LeetCode 2563 - Count the Number of Fair Pairs | Two Pointers | O(n log n)

In this video, we solve LeetCode 2563 - "Count the Number of Fair Pairs."

💡 Idea:
Sort the array, then use Two Pointers with a helper function.
Count pairs with sum less than = upper, minus pairs with sum less than= lower-1.

countPairs(upper) - countPairs(lower - 1)

O(n log n) solution!

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Видео LeetCode 2563 - Count the Number of Fair Pairs | Two Pointers | O(n log n) канала izumicode