/in/foo.cc: In function 'int main()':
/in/foo.cc:8:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<s.size();i++)
                 ~^~~~~~~~~
/in/foo.cc:9:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if(s[i]>='1'&&s[i]<='9'||s[i]=='0')