Compilare: user.cpp: In function ‘int main()’: user.cpp:67:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < prieteni.size(); ++i) ^ user.cpp:88:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < prieteni.size(); ++k) ^ user.cpp:92:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t = 0; t < prieteni.size(); ++t) ^ user.cpp:100:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < prieteni.size(); ++j) ^ user.cpp:105:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t = 0; t < prieteni.size(); ++t) ^