Leetcode Problem 2302. Count Subarrays With Score Less Than K

2302. Count Subarrays With Score Less Than K

Leetcode Solutions

Sliding Window Approach

  1. Initialize two pointers left and right to 0, which will represent the bounds of the sliding window.
  2. Initialize windowSum to 0, which will keep track of the sum of elements within the window.
  3. Initialize valid to 0, which will count the number of valid subarrays.
  4. Iterate with the right pointer over the array, adding the current element to windowSum.
  5. If the score of the current window (windowSum * (right - left + 1)) is greater than or equal to k, shrink the window from the left by subtracting the left element from windowSum and incrementing left.
  6. For each position of right, add the number of valid subarrays ending at right to valid, which is right - left.
  7. Continue this process until right has reached the end of the array.
  8. Return the value of valid.
UML Thumbnail

Prefix Sum with Binary Search

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