Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:17:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<GT[nod].size();i++) ^ user.cpp: In function ‘void sortare_topologica(int)’: user.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘void afis()’: user.cpp:53:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<X.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:79:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[i].size();j++) ^ user.cpp: In function ‘void citire()’: user.cpp:35:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plan.in","r",stdin); ^ user.cpp:37:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:40:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^ user.cpp: In function ‘void afis()’: user.cpp:50:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plan.out","w",stdout); ^