[Problem:1-Two Sum] 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…

题目: Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Please note t…

LeetCode : two sum 第一次写博客,算是熟悉这些编辑环境吧,本来是打算在csdn上用markdown写的,结果改了博客介绍就被关闭了,晕死...好了,话不多说,今天打算拿LeetCode上的第一题:Two Sum来分享试验一下. 题目描述:Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume t…

昨天在leetcode做题的时候做到了371,原题是这样的: 371. Sum of Two Integers Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example: Given a = 1 and b = 2, return 3. 因为之前完全没有在实际练习中使用过位运算,所以刚看到这道题目的时候我的第一反应是 1.用乘除代替加减,但是一想,…

题目链接:Max Sum Plus Plus Plus 题意:在n个数中取m段数使得这m段数之和最大,段与段之间不能重叠 分析:见代码 //dp[i][j]表示前i个数取了j段的最大值 //状态转移:dp[i][j]=max(dp[k][j-1]+(sum[k+l[j]-sum[k]或者sum[i]-sum[i-l[j]) (0<=k<=i-l[j]) // 这种做法是O(n^2)的 //如果改成O(n)的呢? //需要加一个数组max_dp[i][j]表示前i个数取j段的dp最大值 //如果…

ylbtech-SQL-W3School-函数:SQL SUM() 函数 1.返回顶部 1. SUM() 函数 SUM 函数返回数值列的总数(总额). SQL SUM() 语法 SELECT SUM(column_name) FROM table_name SQL SUM() 实例 我们拥有下面这个 "Orders" 表: O_Id OrderDate OrderPrice Customer 1 2008/12/29 1000 Bush 2 2008/11/23 1600 Carter…

问题: 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. Example: Given nums = [2, 7, 11, 15], target = 9, Because nums[0] + nums[1]…

http://acm.hdu.edu.cn/showproblem.php?pid=1024 Max Sum Plus Plus Problem Description Now I think you have got an AC in Ignatius.L's "Max Sum" problem. To be a brave ACMer, we always challenge ourselves to more difficult problems. Now you are fac…

题目: Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example: Given the below binary tree and  sum = 22 , 5 / \ 4 8 / / \ 11 13 4 / \ \ 7 2 1 retu…

Path sum: four ways NOTE: This problem is a significantly more challenging version of Problem 81. In the 5 by 5 matrix below, the minimal path sum from the top left to the bottom right, by moving left, right, up, and down, is indicated in bold red an…