text: int main(int argc,char *argv[])
  {
    double a[20][20];
  
  #pragma omp parallel for 
    for (int i = 0; i <= 19 - 1; i += 1) {
      for (int j = 0; j <= 20 - 1; j += 1) {
        a[i][j] += a[i + 1][j];
      }
    }
    return 0;
  }
  
  