/in/foo.cc: In function 'int main()':
/in/foo.cc:25:12: warning: '<<' in boolean context, did you mean '<' ? [-Wint-in-bool-context]
    if(i&&(1<<j))
          ~~^~~~
/in/foo.cc:29:15: warning: '<<' in boolean context, did you mean '<' ? [-Wint-in-bool-context]
      if((i&&(1<<k))&&(j!=k))
             ~~^~~~