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Challenge Points: 10
Level: EasyGiven an array of integers nums, return the number of good pairs.
A pair (i, j) is called good if:
• nums[i] == nums[j], and
• i < j.
Input: nums = [1, 2, 3, 1, 1, 3]
Output: 4
Input: nums = [1, 1, 1, 1]
Output: 6
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