hdu 1001 Sum Problem
Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 342001 Accepted Submission(s): 86236
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.
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. You may
assume the result will be in the range of 32-bit signed integer.
Sample Input
1
100
Sample Output
1
5050
题意：求1到n的和
#include<iostream> using namespace std; int main(){ int a,b,c; while(cin>>a){ c=0; for(b=1;b<=a;b++) c+=b; cout<<c<<endl<<endl; } return 0; }