题目描述：
LeetCode 420. Strong Password Checker
A password is considered strong if below conditions are all met:
- It has at least 6 characters and at most 20 characters.
- It must contain at least one lowercase letter, at least one uppercase ...
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[LeetCode]Strong Password Checker
[LeetCode]Minimum Genetic Mutation
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LeetCode.
题目描述：
LeetCode 433. Minimum Genetic Mutation
A gene string can be represented by an 8-character long string, with choices from "A","C","G","T".
Suppose we need to investigate about a mutation (mutation from "start" to "end"), where ONE ...
[LeetCode]All O`one Data Structure
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LeetCode.
题目描述：
LeetCode 432. All O`one Data Structure
Implement a data structure supporting the following operations:
- Inc(Key) - Inserts a new key
with value 1. Or increments an existing key by 1. Key is guaranteed to be a non-empty string ...
LeetCode Weekly Contest 9解题报告
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LeetCode.
LeetCode Weekly Contest 9是LeetCode举办的第八场正式周赛，共4道题目，比赛时长2.5小时。
比赛链接：https://leetcode.com/contest/leetcode-weekly-contest-9/
题解列表：
LeetCode 422. Valid Word Square
LeetCode 423. Reconstruct Original Digits from English
[LeetCode]Word Squares
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LeetCode.
题目描述：
Given a set of words (without duplicates), find all word squares you can build from them.
A sequence of words forms a valid word square if the kth row and column read the exact ...