Compilare: user.cpp: In function ‘int main()’: user.cpp:75:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < moments[i].size(); j++) { ^ user.cpp:80:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < moments[i].size() - 1; j++) ^ user.cpp:90:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < moments[i].size(); j++) ^