Python - Use Hash Tables (Dictionaries) for Fast Data Retrieval

Hash tables, often implemented as dictionaries in Python, are a fundamental data structure for efficiently storing and retrieving data. They provide constant-time average-case lookup, insertion, and deletion operations, making them valuable for various applications. Here's an example:

def count_elements(arr):
    element_count = {}  # Create an empty dictionary to store counts

    for element in arr:
        if element in element_count:
            element_count[element] += 1  # Increment count if element exists
        else:
            element_count[element …

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