Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:13:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int co=0;co<v[nod].size();co++) ^ user.cpp: In function ‘void dfs1(int)’: user.cpp:31:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int co=0;co<v1[nod].size();co++) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:42:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int co=0;co<v1[nod].size();co++) ^ user.cpp: In function ‘int main()’: user.cpp:79:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r[vcc[i].lin].size()>maxim) ^ user.cpp:49:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare.in","r",stdin); ^ user.cpp:50:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare.out","w",stdout); ^ user.cpp:51:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:58:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:88:20: warning: ‘qwq’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs2(r[vcc[qwq].lin][0]); ^