/in/foo.cc: In function 'int main()':
/in/foo.cc:11:2: error: expected ';' before 'for'
  for(int i = 1; i <= n; i++)
  ^
/in/foo.cc:11:17: error: 'i' was not declared in this scope
  for(int i = 1; i <= n; i++)
                 ^
/in/foo.cc:7:8: warning: unused variable 'm' [-Wunused-variable]
  int n,m,x,y;
        ^
/in/foo.cc:7:10: warning: unused variable 'x' [-Wunused-variable]
  int n,m,x,y;
          ^
/in/foo.cc:7:12: warning: unused variable 'y' [-Wunused-variable]
  int n,m,x,y;
            ^