Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:42:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<G[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:18:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d %d",&N,&M,&X,&Y); ^ user.cpp:22:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&a,&b,&c); ^