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公式....#include <stdio.h>
#include <math.h>
int main()
{
int n;
int k;
int sum;
while (scanf("%d",&n) && n)
{
k=floor((sqrt(1+8*n)-1)/2);
sum=(6*n-k-k-k*k)*(1+k)/6;
printf("%d %d\n",n,sum);
}
}
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