【题目】
Given a linked list, remove the nth node from the end of list and return its head.
For example,
Given linked list: 1->2->3->4->5, and n = 2.
After removing the second node from the end, the linked list becomes 1->2->3->5.
Note:
Given n will ...
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其他好文 时间：
2014-05-18 18:48:03
阅读次数：
269
【题目】
Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution.
For example, given array S = {...
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其他好文 时间：
2014-05-18 10:37:57
阅读次数：
269
【题目】
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.
【题意】
判断给定的字符串是否是合法的...
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其他好文 时间：
2014-05-18 10:08:11
阅读次数：
327
【题目】
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
For example, given n = 3, a solution set is:
"((()))", "(()())", "(())()", "()(())", "()()()"
【题意】
给定n对括号，输出所有可行的括号组合字符串。所谓合法，就是可以Valid Pare...
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其他好文 时间：
2014-05-18 09:06:41
阅读次数：
266
【题目】
Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.
【题意】
合并K个有序链表
【思路】
归并
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
For ...
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其他好文 时间：
2014-05-18 09:05:40
阅读次数：
255
【题目】
Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target.
Note:
Elements in a quadruplet (a,b,c,d) must be in non-descending ord...
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其他好文 时间：
2014-05-18 08:46:04
阅读次数：
227
【题目】
Given a digit string, return all possible letter combinations that the number could represent.
A mapping of digit to letters (just like on the telephone buttons) is given below.
Input:Digit string "23"
Output: ["ad", "ae", "af", "bd", "be", "bf",...
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其他好文 时间：
2014-05-18 07:30:12
阅读次数：
340
经典排序算法：冒泡排序法
让算法会说话，让程序自己告诉我们怎么回事
并有优化方法，使算法效率更高...
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其他好文 时间：
2014-05-18 05:34:13
阅读次数：
281
【题目】
Write a function to find the longest common prefix string amongst an array of strings.
【题意】
求一组字符串的最长公共前缀
【思路】
使用归并思想求解
要求字符串[1,2,..,k,k+1,...n]的最大公共前缀，先分别求[1,2,...k]和[k+1,...,n]的公共前缀...
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其他好文 时间：
2014-05-18 05:17:53
阅读次数：
232
【题目】
Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.
Note:
Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c)
The so...
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其他好文 时间：
2014-05-18 03:15:50
阅读次数：
287
