/in/foo.cc: In function 'int main()':
/in/foo.cc:10:24: error: 'memset' was not declared in this scope
  memset(a, 0, sizeof(a));
                        ^
/in/foo.cc:27:6: warning: unused variable 'min_x' [-Wunused-variable]
  int min_x = 0;
      ^~~~~
/in/foo.cc:28:6: warning: unused variable 'min_y' [-Wunused-variable]
  int min_y = 0;
      ^~~~~
/in/foo.cc:29:6: warning: unused variable 'min' [-Wunused-variable]
  int min = 1999999999;
      ^~~