. Clone Graph (Deep Copy + HashTable + DFS) 20.3.26 Medium
134. Gas Station (Greedy) 20.4.22 Medium		134. Gas Station (Greedy) 20.4.22 Medium
1345. Jump Game IV(BFS) 20.7.8 Hard		1345. Jump Game IV(BFS) 20.7.8 Hard
136. Single Number (Bit Manipulation)		136. Single Number (Bit Manipulation)
137. Single Number II (Bit Manipulation)		137. Single Number II (Bit Manipulation)
1376. Time Needed to Inform All Employees (Heap + BFS) 20.9.11 Medium		1376. Time Needed to Inform All Employees (Heap + BFS) 20.9.11 Medium
138. Copy List with Random Pointer (Deep Copy + HashTable + DFS + Interleaving: O(1) S)) 20.3.26 Medium		138. Copy List with Random Pointer (Deep Copy + HashTable + DFS + Interleaving: O(1) S)) 20.3.26 Medium
139. Word Break (Dynamic Programming) 20.3.27 Medium		139. Word Break (Dynamic Programming) 20.3.27 Medium
14. Longest Common Prefix (String - Horizontal Scanning) 20.2.4 Easy		14. Longest Common Prefix (String - Horizontal Scanning) 20.2.4 Easy
140. Word Break II (DFS + DP + Memo) 20.9.20 Hard		140. Word Break II (DFS + DP + Memo) 20.9.20 Hard
141. Linked List Cycle (HashTable+ Two Pointers) 20.3.27 Easy		141. Linked List Cycle (HashTable+ Two Pointers) 20.3.27 Easy
142. Linked List Cycle II (HashTable + Two Pointers) 20.3.27 Medium		142. Linked List Cycle II (HashTable + Two Pointers) 20.3.27 Medium
1423. Maximum Points You Can Obtain from Cards(Sliding Window) 20.7.6 Medium		1423. Maximum Points You Can Obtain from Cards(Sliding Window) 20.7.6 Medium
143. Reorder List (Linked List) 20.3.29 Medium		143. Reorder List (Linked List) 20.3.29 Medium
1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit (Sliding Window + Deque) 20.6.29 Medium		1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit (Sliding Window + Deque) 20.6.29 Medium
144. Binary Tree Preorder Traversal (DFS +Stack) 20.3.7 Medium		144. Binary Tree Preorder Traversal (DFS +Stack) 20.3.7 Medium
145. Binary Tree Postorder Traversal (DFS + Stack in modified pre-order) 20.3.7 Hard		145. Binary Tree Postorder Traversal (DFS + Stack in modified pre-order) 20.3.7 Hard
1458. Max Dot Product of Two Subsequences (Dynamic Programming) 20.6.10 Hard		1458. Max Dot Product of Two Subsequences (Dynamic Programming) 20.6.10 Hard
146. LRU Cache (Design: Deque + HashTable + Double Linked List) 20.4.23 Medium		146. LRU Cache (Design: Deque + HashTable + Double Linked List) 20.4.23 Medium
1463. Cherry Pickup II(DFS + memo) 20.9.13 Hard		1463. Cherry Pickup II(DFS + memo) 20.9.13 Hard
147. Insertion Sort List (Three Pointers: dummy, curr, p - Insertion Sort)		147. Insertion Sort List (Three Pointers: dummy, curr, p - Insertion Sort)
1473. Paint House III (Dynamic Programming) 20.6.7 Hard		1473. Paint House III (Dynamic Programming) 20.6.7 Hard
148. Sort List (Linked List + Divide and Conquer + Merge Sort) 20.2.8 Medium		148. Sort List (Linked List + Divide and Conquer + Merge Sort) 20.2.8 Medium
1487. Making File Names Unique (HashMap + Path Compression) 20.6.21 Medium		1487. Making File Names Unique (HashMap + Path Compression) 20.6.21 Medium
149. Max Points on a Line (HashTable)		149. Max Points on a Line (HashTable)
1498. Number of Subsequences That Satisfy the Given Sum Condition (Two Pointers) 20.6.28 Medium		1498. Number of Subsequences That Satisfy the Given Sum Condition (Two Pointers) 20.6.28 Medium
15. 3Sum (Two Pointers) 20.1.28 Medium		15. 3Sum (Two Pointers) 20.1.28 Medium
150. Evaluate Reverse Polish Notation (Stack + isdigit() + lstrip("-"))		150. Evaluate Reverse Polish Notation (Stack + isdigit() + lstrip("-"))
1504. Count Submatrices With All Ones(Dynamic Programming) 20.7.6 Medium		1504. Count Submatrices With All Ones(Dynamic Programming) 20.7.6 Medium
1509. Minimum Difference Between Largest and Smallest Value in Three Moves(Array) 20.7.11 Medium		1509. Minimum Difference Between Largest and Smallest Value in Three Moves(Array) 20.7.11 Medium
151. Reverse Words in a String(split() + join() + strip())		151. Reverse Words in a String(split() + join() + strip())
152. Maximum Product Subarray (Dynamic Programming) 20.2.19 Medium		152. Maximum Product Subarray (Dynamic Programming) 20.2.19 Medium
153. Find Minimum in Rotated Sorted Array (Binary Search) 20.2.11 Medium		153. Find Minimum in Rotated Sorted Array (Binary Search) 20.2.11 Medium
1548. The Most Similar Path in a Graph(Dynamic Programming) 20.9.13 Hard		1548. The Most Similar Path in a Graph(Dynamic Programming) 20.9.13 Hard
155. Min Stack (Design + Stack) 20.3.30 Easy		155. Min Stack (Design + Stack) 20.3.30 Easy
159. Longest Substring with At Most Two Distinct Characters (Sliding Window + Counter) 20.5.23 Medium		159. Longest Substring with At Most Two Distinct Characters (Sliding Window + Counter) 20.5.23 Medium

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