Leetcode Problem 2799. Count Complete Subarrays in an Array

2799. Count Complete Subarrays in an Array

Leetcode Solutions

Sliding Window Approach

  1. Calculate the total number of distinct elements in the array.
  2. Initialize a frequency dictionary to keep track of the occurrences of elements in the current window.
  3. Use two pointers, left and right, to represent the window's bounds.
  4. Expand the window by moving right to include new elements and update their frequency in the dictionary.
  5. If the window becomes complete (i.e., contains all distinct elements), increment the result by n - right to account for all subarrays starting at left and ending at or after right.
  6. Contract the window by moving left forward, decrementing the frequency of the element at left, and removing it from the dictionary if its frequency drops to zero.
  7. Repeat steps 4-6 until right reaches the end of the array.
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Brute Force Approach

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