Compilare: user.cpp: In function ‘int main()’: user.cpp:16:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<s.size(); i++){ ^ user.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=sir.size(); i++){ ^ user.cpp:40:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=intrare; j<=sir.size(); j++){ ^ user.cpp:58:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<sir.size(); i+=2){ ^