Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:25:8: warning: statement has no effect [-Wunused-value] for (q; q != NULL; q = q->next) ^ user.cpp: In function ‘int main()’: user.cpp:61:11: warning: statement has no effect [-Wunused-value] for (q; q != NULL; q = q->next) ^ user.cpp:38:20: warning: unused variable ‘j’ [-Wunused-variable] int x, y, N,M, i, j, T,level=0,ok; ^