随笔分类 - LeetCode
摘要：Given a string representing an expression of fraction addition and subtraction, you need to return the calculation result in string format. The final
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摘要：Design an in-memory file system to simulate the following functions: ls: Given a path in string format. If it is a file path, return a list that only
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摘要：You are given an integer array nums of length n where nums is a permutation of the numbers in the range [0, n - 1]. You should build a set s[k] = {num
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摘要：There is an m by n grid with a ball. Given the start coordinate (i,j) of the ball, you can move the ball to adjacent cell or cross the grid boundary i
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摘要：There's a tree, a squirrel, and several nuts. Positions are represented by the cells in a 2D grid. Your goal is to find the minimal distance for the s
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摘要：LeetCode wants to give one of its best employees the option to travel among N cities to collect algorithm problems. But all work and no play makes Jac
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摘要：Given an integer n, find the closest integer (not including itself), which is a palindrome. The 'closest' is defined as absolute difference minimized
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摘要：Given the coordinates of four points in 2D space, return whether the four points could construct a square. The coordinate (x,y) of a point is represen
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摘要：Given a 01 matrix M, find the longest line of consecutive one in the matrix. The line could be horizontal, vertical, diagonal or anti-diagonal. Exampl
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摘要：We define a harmonious array is an array where the difference between its maximum value and its minimum value is exactly 1. Now, given an integer arra
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摘要：Given a list of strings, you could concatenate these strings together into a loop, where for each string you could choose to reverse it or not. Among
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摘要：Given a list of positive integers, the adjacent integers will perform the float division. For example, [2,3,4] -> 2 / 3 / 4. However, you can add any
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摘要：Given an integer array nums, you need to find one continuous subarray that if you only sort this subarray in ascending order, then the whole array wil
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摘要：Given a positive integer n, return the number of all possible attendance records with length n, which will be regarded as rewardable. The answer may b
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摘要：Given a binary tree, you need to find the length of Longest Consecutive Path in Binary Tree. Especially, this path can be either increasing or decreas
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摘要：Given an array with n integers, you need to find if there are triplets (i, j, k) which satisfies following conditions: where we define that subarray (
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摘要：You are given several boxes with different colors represented by different positive numbers. You may experience several rounds to remove boxes until t
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摘要：Given an integer array with even length, where different numbers in this array represent different kinds of candies. Each number means one candy of th
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摘要：Given a binary tree, return the values of its boundary in anti-clockwise direction starting from root. Boundary includes left boundary, leaves, and ri
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摘要：Given two non-empty binary trees s and t, check whether tree t has exactly the same structure and node values with a subtree of s. A subtree of s is a
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