Compilare: user.cpp: In function ‘void DFS1(int)’: user.cpp:28:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[k].size(); i++) ^ user.cpp: In function ‘void DFS2(int)’: user.cpp:37:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < H[k].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:68:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < S[i].size();fout << S[i][j] << " ", j++); ^