Sum Problem

原创于 2019-01-29 22:03:47 发布 · 137 阅读

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本文详细解析了HDOJ平台上的经典编程题——求和问题，介绍了解题思路和算法实现，通过实例演示了如何计算从1到n的累加和。

http://acm.hdu.edu.cn/showproblem.php?pid=1001

Sum Problem

Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 606504 Accepted Submission(s): 153369

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 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

Author

DOOM III


#include<stdio.h>

int main()
{
	int n,sum;
	while(scanf("%d",&n)!=EOF)
	{
		sum=0;
		while(n)
		{
			sum+=n;
			n--;
		}
		printf("%d\n\n",sum);
	}
	return 0;
}