/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:47:28: error: 'm' was not declared in this scope
    printf("%d ", getVal(n, m, i, j));
                            ^