深度优先遍历

339 Nested List Weight Sum 61.4% Easy
100 Same Tree 46.3% Easy
101 Symmetric Tree 38.5% Easy
104 Maximum Depth of Binary Tree 52.4% Easy
257 Binary Tree Paths 38.0% Easy
112 Path Sum 33.9% Easy
108 Convert Sorted Array to Binary Search Tree 41.9% Easy
111 Minimum Depth of Binary Tree 33.0% Easy
110 Balanced Binary Tree 37.3% Easy
547 Friend Circles 49.5% Medium
513 Find Bottom Left Tree Value 55.5% Medium
505 The Maze II 36.6% Medium
638 Shopping Offers 40.5% Medium
494 Target Sum 43.9% Medium
491 Increasing Subsequences 38.9% Medium
490 The Maze 43.0% Medium
542 01 Matrix 32.9% Medium
473 Matchsticks to Square 35.0% Medium
533 Lonely Pixel II 42.1% Medium
439 Ternary Expression Parser 50.3% Medium
417 Pacific Atlantic Water Flow 33.5% Medium
394 Decode String 41.2% 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 III 43.1% Medium
332 Reconstruct Itinerary 29.0% Medium
576 Out of Boundary Paths 32.5% Medium
323 Number of Connected Components in an Undirected Graph 47.8% Medium
529 Minesweeper 50.0% Medium
261 Graph Valid Tree 37.5% Medium
105 Construct Binary Tree from Preorder and Inorder Traversal 32.0% Medium
210 Course Schedule II 27.6% Medium
207 Course Schedule 31.8% Medium
200 Number of Islands 34.2% Medium
199 Binary Tree Right Side View 40.6% Medium
133 Clone Graph 25.1% Medium
129 Sum Root to Leaf Numbers 36.4% Medium
515 Find Largest Value in Each Tree Row 54.7% Medium
117 Populating Next Right Pointers in Each Node II 33.7% Medium
116 Populating Next Right Pointers in Each Node 36.9% Medium
114 Flatten Binary Tree to Linked List 34.9% Medium
113 Path Sum II 33.3% Medium
106 Construct Binary Tree from Inorder and Postorder Traversal 32.0% Medium
109 Convert Sorted List to Binary Search Tree 33.8% Medium
98 Validate Binary Search Tree 23.2% Medium