Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[x].size(); ++i) ^ user.cpp: In function ‘void DFST(int)’: user.cpp:30:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < GT[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:63:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < sol[i].size(); ++j) fout << sol[i][j] << " "; ^