Solution: Count the Number of Fair Pairs
Let's solve the Count the Number of Fair Pairs problem using the Two Pointers pattern.
We'll cover the following...
We'll cover the following...
Statement
Given an integer array nums and two integers lower and upper, count how many index pairs (i, j) satisfy all of the following:
the indices are distinct with i < j, and the sum nums[i] + nums[j] lies within the inclusive range from lower to upper.
Return the total number of such pairs.
Constraints:
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