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