Compilare: user.cpp: In function ‘void back(int)’: user.cpp:19:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[sol[pas-1]].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:32:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&n,&k,&m); ^ user.cpp:34:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^