solutions
Valid Palindrome
String to Integer (atoi)
addBinary
Longest Palindromic Substring
Regular Expression Matching
Valid Number
Count and say
Valid anagram
Simplify Path
Length of last word
Longest Valid Parentheses
Valid Parentheses
Largest Rectangle in Histogram
Evaluate Reverse Polish Notation
- Morris 算法介绍
Binary Tree Preorder Traversal
- //stack
- //morris
Binary Tree Inorder Traversal
- //stack
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Binary Tree Postorder Traversal
- //stack
Binary Tree Level Order Traversal
- 递归
- 迭代
Binary Tree Zigzag Level Order Traversal
- 递归
- 迭代
Recover Binary Search Tree
- Recursive
- morris
Same Tree
Symmetric Tree
- Recursive
- Iterative
Balanced Binary Tree
Flatten Binary Tree to Linked List
- Iterative and recursive
Populating Next Right Pointers in Each Node II
- Iterative
- Recursive
Construct Binary Tree from Preorder and Inorder Traversal
Construct Binary Tree from Inorder and Postorder Traversal
Unique Binary Search Trees
Validate Binary Search Tree
Convert Sorted Array to Binary Search Tree
Convert Sorted List to Binary Search Tree
Minimum Depth of Binary Tree
Maximum Depth of Binary Tree
Path Sum
Path Sum II
Binary Tree Maximum Path Sum
Populating Next Right Pointers in Each Node
Sum Root to Leaf Numbers
Merge Sorted Array
Merge Two Sorted Lists
- cpp
- java
Merge k Sorted Lists
- Priority queue
- merge sort
Insertion Sort List
Sort List
First Missing Positive
Sort Colors
Search for a Range
Search Insert Position
- Recursive
- Iterative
Search a 2D Matrix
*string 的子集(bit)
Subsets
Subsets II
- Recursive
- Iterative
Permutations
Permutations II
- Java
CPP
Combinations
- Recursive
Iterative
Letter Combinations of a Phone Number
- Recursive
BFS VS DFS
Word Ladder
- Java

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Binary Tree Preorder Traversal

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