006.cpp

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#include <iostream>
using namespace std;
int
main ()
{
  unsigned sq_of_sum = 100 * (100 + 1) / 2;
  sq_of_sum *= sq_of_sum;

  unsigned sum_of_sq = 0;
  for (int i = 1; i <= 100; i++)
    sum_of_sq += i * i;

  cout << (sq_of_sum - sum_of_sq) << endl;
  return 0;
}