题解 | #[NOIP2015]金币#
[NOIP2015]金币
https://www.nowcoder.com/practice/8f71f5670e6a45118d24d13868a2da9e
#include <stdio.h> int main() { int day,coin=1,sum=0,n,past=0; scanf("%d",&n); for(day=1;day<=n;day++) { past++; sum+=coin; if(past==coin) { past=0; coin++; } } printf("%d",sum); return 0; }