Compilare: user.cpp: In function ‘int bf()’: user.cpp:19:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:61:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(fi,"%d%d",&n,&m); ^ user.cpp:63:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d",&x,&y,&z); ^