/in/foo.cc: In function 'int main()':
/in/foo.cc:25:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i<input.size(); i++)
                    ~^~~~~~~~~~~~~
/in/foo.cc:38:16: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
         else if(w == 11 || l == 11)
                ^
/in/foo.cc:68:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i<input.size(); i++)
                    ~^~~~~~~~~~~~~
/in/foo.cc:81:16: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
         else if(w == 21 || l == 21)
                ^