/in/foo.cc: In function 'int main()':
/in/foo.cc:20:9: warning: 'index' may be used uninitialized [-Wmaybe-uninitialized]
   20 |         if(i == index)continue;
      |         ^~
/in/foo.cc:4:11: note: 'index' was declared here
    4 |     int n,index,p = 1;
      |           ^~~~~