/in/foo.cc: In function 'int main()':
/in/foo.cc:46:9: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   printf("%d\n",ans);
   ~~~~~~^~~~~~~~~~~~
/in/foo.cc:41:7: note: 'ans' was declared here
   int ans;
       ^~~