/in/foo.cc: In function 'int main()':
/in/foo.cc:9:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 1; i < s.length(); i += 2) {
              ~~^~~~~~~~~~~~
/in/foo.cc:10:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if (s[i] != '#' && s[i + 1] == '#' || s[i + 1] != '#' && s[i] == '#' || s[i + 1] == '\0') {
                    
/in/foo.cc:15:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (i >= s.length()) printf ("Yes\n");
      ~~^~~~~~~~~~~~~