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Check if List is Sorted

Write a Python function `is_sorted(lst)` that checks whether a given list of numbers is sorted in ascending order. The function should return `True` if the list is sorted and `False` otherwise.

#### Example Usage:
```python [main.nopy]
print(is_sorted([1, 2, 3, 4, 5]))  # Output: True
print(is_sorted([5, 3, 2, 1]))    # Output: False
print(is_sorted([1, 1, 2, 2]))    # Output: True
```

#### Constraints:
- The input list will only contain numeric values.
- An empty list or a list with a single element is considered sorted.
def is_sorted(lst):
    """
    Check if the given list is sorted in ascending order.

    Args:
        lst (list): The list of numbers to check.

    Returns:
        bool: True if the list is sorted, False otherwise.
    """
    # Placeholder for the solution
    pass