Leetcode Problem 2444. Count Subarrays With Fixed Bounds

2444. Count Subarrays With Fixed Bounds

Leetcode Solutions

Key approach of the solution: Two Pointers

  1. Initialize minPosition, maxPosition, and leftBound to -1, and answer to 0.
  2. Iterate over the array nums using an index i.
    • If nums[i] is outside the [minK, maxK] range, update leftBound to i.
    • If nums[i] equals minK, update minPosition to i.
    • If nums[i] equals maxK, update maxPosition to i.
    • Calculate the number of valid subarrays ending at i as max(0, min(minPosition, maxPosition) - leftBound).
    • Add this number to answer.
  3. Return answer after the iteration is complete.
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Alternative approach of the solution: Brute Force

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