Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:28:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G1[node].size(); ++i) ^ user.cpp: In function ‘void DFT(int, bool)’: user.cpp:41:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G2[node].size(); ++i) ^ user.cpp: In function ‘void read()’: user.cpp:18:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:49:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in","r",stdin); ^ user.cpp:50:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out","w",stdout); ^ user.cpp:54:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &m); ^