/in/foo.cc: In function 'int main()':
/in/foo.cc:40:11: warning: variable 'now' set but not used [-Wunused-but-set-variable]
       int now;
           ^~~
/in/foo.cc:33:10: warning: unused variable 'cnt' [-Wunused-variable]
      int cnt=0;ans=0;
          ^~~