www.leetcode.com

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aenjon 2021-09-07 18:27:01

最近完成了www.leetcode.com的online judge中151道算法题目。除各个题目有特殊巧妙的解法以外，大部分题目都是经典的算法或者数据结构，因此做了如下小结，具体的解题思路可以搜索我的博客：LeetCode题解

题目   算法   数据结构   注意事项
Clone Graph   BFS   哈希表
Word Ladder II   BFS   哈希表
Surrounded Regions   BFS   矩阵
Word Ladder   BFS   N/A
Binary Tree Level Order Traversal   BFS|前序遍历   队列
Binary Tree Level Order Traversal II   BFS|前序遍历   队列
Binary Tree Zigzag Level Order Traversal    BFS|前序遍历   队列   每一层顺序分别对待
Implement strStr()   KMP算法   N/A
Copy List with Random Pointer   N/A   哈希表
Remove Duplicates from Sorted Array   N/A   哈希表
Remove Duplicates from Sorted Array II   N/A   哈希表
Set Matrix Zeroes   N/A   哈希表
Anagrams   N/A   哈希表
First Missing Positive   N/A   哈希表
Two Sum   N/A   哈希表
Evaluate Reverse Polish Notation   N/A   堆栈
Largest Rectangle in Histogram   N/A   堆栈   记录重要位置
Minimum Window Substring   N/A   堆栈
Simplify Path   N/A   堆栈
Longest Valid Parentheses   N/A   堆栈
Valid Parentheses   N/A   堆栈   词法分析
Container With Most Water   N/A   堆栈   记录重要位置
Reverse Words in a String   N/A   堆栈   翻转字符串
Best Time to Buy and Sell Stock   N/A   数组
Best Time to Buy and Sell Stock II   N/A   数组
Best Time to Buy and Sell Stock III   N/A   数组
Length of Last Word   N/A   数组
Search Insert Position   N/A   数组
Search for a Range   N/A   数组
Spiral Matrix   N/A   矩阵   简化为子问题
Spiral Matrix II   N/A   矩阵   简化为子问题
LRU Cache   N/A   链表
Reorder List   N/A   链表   快慢指针&链表倒序
Linked List Cycle   N/A   链表   快慢指针
Linked List Cycle II   N/A   链表   快慢指针
Reverse Linked List II   N/A   链表
Partition List   N/A   链表
Remove Duplicates from Sorted List   N/A   链表
Remove Duplicates from Sorted List II   N/A   链表
Merge Two Sorted Lists   N/A   链表
Rotate List   N/A   链表   快慢指针
Reverse Nodes in k-Group   N/A   链表
Swap Nodes in Pairs   N/A   链表
Remove Nth Node From End of List   N/A   链表   快慢指针
Text Justification   N/A   队列
Candy   N/A   N/A   简化为子问题
Valid Palindrome   N/A   N/A   首尾指针
Plus One   N/A   N/A   模拟加法运算
Valid Number   N/A   N/A   词法分析
Add Binary   N/A   N/A   模拟加法运算
Insert Interval   N/A   N/A
Merge Intervals   N/A   N/A
Multiply Strings   N/A   N/A   模拟乘法运算
Trapping Rain Water   N/A   N/A
Valid Sudoku   N/A   N/A
Roman to Integer   N/A   N/A
Integer to Roman   N/A   N/A
Palindrome Number   N/A   N/A
Reverse Integer   N/A   N/A
ZigZag Conversion   N/A   N/A
Add Two Numbers   N/A   N/A   模拟加法运算
Median of Two Sorted Arrays   N/A   N/A
String to Integer (atoi)   STL函数   N/A
Next Permutation   STL经典算法   N/A
Recover Binary Search Tree   中序遍历   二叉树
3Sum   二分查找   N/A
3Sum Closest   二分查找   N/A
4Sum   二分查找   N/A
Single Number   位运算   N/A
Single Number II   位运算   N/A
Construct Binary Tree from Preorder and Inorder Traversal   前序中序遍历   N/A
