题目描述：
LeetCode 846. Hand of Straights
Alice has a hand of cards, given as an array of integers.
Now she wants to rearrange the cards into groups so that each group is size W, and consists of W consecutive cards ...
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[LeetCode]Hand of Straights
[LeetCode]Backspace String Compare
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LeetCode.
题目描述：
LeetCode 844. Backspace String Compare
Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character.
Example 1:
Input: S = "ab#c", T = "ad#c" Output: true Explanation ...
[LeetCode]Unique Letter String
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题目描述：
LeetCode 828. Unique Letter String
A character is unique in string S if it occurs exactly once in it.
For example, in string S = "LETTER", the only unique characters are "L" and "R".
Let's define UNIQ(S) as the ...
[LeetCode]Consecutive Numbers Sum
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LeetCode.
题目描述：
LeetCode 829. Consecutive Numbers Sum
Given a positive integer N, how many ways can we write it as a sum of consecutive positive integers?
Example 1:
Input: 5 Output: 2 Explanation: 5 = 5 = 2 + 3
Example 2:
Input: 9 Output ...
[LeetCode]Masking Personal Information
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题目描述：
LeetCode 831. Masking Personal Information
We are given a personal information string S, which may represent either an email address or a phone number.
We would like to mask this personal information according to the following rules:
1. Email address:
We define a ...