Compilare: user.cpp: In function ‘int main()’: user.cpp:68:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < le.size(); i++){ ^ user.cpp:75:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ue.size(); i++) ^ user.cpp:85:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ue.size(); i++){ ^ user.cpp:91:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < le.size(); i++) ^