2226. Divide Array Into Equal Pairs | Leetcode Daily - Python
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In this video, we tackle LeetCode problem 2206, "Divide Array Into Equal Pairs." We're given an integer array, `nums`, with an even number of elements, and our goal is to determine if we can divide it into pairs where the elements in each pair are equal. We explore three different approaches to solve this. First, we use a sorting-based solution, where we sort the array and then check adjacent elements for equality. Next, we implement a more efficient hash map approach, counting the frequency of each number and ensuring all frequencies are even. Finally, we leverage the problem constraints (numbers are between 1 and 500) to use a fixed-size array as a hash map, offering constant space complexity. We analyze the time and space complexity of each approach, highlighting the trade-offs between them.
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Solution Link:
https://leetcode.com/problems/divide-...
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