Compilare: user.cpp: In function ‘void addAllFriendsToQueue(int)’: user.cpp:23:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0, counter = 0; i < V[x].size(); i++){ ^ user.cpp:23:20: warning: unused variable ‘counter’ [-Wunused-variable] for(int i = 0, counter = 0; i < V[x].size(); i++){ ^ user.cpp: In function ‘void markon()’: user.cpp:49:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0, counter = 0; i < V[x].size(); i++){ ^ user.cpp:54:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(V[x].size()-counter < Val[x]) {// ii marchez pe toti ^ user.cpp:58:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0, counter = 0; i < V[x].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:95:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(x = 0; x < Sol.size(); x++){ ^