/in/foo.cc: In function 'int main()':
/in/foo.cc:17:8: warning: statement has no effect [-Wunused-value]
    l%10==x;
    ~~~~^~~
/in/foo.cc:20:8: warning: statement has no effect [-Wunused-value]
    l%10==x;
    ~~~~^~~
/in/foo.cc:24:8: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<ans<<endl;
        ^~~