Compilare: user.cpp: In function ‘int main()’: user.cpp:34:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i <= word.size() - 1; i++) ^ user.cpp:53:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i <= word.size() - 1; i++) ^