问题描写叙述:在一个数组(无序)中高速找出两个数字,使得两个数字之和等于一个给定的值.如果数组中肯定存在至少一组满足要求. <剑指Offer>P214(有序数组) <编程之美>P176 Que:Given an array of integers, find twonumbers such that they add up to a specific target number. The function twoSum should return indices ofthe…

题目 :Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution.  (Easy) 解法1: Two pointers 拷贝一份,将数组排序,两根指针分别从前后向中间扫描,找到解为止.再遍历原数组寻找下标添加到结果内.…

能够用递归简洁的写出,可是会超时. dp嘛.这个问题须要从后往前算,最右下角的小规模是已知的,边界也非常明显,是最后一行和最后一列,行走方向的限制决定了这些位置的走法是唯一的,能够先算出来.然后不断的往前推算. 用distance[i][j]保存从当前位置走到最右下角所需的最短距离,状态转移方程是从distance[i+1][j]和distance[i][j+1]中选一个小的,然后再加上自身的. 代码非常easy理解,这就是dp的魅力.空间上是能够优化的,由于当前状态仅仅与后一行和后一列有关系.…

Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the sameelement twice. Example: Given nums = [2, 7, 11, 15],…

［抄题］: Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which represents the number 123. Find the total sum of all root-to-leaf numbers. Note: A leaf is…

［抄题］: 以字符串的形式给出两个非负整数 num1 和 num2,返回 num1和 num2 的和. 比如一个50位+一个100位. 给定 num1 = "123",num2 = "45" 返回 "168" [暴力解法]: 时间分析: 空间分析: ［思维问题］: ［一句话思路］: ［输入量］:空: 正常情况:特大:特小:程序里处理到的特殊情况:异常情况(不合法不合理的输入): ［画图］: ［一刷］: sum求和或者循环退出的条件都是i j &g…

感觉有必要重新刷刷题了,为以后找工作做做准备,选择LeetCode+topcoder上的Data Science Tutorials, 争取每天晚上10:00开始刷一道,复习一下相关知识点. -------------------------------------------------------分割线啦----------------------------------------------------------------------- Two Sum Given an array…

这一段时间一直都在刷OJ,这里建一个博客合集,用以记录和分享算法学习的进程. github传送门:https://github.com/haoyuanliu/Online_Judge/tree/master/HangDianOJ   Problem Description In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n. Input The input will consist of a series…

由于深深的知道自己是事件驱动型的人,一直想补强自己的薄弱环节算法,却完全不知道从哪里入手.所以只能采用最笨的办法,刷题.从刷题中遇到问题就解决问题,最后可能多多少少也能提高一下自己的渣算法吧. 暂时的目标是一周最少两道,可能会多做多想,工作再忙也会完成这个最低目标. Two sum: Given an array of integers, return indices of the two numbers such that they add up to a specific target. Y…

1. Two Sum 两数之和 Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. Example: Given nums…