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Topic: Depth-First Search

245 problems
#TitleStatusDifficulty
79Word Search—Medium
94Binary Tree Inorder Traversal—Easy
98Validate Binary Search Tree—Medium
99Recover Binary Search Tree—Medium
100Same Tree—Easy
101Symmetric Tree—Easy
104Maximum Depth of Binary Tree—Easy
110Balanced Binary Tree—Easy
111Minimum Depth of Binary Tree—Easy
112Path Sum—Easy
113Path Sum II—Medium
114Flatten Binary Tree to Linked List—Medium
116Populating Next Right Pointers in Each Node—Medium
117Populating Next Right Pointers in Each Node II—Medium
124Binary Tree Maximum Path Sum—Hard
129Sum Root to Leaf Numbers—Medium
130Surrounded Regions—Medium
133Clone Graphread—Medium
144Binary Tree Preorder Traversal—Easy
145Binary Tree Postorder Traversal—Easy
199Binary Tree Right Side View—Medium
200Number of Islands—Medium
207Course Scheduleread—Medium
210Course Schedule IIread—Medium
211Design Add and Search Words Data Structureread—Medium
226Invert Binary Tree—Easy
230Kth Smallest Element in a BST—Medium
235Lowest Common Ancestor of a Binary Search Tree—Medium
236Lowest Common Ancestor of a Binary Tree—Medium
257Binary Tree Paths—Easy
261Graph Valid Tree—Medium
269Alien Dictionary—Hard
297Serialize and Deserialize Binary Treeread—Hard
310Minimum Height Trees—Medium
323Number of Connected Components in an Undirected Graphread—Medium
329Longest Increasing Path in a Matrix—Hard
332Reconstruct Itinerary—Hard
337House Robber III—Medium
341Flatten Nested List Iteratorread—Medium
365Water and Jug Problem—Medium
385Mini Parserread—Medium
386Lexicographical Numbersread—Medium
388Longest Absolute File Pathread—Medium
399Evaluate Divisionread—Medium
404Sum of Left Leaves—Easy
417Pacific Atlantic Water Flow—Medium
419Battleships in a Board—Medium
430Flatten a Multilevel Doubly Linked List—Medium
437Path Sum III—Medium
449Serialize and Deserialize BSTread—Medium
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