Leetcode Problem 992. Subarrays with K Different Integers

992. Subarrays with K Different Integers

Leetcode Solutions

Sliding Window Approach

  1. Define two helper functions that return the count of subarrays with at most k distinct integers.
  2. Each helper function uses a sliding window to keep track of the number of distinct integers.
  3. Initialize two pointers, left1 and left2, to the start of the array.
  4. Iterate through the array with a right pointer j.
  5. For each j, expand the window by including nums[j] and update the counter.
  6. If the count exceeds k, move left1 or left2 to reduce the window size.
  7. Calculate the number of subarrays with at most k and at most k-1 distinct integers.
  8. The difference between these two counts gives the number of good subarrays with exactly k distinct integers.
  9. Return the total count of good subarrays.
UML Thumbnail

Two Pointers with Frequency Map

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