题解 | #[NOIP2015]金币#
[NOIP2015]金币
https://www.nowcoder.com/practice/8f71f5670e6a45118d24d13868a2da9e
#include<stdio.h>
int main()
{
int k=0,sum=0,i=1,date=0;
scanf("%d",&k);
while (date<k)
{
date+=i;
sum+=i*i;
i++;
}
date==k?printf("%d",sum):printf("%d",sum+(k-date)*(i-1));
return 0;
}
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