Compilare: user.cpp: In function ‘void DFS(int, int, int)’: user.cpp:23:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G[Node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:80:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < Cm.size();i++) ^ user.cpp:87:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < Ar.size();i++) ^ user.cpp:54:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pamant.in","r",stdin); ^ user.cpp:55:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pamant.out","w",stdout); ^ user.cpp:57:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&N,&M); ^ user.cpp:66:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&A,&B); ^