Compilare: user.cpp: In function ‘int main()’: user.cpp:34:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < key_word.size(); i++) ^ user.cpp:53:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < key_word.size(); i++) ^ user.cpp:72:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = int(key_word.size()); i < text.size(); i++) ^