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Algorithms & data structures

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Algorithms & data structures easy

Find Elements Appearing More Than n/3 Times in Python

Return all elements that occur more than len(array)/3 times using a simple dictionary counter.

majority-element dictionary counting
Python 
def majority_third(arr):
    """Return elements appearing more than len(arr)/3 times."""
    cutoff = len(arr) / 3
    counts = {}
    for x in arr:
        counts[x] = counts.get(x, 0) + 1
    return [x for x, c in counts.items() if c > cutoff]


if __name__ == "__main__":
    test1 = [3, 2, 3]
    test2 = [1, 1, 1, …
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