/in/foo.cc: In function 'int main()':
/in/foo.cc:17:19: warning: 'maxn' may be used uninitialized in this function [-Wmaybe-uninitialized]
   int x,y,p,ans=1,maxn;
                   ^~~~
/in/foo.cc:17:11: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
   int x,y,p,ans=1,maxn;
           ^