11 2019 档案
摘要：题目如下： 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
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摘要：题目如下： Given many words, words[i] has weight i. Design a class WordFilter that supports one function, WordFilter.f(String prefix, String suffix). It wi
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摘要：题目如下： Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be
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摘要：题目如下： Given an array of strings products and a string searchWord. We want to design a system that suggests at most three product names from products a
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摘要：题目如下： You are given a map of a server center, represented as a m * n integer matrix grid, where 1 means that on that cell there is a server and 0 mean
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摘要：题目如下： On a plane there are n points with integer coordinates points[i] = [xi, yi]. Your task is to find the minimum time in seconds to visit all point
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摘要：题目如下： Given a 2D grid of size n * m and an integer k. You need to shift the grid k times. In one shift operation: Element at grid[i][j] becomes at gri
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摘要：题目如下： Given an array nums of integers, we need to find the maximum possible sum of elements of the array such that it is divisible by three. Example 1
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摘要：题目如下： Given a binary tree with the following rules: Now the binary tree is contaminated, which means all treeNode.val have been changed to -1. You nee
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摘要：题目如下： Given an array nums of integers, you can perform operations on the array. In each operation, you pick any nums[i] and delete it to earn nums[i]
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摘要：题目如下： A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a dee
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摘要：题目如下： 解题思路：动态规划。记dp[i] = v表示由i个人组成的圈子一共有v种握手的方法。对于一个由n个人组成的圈子，编号为0的人一共可以和编号为 (1，3，5....，n-1)的握手，这也很好理解，假设编号为0的人和编号为2的人握手，那么编号为1的人就被包在两人的连线的一侧，而同侧没有其他人
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摘要：题目如下： You are given some lists of regions where the first region of each list includes all other regions in that list. Naturally, if a region X contai
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摘要：题目如下： Given a list of pairs of equivalent words synonyms and a sentence text, Return all possible synonymous sentences sorted lexicographically. Examp
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摘要：题目如下： Design a Leaderboard class, which has 3 functions: Initially, the leaderboard is empty. Example 1: Constraints: 1 <= playerId, K <= 10000 It's g
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摘要：题目如下： Given an initial array arr, every day you produce a new array using the array of the previous day. On the i-th day, you do the following operati
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摘要：题目如下： Given an array nums of positive integers. Your task is to select some subset of nums, multiply each element by an integer and add all these numb
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摘要：题目如下： Given two integer arrays arr1 and arr2, return the minimum number of operations (possibly zero) needed to make arr1 strictly increasing. In one
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摘要：题目如下： Given a positive integer N, return the number of positive integers less than or equal to N that have at least 1 repeated digit. Example 1: Input
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摘要：题目如下： In the computer world, use restricted resource you have to generate maximum benefit is what we always want to pursue. For now, suppose you are a
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摘要：题目如下： Given a list of words, list of single letters (might be repeating) and score of every character. Return the maximum score of any valid set of wo
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摘要：题目如下： Given a 2D grid consists of 0s (land) and 1s (water). An island is a maximal 4-directionally connected group of 0s and a closed island is an isl
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摘要：题目如下： Given the following details of a matrix with n columns and 2 rows : The matrix is a binary matrix, which means each element in the matrix can be
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摘要：题目如下： Given n and m which are the dimensions of a matrix initialized by zeros and given an array indices where indices[i] = [ri, ci]. For each pair of
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摘要：题目如下： We are given an array A of N lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each stri
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摘要：题目如下： Given a string s of '(' , ')' and lowercase English characters. Your task is to remove the minimum number of parentheses ( '(' or ')', in any po
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摘要：题目如下： Given an array of integers nums and an integer k. A subarray is called nice if there are k odd numbers on it. Return the number of nice sub-arra
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摘要：题目如下： You are given two strings s1 and s2 of equal length consisting of letters "x" and "y" only. Your task is to make these two strings equal to each
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