/in/foo.cc: In function 'void zheng()':
/in/foo.cc:11:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(ans[i]==1 && a[i]==3 || ans[i]==3 && a[i]==1) ans[i]=2;
        ~~~~~~~~~~^~~~~~~~~~
/in/foo.cc:21:23: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(lans>2 || lans==2 && ans[2]>n/10 || lans==2 && ans[2]==n/10 && ans[1]>n%10) {book=0;return;}
               ~~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc:21:65: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(lans>2 || lans==2 && ans[2]>n/10 || lans==2 && ans[2]==n/10 && ans[1]>n%10) {book=0;return;}
                                         ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:68:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(j=0;j<st.size();j++)
           ~^~~~~~~~~~