$solve$ 后面的输出注释掉之后 $solve$ 也没有输出了

void solve(int u)
{
    push_down(u);
    if(ls(u))
    {
        solve(ls(u));
    }
    //cout << 1 << endl;
    printf("%d " , tr[u].val);
    if(rs(u))
    {
        solve(rs(u));
    }
    return ;
}
signed main()
{
    int n , m;
    scanf("%d%d" , &n , &m);
    for(int i = 1 ; i <= n ; i ++)
    {
        //cout << i << endl;
        insert(i);
    }
    solve(rt);
    cout <<"bbb" << endl;
    return 0;
}