Check Consecutive Numbers

Write a Python function `check_consecutive(lst)` that checks whether the given list contains consecutive numbers or not. A list is considered to have consecutive numbers if all the numbers in the list can be arranged in a sequence where each number is exactly one greater than the previous one.

#### Function Signature
```python [main.nopy]
def check_consecutive(lst: list) -> bool:
```

#### Input
- `lst`: A list of integers.

#### Output
- Returns `True` if the list contains consecutive numbers, otherwise `False`.

#### Examples
```python [main.nopy]
check_consecutive([1, 2, 3, 4, 5])  # Output: True
check_consecutive([1, 2, 4, 5])     # Output: False
check_consecutive([3, 2, 1])        # Output: True
check_consecutive([1, 1, 2])        # Output: False
```

def check_consecutive(lst: list) -> bool:
    """
    Check if the given list contains consecutive numbers.

    Args:
    lst (list): A list of integers.

    Returns:
    bool: True if the list contains consecutive numbers, False otherwise.
    """
    # Your code here
    pass

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