/in/foo.cc: In function 'int main()':
/in/foo.cc:44:28: warning: variable 'num' set but not used [-Wunused-but-set-variable]
  int C, R, n, i, high = 0, num = 0, Max = 0;
                            ^~~
/in/foo.cc:44:37: warning: variable 'Max' set but not used [-Wunused-but-set-variable]
  int C, R, n, i, high = 0, num = 0, Max = 0;
                                     ^~~