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hdu 1001 Sum Problem
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.
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
1100
Sample Output
15050
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
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