请输入层数：10
1
        23
       456
      7891
     23456
    789123
   4567891
  23456789
 123456789
1234567891
cout << "请输入层数：";
cin >> N;

K = 1;

for (i = 1; i < N + 1; i++){
    for (int _ = 1; _ < ___________; _++)
        cout << " ";

    for (int _ = 1; _ < ________; _++){
        cout << K;

        K += 1;
        if (K == 10)
            K = 1;
    }
    cout << '\n';
}