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from typing import List


def twoSum(nums: List[int], target: int) -> List[int]:
    """
    Finds two numbers in a list that sum up to the target value.

    Args:
        nums (List[int]): A list of integers.
        target (int): The target value.

    Returns:
        List[int]: A list containing the indices of the two numbers that sum up to the target.

    Examples:
        >>> nums = [2, 7, 11, 15]
        >>> target = 9
        >>> result = twoSum(nums, target)
        >>> print(result)
        [0, 1]
    """
    max_index = len(nums) - 1
    start, end = 0, 1
    while start != end:
        if nums[start] + nums[end] == target:
            break
        
        # Setting up next iteration
        if end < max_index:
            end += 1
        elif start < max_index:
            start += 1
            end = start + 1

    return start, end

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from typing import List


def twoSum(nums: List[int], target: int) -> List[int]:
    """
    Finds two numbers in a list that sum up to the target value.

    Args:
        nums (List[int]): A list of integers.
        target (int): The target value.

    Returns:
        List[int]: A list containing the indices of the two numbers that sum up to the target.

    Examples:
        >>> nums = [2, 7, 11, 15]
        >>> target = 9
        >>> result = twoSum(nums, target)
        >>> print(result)
        [0, 1]
    """
    summands = {}
    for i, number in enumerate(nums):
        if number in summands:
            break
        summands[target - number] = i
    return summands[number], i