Compilare: user.cpp: In function ‘void Solve(int)’: user.cpp:55:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < GT[x].size(); i++) ^ user.cpp:71:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[x].size(); i++) ^ user.cpp:84:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < GT[x].size(); i++) ^