| Вход | Ожидаемый результат |
|---|---|
| [[3, 9, 20, null, null, 15, 7]] | true |
| [[1, 2, 2, 3, 3, null, null, 4, 4]] | false |
| [[]] | true |
| [[1]] | true |
| [[1, 2, null, 3, null, 4]] | false |
| [[1, 2, 3]] | true |
| [[1, 2, 3, 4, 5, 6, 7]] | true |
| [[1, 2, null, 3, null, null, null, 4]] | false |
| [[5, 3, 8, 1, 4, 7, 9]] | true |
| [[1, 2, 3, 4]] | true |