Depth-first Search

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# Title Acceptance Difficulty
576 Out of Boundary Paths 33.2% Hard
547 Friend Circles 49.0% Medium
546 Remove Boxes 29.7% Hard
542 01 Matrix 32.8% Medium
533 Lonely Pixel II 40.2% Medium
531 Lonely Pixel I 52.3% Medium
529 Minesweeper 51.1% Medium
515 Find Largest Value in Each Tree Row 54.3% Medium
514 Freedom Trail 35.5% Hard
513 Find Bottom Left Tree Value 55.8% Medium
505 The Maze II 35.9% Medium
499 The Maze III 31.1% Hard
494 Target Sum 43.8% Medium
491 Increasing Subsequences 38.6% Medium
490 The Maze 42.6% Medium
488 Zuma Game 36.0% Hard
473 Matchsticks to Square 34.4% Medium
472 Concatenated Words 29.5% Hard
439 Ternary Expression Parser 50.6% Medium
417 Pacific Atlantic Water Flow 33.2% Medium
394 Decode String 40.8% Medium
366 Find Leaves of Binary Tree 58.7% Medium
364 Nested List Weight Sum II 51.6% Medium
339 Nested List Weight Sum 61.1% Easy
337 House Robber III 42.7% Medium
332 Reconstruct Itinerary 28.7% Medium
329 Longest Increasing Path in a Matrix 35.9% Hard
323 Number of Connected Components in an Undirected Graph 47.6% Medium
301 Remove Invalid Parentheses 35.0% Hard
261 Graph Valid Tree 37.3% Medium
257 Binary Tree Paths 37.2% Easy
210 Course Schedule II 27.0% Medium
207 Course Schedule 31.4% Medium
200 Number of Islands 33.8% Medium
199 Binary Tree Right Side View 40.0% Medium
133 Clone Graph 25.1% Medium
129 Sum Root to Leaf Numbers 36.0% Medium
124 Binary Tree Maximum Path Sum 25.6% Hard
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 34.5% Medium
113 Path Sum II 32.8% Medium
112 Path Sum 33.6% Easy
111 Minimum Depth of Binary Tree 32.8% Easy
110 Balanced Binary Tree 37.0% Easy
109 Convert Sorted List to Binary Search Tree 33.5% Medium
108 Convert Sorted Array to Binary Search Tree 41.5% Easy
106 Construct Binary Tree from Inorder and Postorder Traversal 31.6% Medium
105 Construct Binary Tree from Preorder and Inorder Traversal 31.6% Medium
104 Maximum Depth of Binary Tree 52.0% Easy
101 Symmetric Tree 38.1% Easy
100 Same Tree 46.0% Easy
99 Recover Binary Search Tree 29.4% Hard
98 Validate Binary Search Tree 23.0% Medium
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