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projecteuler---->problem=4----Largest palindrome product
title: Largest palindrome product Problem 4 A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 99. Find the l...
分类:其他好文   时间:2014-06-07 01:24:27    阅读次数:398
[leetcode]Longest Consecutive Sequence @ Python
原题地址:https://oj.leetcode.com/problems/longest-consecutive-sequence/题意:Given an unsorted array of integers, find the length of the longest consecutive ...
分类:编程语言   时间:2014-06-06 23:13:20    阅读次数:324
[LeetCode]Longest Valid Parentheses
Longest Valid Parentheses 最长有效括号对...
分类:其他好文   时间:2014-06-05 01:16:14    阅读次数:215
projecteuler---->problem=14----Longest Collatz sequence
title: The following iterative sequence is defined for the set of positive integers: n n/2 (n is even) n 3n + 1 (n is odd) Using the rule above and starting with 13, we generate the followi...
分类:其他好文   时间:2014-06-04 13:56:33    阅读次数:254
每日算法之二十八:Longest Valid Parentheses
求最长合法匹配的长度,这道题可以用一维动态规划逆向求解。假设输入括号表达式为String s,维护一个长度为s.length的一维数组dp[],数组元素初始化为0。 dp[i]表示从s[i]到s[s.length - 1]包含s[i]的最长的有效匹配括号子串长度。则存在如下关系:...
分类:其他好文   时间:2014-06-04 13:52:03    阅读次数:279
leetcode -day24 Maximum Depth of Binary Tree & Binary Tree Zigzag Level Order Traversal
1、Maximum Depth of Binary Tree Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. clas...
分类:其他好文   时间:2014-06-02 23:13:22    阅读次数:290
Leetcode: Longest Palindromic Substring. java
Given a stringS, find the longest palindromic substring inS. You may assume that the maximum length ofSis 1000, and there exists one unique longest pa...
分类:编程语言   时间:2014-06-02 09:22:03    阅读次数:328
【leetcode】 Longest Substring Without Repeating Characters
题目: 给定一个字符串,返回该串没有重复字符的最长子串。 分析: 1)子串:子串要求是连续的。 2)无重复,出现重复就断了,必须从新的位置开始。而新的位置就是重复字符第一次出现位置的下一个位置。 3)整个串可能没有一处重复。 那么,为了找出当前访问的字符是否出现过,要怎么做呢?当然是hash,O(1)的时间,而且既然是字符, 定义个255的hash table 就可以了,has...
分类:其他好文   时间:2014-06-01 10:48:31    阅读次数:206
【leetcode】Longest Palindromic Substring
题目:给定个字符串,返回chuan...
分类:其他好文   时间:2014-05-31 21:13:29    阅读次数:325
LeetCode: Longest Substring Without Repeating Characters 题解
Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters fo...
分类:其他好文   时间:2014-05-30 23:46:09    阅读次数:453
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