c program for given an n x n square matrix, find sum of all sub-squares of size k x k

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// Size of given matrix #define n 5 // A simple function to find sum of all sub-squares of size k x k // in a given square matrix of size n x n void printSumSimple(int mat[][n], int k) {    // k must be smaller than or equal to n    if (k > n) return;    // row number of first cell in current sub-square of size k x k    for (int i=0; i<n-k+1; i++)    {       // column of first cell in current sub-square of size k x k       for (int j=0; j<n-k+1; j++)       {           // Calculate and print sum of current sub-square           int sum = 0;           for (int p=i; p<k+i; p++)              for (int q=j; q<k+j; q++)                  sum += mat[p][q];            cout << sum << "  ";       }       // Line separator for sub-squares starting with next row       cout << endl;    } } // Driver program to test above function int main() {     int mat[n][n] = {{1, 1, 1, 1, 1},                      {2, 2, 2, 2, 2},                      {3, 3, 3, 3, 3},                      {4, 4, 4, 4, 4},                      {5, 5, 5, 5, 5},                     };     int k = 3;     printSumSimple(mat, k);     return 0; }