K-way merge

def mergeA(lijsten: list):
    """
    >>> mergeA([[1, 3, 5], [0, 2, 4], [1, 8, 9, 10, 11]])
    [0, 1, 1, 2, 3, 4, 5, 8, 9, 10, 11]
    >>> mergeA([[1, 10, 20, 100], [99, 101, 200, 400], []])
    [1, 10, 20, 99, 100, 101, 200, 400]
    """
    pass

def mergeB(lijsten: list):
    """
    >>> mergeB([[1, 3, 5], [0, 2, 4], [1, 8, 9, 10, 11]])
    [0, 1, 1, 2, 3, 4, 5, 8, 9, 10, 11]
    >>> mergeB([[1, 10, 20, 100], [99, 101, 200, 400], []])
    [1, 10, 20, 99, 100, 101, 200, 400]
    """
    pass

import heapq

def mergeC(lijsten: list):
    """
    >>> mergeC([[1, 3, 5], [0, 2, 4], [1, 8, 9, 10, 11], []])
    [0, 1, 1, 2, 3, 4, 5, 8, 9, 10, 11]
    >>> mergeC([[1, 10, 20, 100], [99, 101, 200, 400]])
    [1, 10, 20, 99, 100, 101, 200, 400]
    """
    
    pass

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