he-026

1.000

1/1 tests· basic

Proposed solution

```python
from typing import List


def remove_duplicates(numbers: List[int]) -> List[int]:
    """ From a list of integers, remove all elements that occur more than once.
    Keep order of elements left the same as in the input.
    >>> remove_duplicates([1, 2, 3, 2, 4])
    [1, 3, 4]
    """
    # Count occurrences of each number
    count = {}
    for num in numbers:
        count[num] = count.get(num, 0) + 1
    
    # Filter out numbers that occur more than once
    result = []
    for num in numbers:
        if count[num] == 1:
            result.append(num)
    
    return result
```

Test output (stdout)

.                                                                        [100%]
1 passed in 0.01s

System prompt

You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.