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hdu 1001 Sum Problem

时间:2017-07-13 19:41:30      阅读:207      评论:0      收藏:0      [点我收藏+]

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 480655    Accepted Submission(s): 121603


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
 

 

屠龙宝刀点击就送

#include <cstdio>
int n;
int main()
{
    while(scanf("%d",&n)!=EOF)
    {
        if(n%2==1) printf("%d\n\n",(n/2)*(1+n)+(n/2)+1);
        else printf("%d\n\n",(n/2)*(1+n)); 
    }
}

 

hdu 1001 Sum Problem

原文:http://www.cnblogs.com/ruojisun/p/7162023.html

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