随笔分类 - LeetCode
摘要：On an 2 x 3 board, there are five tiles labeled from 1 to 5, and an empty square represented by 0. A move consists of choosing 0 and a 4-directionally
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摘要：Given an expression such as expression = "e + 8 - a + 5" and an evaluation map such as {"e": 1} (given in terms of evalvars = ["e"] and evalints = [1]
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摘要：You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in Sis a type of stone
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摘要：Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or
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摘要：This question is the same as "Max Chunks to Make Sorted" except the integers of the given array are not necessarily distinct, the input array could be
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摘要：Given an array arr that is a permutation of [0, 1, ..., arr.length - 1], we split the array into some number of "chunks" (partitions), and individuall
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摘要：Given a string S, check if the letters can be rearranged so that two characters that are adjacent to each other are not the same. If possible, output
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摘要：Given an array of characters, compress it in-place. The length after compression must always be smaller than or equal to the original array. Every ele
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摘要：A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same element. Now given an M x N matrix, return True if and only if the m
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摘要：N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum number of swaps so that every couple is sitting side b
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摘要：Given strings S and T, find the minimum (contiguous) substring W of S, so that T is a subsequence of W. If there is no such window in S that covers al
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摘要：In a 2D grid from (0, 0) to (N-1, N-1), every cell contains a 1, except those cells in the given list mines which are 0. What is the largest axis-alig
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摘要：Given a chemical formula (given as a string), return the count of each atom. The atomic element always starts with an uppercase character, then zero o
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摘要：A string S of lowercase letters is given. We want to partition this string into as many parts as possible so that each letter appears in at most one p
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摘要：Given two integers L and R, find the count of numbers in the range [L, R] (inclusive) having a prime number of set bits in their binary representation
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摘要：Given an integer array, return the k-th smallest distance among all the pairs. The distance of a pair (A, B) is defined as the absolute difference bet
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摘要：Special binary strings are binary strings with the following two properties: The number of 0's is equal to the number of 1's. Every prefix of the bina
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摘要：A Range Module is a module that tracks ranges of numbers. Your task is to design and implement the following interfaces in an efficient manner. addRan
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摘要：Given two lists A and B, and B is an anagram of A. B is an anagram of A means B is made by randomizing the order of the elements in A. We want to find
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摘要：We are given a list schedule of employees, which represents the working time for each employee. Each employee has a list of non-overlapping Intervals,
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