/in/foo.cc: In function 'int main()':
/in/foo.cc:52:8: warning: unused variable 'cnt' [-Wunused-variable]
    int cnt=0;
        ^~~
/in/foo.cc: In function 'int find(int, int)':
/in/foo.cc:21:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^