/in/foo.cc: In function 'int initial(int)':
/in/foo.cc:21:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'long long int prim(int)':
/in/foo.cc:74:19: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized]
         visit[ind]=true;
         ~~~~~~~~~~^~~~~