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:82:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[x].size(); ++i) ^ user.cpp:92:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[f].size(); ++i) ^ user.cpp:110:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[x].size(); ++i) ^ user.cpp:119:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[x].size(); ++i) ^ user.cpp:129:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[f].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:177:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<ans.size(); ++i) ^