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26. Remove Duplicates from Sorted Array Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return t 阅读全文
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25. Reverse Nodes in k-Group Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. k is a positive integer 阅读全文
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24. Swap Nodes in Pairs Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list's nodes, onl 阅读全文
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23. Merge k Sorted Lists Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Example: 阅读全文
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22. Generate Parentheses Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n 阅读全文
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21. Merge Two Sorted Lists Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of th 阅读全文
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20. Valid Parentheses Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input 阅读全文
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19. Remove Nth Node From End of List Given a linked list, remove the n-th node from the end of list and return its head. Example: 阅读全文
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18. 4Sum Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c + d = target? Find all 阅读全文
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17. Letter Combinations of a Phone Number Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number 阅读全文
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16. 3Sum Closest Given an array nums of n integers and an integer target, find three integers in nums such that the sum is closest to target. Return t 阅读全文
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15. 3Sum Given an array nums of n integers, are there elements a, b, c in nums such that a + b+ c = 0? Find all unique triplets in the array which giv 阅读全文
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14. Longest Common Prefix Write a function to find the longest common prefix string amongst an array of strings. If there is no common prefix, return 阅读全文
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13. Roman to Integer Roman numerals are represented by seven different symbols: I, V, X, L, C, Dand M. For example, two is written as II in Roman nume 阅读全文
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12. Integer to Roman Roman numerals are represented by seven different symbols: I, V, X, L, C, Dand M. For example, two is written as II in Roman nume 阅读全文
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11. Container With Most Water Given n non-negative integers a1, a2, ..., an , where each represents a point at coordinate (i, ai). n vertical lines ar 阅读全文
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10. Regular Expression Matching Given an input string (s) and a pattern (p), implement regular expression matching with support for '.' and '*'. The m 阅读全文
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9. Palindrome Number Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: E 阅读全文
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8. String to Integer (atoi) Implement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessa 阅读全文
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7. Reverse Integer Given a 32-bit signed integer, reverse digits of an integer. Example 1: Example 2: Example 3: 阅读全文