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LeetCode: Remove Nth Node From End of List [019]
【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 ...
分类:其他好文   时间:2014-05-18 18:48:03    阅读次数:269
leetcode: 3Sum
题目:给定一个数组和一个目标值,返回所有不重复的3元组,每个元组的和等于目标值,且元组中,各元素按飞递减顺序。 先对其进行排序,在利用2sum,在2sum中,要求和为0,这里可以将数组中的元素的相反数作为和,找到另外两个数,那么三者的和为0。 在2sum中,经过排序后,总的时间复杂度是排序算法的复杂度占主导O(NlogN),在查找时是遍历数组,复杂度为O(n)。那么在3sum中,首先进行排序,...
分类:其他好文   时间:2014-05-18 14:02:28    阅读次数:249
Leetcode 151题 Reverse Words in a String
Leetcode 151题 Reverse Words in a String...
分类:其他好文   时间:2014-05-18 10:51:21    阅读次数:243
LeetCode 016 3Sum Closest
【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 = {...
分类:其他好文   时间:2014-05-18 10:37:57    阅读次数:269
LeetCode: Valid Parentheses [020]
【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...
分类:其他好文   时间:2014-05-18 10:08:11    阅读次数:327
LeetCode: Generate Parentheses [021]
【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...
分类:其他好文   时间:2014-05-18 09:06:41    阅读次数:266
LeetCode 017 4Sum
【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...
分类:其他好文   时间:2014-05-18 08:46:04    阅读次数:227
LeetCode: Letter Combinations of a Phone Number [018]
【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",...
分类:其他好文   时间:2014-05-18 07:30:12    阅读次数:340
LeetCode--Symmetric Tree
对于本题,想到一个中序遍历后,判别是否为回文串的方法,却WA多次 class Solution { public: vector vectorValue; void inOrder(TreeNode* root) { if(root!=NULL) { inOrder(root->left);...
分类:其他好文   时间:2014-05-18 06:38:58    阅读次数:294
[LeetCode]3Sum Closest
3SumClosest 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....
分类:其他好文   时间:2014-05-18 05:57:48    阅读次数:244
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