Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:58:42: 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:22:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&N,&K); ^ user.cpp:25:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&a,&b); ^