Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:14:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<g[nod].size();i++) ^ user.cpp: In function ‘void dfst(int)’: user.cpp:22:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<gt[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:53:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<ctc[i].size();j++) ^ user.cpp:29:32: 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:30:34: 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:32:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:35:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^