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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); } } Followed by: Post your reply here: |
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