Question: Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example, "A man, a plan, a canal: Panama" is a palindrome. "race a car" is not a palindrome.Example Questions C…

Validate if a given string is numeric. Some examples:"0" => true" 0.1 " => true"abc" => false"1 a" => false"2e10" => true 解决方案: public class Solution { public boolean isNumber(String s) { in…

因为最近一段时间接触了一些Leetcode上的题目,发现许多题目的解题思路相似,从中其实可以了解某类算法的一些应用场景. 这个随笔系列就是我尝试的分析总结,希望也能给大家一些启发. 动态规划的基本概念 一言以蔽之,动态规划就是将大问题分成小问题,以迭代的方式求解. 可以使用动态规划求解的问题一般有如下的两个特征: 1.有最优子结构(optimal substructure) 即待解决问题的最优解能够通过求解子问题的最优解得到. 2.子问题间有重叠(overlapping subproplems)…

Leetcode里面关于字符串的一些问题,描述如下: Given an input string, reverse the string word by word. For example,Given s = "the sky is blue",return "blue is sky the". Update (2015-02-12):For C programmers: Try to solve it inO(1) space. click to show cla…

问题描述: 在股市的交易日中,假设最多可进行两次买卖(即买和卖的次数均小于等于2),规则是必须一笔成交后进行另一笔(即买-卖-买-卖的顺序进行).给出一天中的股票变化序列,请写一个程序计算一天可以获得的最大收益.请采用实践复杂度低的方法实现. 给定价格序列prices及它的长度n,请返回最大收益.保证长度小于等于500. class Solution { public: int maxProfit(vector<int>& prices) { //It's wrong if you c…

Question: Find the contiguous subarray within an array (containing at least one number) that has the largest sum. For example, given the array [2, 1, –3, 4, –1, 2, 1, –5, 4], The contiguous array [4, –1, 2, 1] has the largest sum = 6. 此问题提供了两种解决方案,首先…

Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the length is 3. Given "bbbbb", the answer is "b", with the length of 1.…

Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 注:直接看题目可能会有些偏差,因为容易认为 needle是一个字符,那就也太容易了,实则,haystack和needle都是字符串(注意是字符串不是数组) 解法思路: 暴力搜索: public class Solution { public int…

class Solution { public: vector<pair<int, int>> getSkyline(vector<vector<int>>& buildings) { vector<pair<int, int> > h, res; multiset<int> m; , cur = ; for (auto &a : buildings) { h.push_back({a[], -a[]});…

不多说,直接上干货! 前期博客 apache-storm-0.9.6.tar.gz的集群搭建(3节点)(图文详解) apache-storm-1.0.2.tar.gz的集群搭建(3节点)(图文详解)(非HA和HA)  问题详情 org.apache.storm.utils.NimbusLeaderNotFoundException: Could not find leader nimbus from seed hosts ["master"]. Did you specify a va…