hdu 2050折线分割平面

#include <stdio.h> int main() { int n,i; __int64 a[100001]; a[1] = 2; a[2] = 7; for(i = 3;i <= 10000;i ++) { a[i] = a[i-1]+2 * (2 * (i-1)+1)-1; } scanf("%d",&n); while(n--) { scanf("%d",&i); printf("%I64d\n",a[i]); } return 0; }