/in/foo.cc: In function 'long long int getVal(int, int, int, int)':
/in/foo.cc:11:12: warning: unused variable 'len' [-Wunused-variable]
  long long len = max(1LL, rn - 2LL * (level + cn - 2 * level - 2) * 2LL);
            ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:47:36: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
    printf("%d ", getVal(n, n, i, j));
                                    ^