2799. Count Complete Subarrays in an Array | Leetcode Daily - Python

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Struggling with LeetCode 2799: Count Complete Subarrays in an Array? This video breaks down the problem step-by-step. We define what a 'complete' subarray is (having the same number of distinct elements as the entire array) and walk through examples. Learn why a simple brute-force approach is too slow (O(N^3) or O(N^2)) and dive into the efficient O(N) sliding window solution using Python. Discover how to use two pointers (left and right) and a frequency map (like Python's Counter) to track distinct elements within the window. The key insight is that once a window from left to right is complete, all subarrays starting at left and ending at right or later are also complete, allowing us to add `n - right` to the count efficiently before shrinking the window from the left. We'll go through the Python code implementing this logic and analyze its time and space complexity.

Perfect for coding interview preparation and improving problem-solving skills.

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Solution Link:
https://leetcode.com/problems/count-c...

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