LeetCode解题录-1~50

[leetcode]1. Two Sum两数之和	Two Pointers, HashMap	Easy
[leetcode]2. Add Two Numbers两数相加	Math, LinkedList	Medium
[leetcode]3. Longest Substring Without Repeating Characters无重复字母的最长子串	Sliding Window	Medium
[leetcode]4. Median of Two Sorted Arrays俩有序数组的中位数	Merge Sort, Binary Search	Hard
[leetcode]5. Longest Palindromic Substring最长回文子串	Dynamic Programming, Manacher	Medium
[leetcode]6. ZigZag Conversion字符串Z形排列	String	Medium
[leetcode]7. Reverse Integer反转整数	Math	Easy
[leetcode]8. String to Integer (atoi)字符串转整数	Math	Medium
[leetcode]9. Palindrome Number 回文数	Math	Easy
[leetcode]10. Regular Expression Matching正则表达式的匹配	Dynamic Programming	Hard
[leetcode]11. Container With Most Water存水最多的容器	Two Pointers	Easy
[leetcode]12. Integer to Roman整数转罗马数字	String	Easy
[leetcode]13. Roman to Integer罗马数字转整数	String	Easy
[leetcode]14. Longest Common Prefix 最长公共前缀	String	Easy
[leetcode]15. 3Sum三数之和	Two Pointers	Medium
[leetcode]16. 3Sum Closest最接近的三数之和	Two Pointers	Medium
[leetcode]17. Letter Combinations of a Phone Number手机键盘的字母组合	Backtracking	Medium
[leetcode]18. 4Sum四数之和	Two Pointers	Medium
[leetcode]19. Remove Nth Node From End of List删除链表倒数第N个节点	LinkedList	Easy
[leetcode]20. Valid Parentheses有效括号序列	Stack	Easy
[leetcode]21. Merge Two Sorted Lists合并两个链表	Merge Sort	Easy
[leetcode]22. Generate Parentheses生成括号	Backtracking	Medium
[leetcode]23. Merge k Sorted Lists归并k个有序链表	PriorityQueue	Medium
[leetcode]24. Swap Nodes in Pairs交换节点对	LinkedList	Easy
[leetcode]25. Reverse Nodes in k-Group每k个节点反转一下	LinkedList	Hard
[leetcode]26. Remove Duplicates from Sorted Array有序数组去重(单个元素只出现一次)	Two Pointers	Easy
[leetcode]27. Remove Element删除元素	Two Pointers	Easy
[leetcode]28. Implement strStr()实现strStr()	Two Pointers	Easy
[leetcode]29. Divide Two Integers两整数相除	Math	Medium
[leetcode]30. Substring with Concatenation of All Words由所有单词连成的子串	Sliding Window	Hard
[leetcode]31. Next Permutation 下一个排列	Array	Medium
[leetcode]32. Longest Valid Parentheses最长合法括号子串	Stack, Two Pointers	Medium
[leetcode]33. Search in Rotated Sorted Array旋转过有序数组里找目标值	Binary Search	Medium
[leetcode]34.Find First and Last Position of Element in Sorted Array找区间	Binary Search	Medium
[leetcode]35. Search Insert Position寻找插入位置	Binary Search	Easy
[leetcode]36. Valid Sudoku验证数独	HashMap	Medium
[leetcode]37. Sudoku Solver 解数独	Backtracking	Hard
[leetcode]38. Count and Say数数	String	Easy
[leetcode]39. Combination Sum组合之和	Backtracking	Medium
[leetcode]40. Combination Sum II组合之和之二	Backtracking	Medium
[leetcode]41. First Missing Positive第一个未出现的正数	Bucket Sort	Hard
[leetcode]42. Trapping Rain Water雨水积水问题	Two Pointers	Medium
[leetcode]43. Multiply Strings高精度乘法	Math	Medium
[leetcode]44. Wildcard Matching万能符匹配	Dynamic Programming	Hard
[leetcode]45. Jump Game II青蛙跳(跳到终点最小步数)	Greedy	Hard
[leetcode]46. Permutations全排列(给定序列无重复元素)	Backtracking	Medium
[leetcode]47. Permutations全排列(给定序列有重复元素)	Backtracking	Medium
[leetcode]48. Rotate Image旋转图像	Array	Medium
[leetcode]49. Group Anagrams变位词归类	HashMap	Medium
[leetcode]50. Pow(x, n)求幂	Binary Search	Medium