随笔分类 - LeetCode
摘要：Given an integer array, find three numbers whose product is maximum and output the maximum product. Example 1: Input: [1,2,3] Output: 6 Example 2: Inp
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摘要：Given a positive integer a, find the smallest positive integer b whose multiplication of each digit equals to a. If there is no answer or the answer i
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摘要：Given m arrays, and each array is sorted in ascending order. Now you can pick up two integers from two different arrays (each array picks one) and cal
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摘要：Given the root of a binary tree, then value v and depth d, you need to add a row of nodes with value v at the given depth d. The root node is at depth
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摘要：Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are n
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摘要：Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we tak
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摘要：Given a string s and a list of strings dict, you need to add a closed pair of bold tag <b> and </b> to wrap the substrings in s that exist in dict. If
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摘要：Design and implement a data structure for a compressed string iterator. It should support the following operations: next and hasNext. The given compre
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摘要：Given a string representing a code snippet, you need to implement a tag validator to parse the code and return whether it is valid. A code snippet is
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摘要：Given a list of directory info including directory path, and all the files with contents in this directory, you need to find out all the groups of dup
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摘要：You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be rep
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摘要：Suppose you have a long flowerbed in which some of the plots are planted and some are not. However, flowers cannot be planted in adjacent plots - they
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摘要：Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite restaurants represented by strings. You need to h
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摘要：Given an m * n matrix M initialized with all 0's and several update operations. Operations are represented by a 2D array, and each operation is repres
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摘要：Given a positive integer n, find the number of non-negative integers less than or equal to n, whose binary representations do NOT contain consecutive
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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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