Compilare: user.cpp: In function ‘void dfs1(int, int)’: user.cpp:56:9: warning: unused variable ‘pos’ [-Wunused-variable] int pos = 0, sz = nodes[nod].size(); ^~~ user.cpp: In function ‘int main()’: user.cpp:87:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^ user.cpp:90:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&x,&y); ^ user.cpp:95:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&vals[i]); ^