#include<stdio.h> int main() { long long sum,i,m; while(scanf("%d",&m)!=EOF) { printf("%ld/n/n",m*(m+1)/2); } }
读懂题目是成功的一半
posted on 2010-07-18 16:31 草头菜 阅读(94) 评论(0) 编辑 收藏 举报
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