/in/foo.cc: In function 'int main()':
/in/foo.cc:5:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.length();i++){
               ^
/in/foo.cc:6:14: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   cout<<(s[i]&1>0?"0":"1");
              ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:18:5: error: redefinition of 'int main()'
 int main(){
     ^
/in/foo.cc:3:5: note: 'int main()' previously defined here
 int main(){
     ^