/in/foo.cc: In function 'int main()':
/in/foo.cc:22:27: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   22 |                 if(P(mid=L+R>>1))
      |                          ~^~
/in/foo.cc:27:15: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
   27 |         printf("%d",ans);
      |         ~~~~~~^~~~~~~~~~
/in/foo.cc:19:23: note: 'ans' was declared here
   19 |         int L=0,R=INF,ans,mid;
      |                       ^~~