Problem Description In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n.   Input The input will consist of a series of integers n, one integer per line.   Output For each case, output SUM(n) in one line, followed by a blank line.…

Sum Problem Sample code : #include <stdio.h> int main() { int i,n; int sum; while(scanf("%d",&n)!=EOF) { sum=; ;i<=n;i++) sum+=i; printf("%d\n\n",sum); } ; }…

Sum Problem Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 338086    Accepted Submission(s): 85117 Problem Description Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge). In this pro…

The sum problem Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 31453    Accepted Submission(s): 9414 Problem Description Given a sequence 1,2,3,......N, your job is to calculate all the possib…

The sum problem Time Limit: 5000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 12422 Accepted Submission(s): 3757 Problem Description Given a sequence 1,2,3,......N, your job is to calculate all the possible sub…

Sum Time Limit: 2000/1000MS (Java/Others)Memory Limit: 128000/64000KB (Java/Others) SubmitStatisticNext Problem Problem Description You are given an N*N digit matrix and you can get several horizontal or vertical digit strings from any position. For…

The sum problem Problem Description Given a sequence 1,2,3,......N, your job is to calculate all the possible sub-sequences that the sum of the sub-sequence is M.   Input Input contains multiple test cases. each case contains two integers N, M( 1 <=…

  继续讲故事~~   上次讲到我们的主人公丁丁,用神奇的动态规划法解决了杂货店老板的两个找零钱问题,得到了老板的肯定.之后,他就决心去大城市闯荡了,看一看外面更大的世界.   这天,丁丁刚回到家,他的弟弟小连就拦住了他,"老哥,有个问题想请教你."对于一向数学见长的小连,这次竟然破天荒的来问自己问题,丁丁感到不可思议:他俩一个以计算机见长,一个以数学见长,各自心里都有点小骄傲,不会轻易地向对方问问题.丁丁迟疑了一会儿,慢慢说道:"有什么问题是我们数学小天才解决不了的?&qu…

The partial sum problem 时间限制:1000 ms  |  内存限制:65535 KB 难度:2 描写叙述 One day,Tom's girlfriend give him an array A which contains N integers and asked him:Can you choose some integers from the N integers and the sum of them is equal to K. 输入 There are mul…

I found summary of k Sum problem and solutions in leetcode on the Internet. http://www.sigmainfy.com/blog/summary-of-ksum-problems.html…

https://en.wikipedia.org/wiki/Subset_sum_problem In computer science, the subset sum problem is an important problem in complexity theory and cryptography. The problem is this: given a set (or multiset) of integers, is there a non-empty subset whose…

We have a lot of ways to solve the maximum subsequence sum problem, but different ways take different time. 1.Brute-force algorithm int maxSubSum1(const vector<int> &a) { int maxSum=0; for(int i=0;i<a.size();i++) for(int j=i;j<a.size();j++…

/* Name: NYOJ--927--The partial sum problem Author: shen_渊 Date: 15/04/17 19:41 Description: DFS,和 NYOJ--1058--dfs--部分和问题 基本一致,递归的i+1注意了,其他没什么 */ #include<cstring> #include<iostream> using namespace std; void dfs(int); ],vis[]; int n,k,sum,fla…

聚合函数:sum,count,max,avg等,一般作用于多条记录上.通过group by可以将数据对属于一组的数据起作用. SELECT region, SUM(population), SUM(area)FROM bbc GROUP BY region having子句,汇总之后再筛选.作用于组,从而选择满足条件的组.比如说下面这个,就不能使用where,因为已经分组了,就不能再对一条记录进行操作了. SELECT region, SUM(population), SUM(area) FRO…

原题链接:http://acm.hdu.edu.cn/showproblem.php?pid=2058 思路:等差数列公式变形:sum = a1 * len + len *(len -1)/2 抽象成一句话就是本题的思路:根据数列的长度和数列的和就可以算出首项,因为知道长度,所以区间就出来了(看了好多博客,都没说清楚,晕我一大天……) 然后由式子的变形(2*a1 + len -1)*len  = 2 *sum可得len绝对小于Sqrt(2*sum),因为a1>=1故len-1+2*a1>len…

Ubuntu用sudo apt-get update出错:   E: Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then appstreamcli refresh > /dev/null; fi'   E: Sub-process returned an error code 解决方…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2058 问题描述 给定一个序列1,2,3,...... N,你的工作是计算所有可能的子序列,其子序列的总和为M. 输入 输入包含多个测试用例. 每个情况包含两个整数N,M(1 <= N,M <= 1000000000).输入以N = M = 0结束. 输出  对于每个测试用例,打印其总和为M的所有可能的子序列.格式显示在下面的示例中.在每个测试用例后打印一个空行. 示例输入 20 10 50 30…

Problem C: The Trip Time Limit: 1 Sec  Memory Limit: 64 MBSubmit: 19  Solved: 3[Submit][Status][Web Board] Description The Trip A group of students are members of a club that travels annually to different locations. Their destinations in the past hav…

Problem Description Given a sequence 1,2,3,--N, your job is to calculate all the possible sub-sequences that the sum of the sub-sequence is M. Input Input contains multiple test cases. each case contains two integers N, M( 1 <= N, M <= 1000000000).i…

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…

题目链接:http://acm.nyist.edu.cn/JudgeOnline/problem.php?pid=927 代码: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> #include <algorithm> #include <iostream> using namespace std; int n,k; ]; ; ]…

Problem Description Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge). In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n. Input The input will consist of a series of integers n, one integer per line. Output For each…

The maximum subarray problem is the task of finding the contiguous subarray within a one-dimensional array of numbers (containing at least one positive number) which has the largest sum. For example, for the sequence of values −2, 1, −3, 4, −1, 2, 1,…

时间限制:1 秒 内存限制:32 兆 特殊判题:否 提交:1845 解决:780 题目描述: John von Neumann, b. Dec. 28, 1903, d. Feb. 8, 1957, was a Hungarian-American mathematician who made important contributions to the foundations of mathematics, logic, quantum physics, meteorology, scienc…

Sum Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 10494   Accepted: 6895 Description Consider the natural numbers from 1 to N. By associating to each number a sign (+ or -) and calculating the value of this expression we obtain a sum S…

Problem Description Given a sequence 1,2,3,......N, your job is to calculate all the possible sub-sequences that the sum of the sub-sequence is M.   Input Input contains multiple test cases. each case contains two integers N, M( 1 <= N, M <= 1000000…

题目: 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. For example, 1 / \…

Problem A: The 3n + 1 problem Time Limit: 1 Sec  Memory Limit: 64 MBSubmit: 14  Solved: 6[Submit][Status][Web Board] Description Consider the following algorithm to generate a sequence of numbers. Start with an integer n. If n is even, divide by 2. I…

Problem E: Graphical Editor Time Limit: 1 Sec  Memory Limit: 64 MBSubmit: 2  Solved: 2[Submit][Status][Web Board] Description Graphical editors such as Photoshop allow us to alter bit-mapped images in the same way that text editors allow us to modify…

Problem D: LC-Display Time Limit: 1 Sec  Memory Limit: 64 MBSubmit: 14  Solved: 3[Submit][Status][Web Board] Description A friend of yours has just bought a new computer. Before this, the most powerful machine he ever used was a pocket calculator. He…