题目描述：
LeetCode 447. Number of Boomerangs
Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i ...
[LeetCode]Number of Boomerangs
[LeetCode]Minimum Moves to Equal Array Elements
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LeetCode.
题目描述：
LeetCode 453. Minimum Moves to Equal Array Elements
Given a non-empty integer array of size n, find the minimum number of moves required to make all array elements equal, where a move is incrementing n - 1 elements by 1 ...
[LeetCode]Sort Characters By Frequency
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LeetCode.
题目描述：
LeetCode 451. Sort Characters By Frequency
Given a string, sort it in decreasing order based on the frequency of characters.
Example 1:
Input: "tree" Output: "eert" Explanation: 'e' appears twice while 'r' and 't' both appear once. So 'e' ...
[LeetCode]Serialize and Deserialize BST
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LeetCode.
题目描述：
LeetCode 449. Serialize and Deserialize BST
Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network ...
[LeetCode]Find All Numbers Disappeared in an Array
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LeetCode.
题目描述：
LeetCode 448. Find All Numbers Disappeared in an Array
Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once.
Find all the elements of [1 ...