Compilare: user.cpp: In function ‘void probe_dfs(int, int)’: user.cpp:29:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[x].size(); ++i) ^ user.cpp:38:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[x].size(); ++i) ^ user.cpp: In function ‘void real_dfs(int, int)’: user.cpp:83:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[x].size(); ++i) ^ user.cpp:93:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[f].size(); ++i) ^ user.cpp:111:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[x].size(); ++i) ^ user.cpp:120:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<Mod0[x].size(); ++i) ^ user.cpp:126:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<Mod1[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:170:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<ans.size(); ++i) ^