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;
}
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