/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:17:9: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(x=0) x=n;
         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:25:20: warning: too many arguments for format [-Wformat-extra-args]
  scanf("&d&d",&n,&m);
                    ^