Binary Tree Preorder Traversal   前序遍历   二叉树
Flatten Binary Tree to Linked List   前序遍历   二叉树
Interleaving String   动态规划   二叉树
Unique Binary Search Trees   动态规划   二叉树
Word Break   动态规划   N/A
Word Break II   动态规划   N/A
Palindrome Partitioning   动态规划   N/A
Palindrome Partitioning II   动态规划   N/A
Triangle   动态规划   N/A
Distinct Subsequences   动态规划   N/A
Decode Ways   动态规划   N/A
Scramble String   动态规划   N/A
Maximal Rectangle   动态规划   N/A
Edit Distance   动态规划   N/A
Climbing Stairs   动态规划   N/A
Minimum Path Sum   动态规划   N/A
Unique Paths   动态规划   N/A
Unique Paths II   动态规划   N/A
Jump Game   动态规划   N/A
Jump Game II   动态规划   N/A
Maximum Subarray   动态规划   N/A
Wildcard Matching   动态规划   N/A
Substring with Concatenation of All Words   动态规划   N/A
Sort List   合并排序   链表   快慢指针
Merge Sorted Array   合并排序   N/A
Construct Binary Tree from Inorder and Postorder Traversal   后序中序遍历   N/A
Binary Tree Postorder Traversal   后续遍历   二叉树
Combinations   回溯   N/A
Permutation Sequence   回溯   N/A
N-Queens   回溯   N/A
N-Queens II   回溯   N/A
Permutations   回溯   N/A
Permutations II   回溯   N/A
Combination Sum   回溯   N/A
Combination Sum II   回溯   N/A
Sudoku Solver   回溯   N/A
Longest Substring Without Repeating Characters   回溯   N/A
Max Points on a Line   循环遍历   N/A   排除相同的点
Longest Common Prefix   循环遍历   N/A
Longest Palindromic Substring   循环遍历   N/A
Insertion Sort List   插入排序   链表
Rotate Image   矢量旋转与平移   N/A
Longest Consecutive Sequence   类BFS   哈希表
Search in Rotated Sorted Array   类二分查找   N/A
Search in Rotated Sorted Array II   类二分查找   N/A   特殊考虑相等数据
Sqrt(x)   类二分查找   N/A
Pow(x, n)   类二进制   N/A
Divide Two Integers   类二进制   N/A
Gas Station   类合并排序   N/A
Merge k Sorted Lists   类外排序   N/A
Sort Colors   类快速排序   N/A
Remove Element   类快速排序   N/A
Search a 2D Matrix   类杨氏矩阵   N/A
Restore IP Addresses   背包问题   N/A
Sum Root to Leaf Numbers   递归   二叉树
Binary Tree Maximum Path Sum   递归   二叉树
opulating Next Right Pointers in Each Node   递归   二叉树
Populating Next Right Pointers in Each Node II   递归   二叉树
Path Sum   递归   二叉树
Path Sum II   递归   二叉树
Maximum Depth of Binary Tree    递归   二叉树
Minimum Depth of Binary Tree   递归   二叉树
Balanced Binary Tree   递归   二叉树
Symmetric Tree   递归   二叉树
Same Tree    递归   二叉树
Validate Binary Search Tree   递归   二叉树
Unique Binary Search Trees II   递归   二叉树
Binary Tree Inorder Traversal   递归   二叉树
Pascal's Triangle   递归   N/A
Pascal's Triangle II   递归   N/A
Convert Sorted List to Binary Search Tree   递归   N/A   快慢指针&反中序遍历
Convert Sorted Array to Binary Search Tree   递归   N/A   反中序遍历
Subsets   递归   N/A
Subsets II   递归   N/A
Gray Code   递归   N/A
Word Search   递归   N/A
Count and Say   递归   N/A
Generate Parentheses   递归   N/A
Letter Combinations of a Phone Number   递归   N/A
Regular Expression Matching   递归   N/A