[LeetCode] 1512. Number of Good Pairs
Given an array of integers nums. A pair (i,j) is called good if nums[i] == nums[j] and i < j. Return the number of good pairs. Example ...
原文：[LeetCode 1530] Number of Good Leaf Nodes Pairs
Given therootof a binary tree and an integerdistance. A pair of two differentleafnodes of a binary tree is said to be good if the length ofthe shortest pathbetween them is less than or equal todistanc ...
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