深度优先遍历

339 Nested List Weight Sum 61.4% Easy
100 Same Tree 46.3% Easy
101 Symmetric Tree38.5% Easy
104 Maximum Depth of Binary Tree52.4% Easy
257 Binary Tree Paths38.0% Easy
112 Path Sum 33.9% Easy
108 Convert Sorted Array to Binary Search Tree41.9% Easy
111 Minimum Depth of Binary Tree33.0% Easy
110 Balanced Binary Tree37.3% Easy
547 Friend Circles49.5% Medium
513 Find Bottom Left Tree Value55.5% Medium
505 The Maze II 36.6% Medium
638 Shopping Offers40.5% Medium
494 Target Sum43.9% Medium
491 Increasing Subsequences38.9% Medium
490 The Maze 43.0%Medium
542 01 Matrix 32.9% Medium
473 Matchsticks to Square35.0% Medium
533 Lonely Pixel II 42.1% Medium
439 Ternary Expression Parser 50.3% Medium
417 Pacific Atlantic Water Flow33.5% Medium
394 Decode String41.2% Medium
366 Find Leaves of Binary Tree 59.2% Medium
364 Nested List Weight Sum II 52.0% Medium
531 Lonely Pixel I 54.0% Medium
337 House Robber III43.1% Medium
332 Reconstruct Itinerary29.0% Medium
576 Out of Boundary Paths32.5% Medium
323 Number of Connected Components in an Undirected Graph47.8% Medium
529 Minesweeper50.0% Medium
261 Graph Valid Tree 37.5% Medium
105 Construct Binary Tree from Preorder and Inorder Traversal32.0% Medium
210 Course Schedule II27.6% Medium
207 Course Schedule31.8% Medium
200 Number of Islands34.2% Medium
199 Binary Tree Right Side View40.6% Medium
133 Clone Graph25.1% Medium
129 Sum Root to Leaf Numbers36.4% Medium
515 Find Largest Value in Each Tree Row54.7% Medium
117 Populating Next Right Pointers in Each Node II33.7% Medium
116 Populating Next Right Pointers in Each Node36.9% Medium
114 Flatten Binary Tree to Linked List34.9% Medium
113 Path Sum II33.3% Medium
106 Construct Binary Tree from Inorder and Postorder Traversal32.0% Medium
109 Convert Sorted List to Binary Search Tree33.8% Medium
98 Validate Binary Search Tree23.2% Medium