Mã chấm: 95200

Main.cc: In function ‘int main()’:
Main.cc:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < s.length(); i++){
                  ~~^~~~~~~~~~~~
Main.cc:23:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i