/in/foo.cc: In function 'int main()':
/in/foo.cc:49:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < s.size(); i++) {
                 ~~^~~~~~~~~~
/in/foo.cc:52:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(j = i + 1; j < s.size() && s[j] >= '0' && s[j] <= '9'; j++)
                   ~~^~~~~~~~~~
/in/foo.cc: In function 'int get(int, char, int)':
/in/foo.cc:21:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^