题目: 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. 思路: 刚开始做写了一个尺取法,脑抽的一批.(这几天心情真的是颓的很,连带脑瓜也不好用了,抓紧调整~~~~) 其实可以根据等差数列求和公式求出这个子序列的长度的一个大致的范围为k=sqrt(2*m),然后根据m和k求出首项a1,然后将a1

  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 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

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

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): 12422 Accepted Submission(s): 3757 Problem Description Given a sequence 1,2,3,......N, your job is to calculate all the possible sub

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++

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 <=

/* 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

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); } ; }

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

Given an array of n positive integers and a positive integer s, find the minimal length of a subarray of which the sum ≥ s. If there isn't one, return 0 instead. For example, given the array [2,3,1,2,4,3] and s = 7,the subarray [4,3] has the minimal

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

一.题目 http://acm.wust.edu.cn/problem.php?id=1192&soj=0 二.分析 要求从序列1,2,3,,,N,中截取一部分使他们的和为M 输入多组数据 输入0 0结束 每组数据结束有一个空行 三.思路 定义i,j,且1<=i<=j<=N,计算从i至j的数据的和sum,sum=(i+j)*(j-i+1)/2,sum与M比较,若相等则输出i,j.当输入100000 100000时,运行的时间较长(我没提交不知道有没有超时). 改进一下,1<

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

传送门 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