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