Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:33:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < G[nod].size() ; i ++ ) ^ user.cpp: In function ‘void Fake_DFS(int, int)’: user.cpp:45:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < F[nod].size() ; i ++ ) ^ user.cpp: In function ‘void Solve()’: user.cpp:66:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0 ; j < SOL[i].size() ; j ++ ) ^ user.cpp: In function ‘void Read()’: user.cpp:22:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d" , &n , &m ); ^ user.cpp:25:61: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d" , &x , &y ) , G[x].pb(y) , F[y].pb(x); ^ user.cpp: In function ‘int main()’: user.cpp:76:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN,"r",stdin); ^ user.cpp:77:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT,"w",stdout); ^