贪心:尽量将gas[i]-cost[i]>0的放在前面,gas[i]-cost[i]<0的放在后面.(路程的前面有汽油剩下,耗汽油的放在路程的后面). 能否全程通过的 条件 是:sum(gas[i])>=sum(cost[i]),不满足这个条件就不能全程走一遍: 起点 i 满足的 必要 条件 是:额外剩下的gas(additional_gas)要大于等于0,即 gas[i]-cost[i]>=0: 另外需满足: 找出某站点 i_save ,经过这个站点剩下的gas最多,找出某站点…

本文为senlie原创.转载请保留此地址:http://blog.csdn.net/zhengsenlie Best Time to Buy and Sell Stock Total Accepted: 13234 Total Submissions: 43145 Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to…

贪心算法中,是以自顶向下的方式使用最优子结构,贪心算法会先做选择,在当时看起来是最优的选择,然后再求解一个结果的子问题. 贪心算法是使所做的选择看起来都是当前最佳的,期望通过所做的局部最优选择来产生一个全局最优解 如最小生成树.Dijkstra单源最短路径 动态规划:https://www.cnblogs.com/AntonioSu/p/11864508.html 分治算法:https://www.cnblogs.com/AntonioSu/p/11865159.html…

1. jump game Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maximum jump length at that position. Determine if you are able to reach the last index. For…

Best Time to Buy and Sell Stock II Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete as many transactions as you like (ie, buy one and sell one sha…

先看一道leetcode题: Best Time to Buy and Sell Stock II Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete as many transactions as you like (ie, buy one a…

45. Jump Game II 题目链接:https://leetcode.com/problems/jump-game-ii/ Description: Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maximum jump length at tha…

Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maximum jump length at that position. Your goal is to reach the last index in the minimum number of jumps…

给定 n 个非负整数 a1,a2,...,an,每个数代表坐标中的一个点 (i, ai) .在坐标内画 n 条垂直线,垂直线 i 的两个端点分别为 (i, ai) 和 (i, 0).找出其中的两条线,使得它们与 x 轴共同构成的容器可以容纳最多的水. 说明:你不能倾斜容器,且 n 的值至少为 2. 图中垂直线代表输入数组 [1,8,6,2,5,4,8,3,7].在此情况下,容器能够容纳水(表示为蓝色部分)的最大值为 49. 示例: 输入: [1,8,6,2,5,4,8,3,7]输出: 49 来源…

贪心 455分发饼干 假设你是一位很棒的家长,想要给你的孩子们一些小饼干.但是,每个孩子最多只能给一块饼干.对每个孩子 i ,都有一个胃口值 gi ,这是能让孩子们满足胃口的饼干的最小尺寸:并且每块饼干 j ,都有一个尺寸 sj .如果 sj >= gi ,我们可以将这个饼干 j 分配给孩子 i ,这个孩子会得到满足.你的目标是尽可能满足越多数量的孩子,并输出这个最大数值. 注意: 你可以假设胃口值为正. 一个小朋友最多只能拥有一块饼干. 示例 1: 输入: [1,2,3], [1,1] 输出:…