Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:34:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < L[node].size(); i++) { ^ user.cpp: In function ‘void solve()’: user.cpp:54:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int it = 0; it < L[node].size(); it++) { ^ user.cpp:66:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < T[child].size(); j++) { ^