01 2019 档案
摘要：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 infor
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摘要：In a string S of lowercase letters, these letters form consecutive groups of the same character. For example, a string like S = "abbxxxxzyy" has the g
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摘要：Given a set of N people (numbered 1, 2, ..., N), we would like to split everyone into two groups of any size. Each person may dislike some other peopl
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摘要：The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding one
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摘要：We have a list of bus routes. Each routes[i] is a bus route that the i-th bus repeats forever. For example if routes[0] = [1, 5, 7], this means that t
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摘要：In a given integer array A, we must move every element of A to either list B or list C. (B and C initially start empty.) Return true if and only if af
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摘要：We have jobs: difficulty[i] is the difficulty of the ith job, and profit[i] is the profit of the ith job. Now we have some workers. worker[i] is the a
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摘要：Some people will make friend requests. The list of their ages is given and ages[i] is the age of the ith person. Person A will NOT friend request pers
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摘要：A sentence S is given, composed of words separated by spaces. Each word consists of lowercase and uppercase letters only. We would like to convert the
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摘要：Given an array of unique integers, each integer is strictly greater than 1. We make a binary tree using these integers and each number may be used for
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