Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:12:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[k].size();i++) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:21:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gt[k].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:56:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<comp[i].size();j++) ^ user.cpp:27:32: 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:28:34: 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:29:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:32:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&i,&j); ^