Help Johnny(类似杭电3568题) Description Poor Johnny is so busy this term. His tutor threw lots of hard problems to him and demanded him to accomplish those problems in a month. What a wicked tutor! After cursing his tutor thousands of times, Johnny real…
最近在尝试做acm试题,刚刚是1001题就把我困住了,这是题目: Problem Description 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…