1001：Sum Problem

题目描述
Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge).

In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n.
输入解释
The input will consist of a series of integers n, one integer per line.
输出解释
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.
输入样例 
1
100
输出样例 
1

5050
来自杭电HDUOJ的附加信息
Author DOOM III
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该题目是Virtual Judge题目，来自 杭电HDUOJ
源链接： HDU-1001
最后修改于 2020-10-25 22:41:17 UTC 由爬虫自动更新
共提交 129 次
通过率 48.06%
时间上限 内存上限
1000/500MS(Java/Others) 65536/32768K(Java/Others)

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