11 2020 档案
摘要：You are given a list of songs where the ith song has a duration of time[i] seconds. Return the number of pairs of songs for which their total duration
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摘要：Given a string s and an integer k, return the length of the longest substring of s such that the frequency of each character in this substring is grea
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摘要：Given an array of unique integers, arr, where each integer arr[i] is strictly greater than 1. We make a binary tree using these integers, and each num
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摘要：Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, '+', '-', '*', '/' ope
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摘要：Given the binary representation of an integer as a string s, return the number of steps to reduce it to 1 under the following rules: If the current nu
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摘要：Given a binary tree root and a linked list with head as the first node. Return True if all the elements in the linked list starting from the head corr
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摘要：Given two strings: s1 and s2 with the same size, check if some permutation of string s1 can break some permutation of string s2 or vice-versa. In othe
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摘要：Given the head of a singly linked list and an integer k, split the linked list into k consecutive linked list parts. The length of each part should be
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摘要：There is a special square room with mirrors on each of the four walls. Except for the southwest corner, there are receptors on each of the remaining c
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摘要：We are given a matrix with R rows and C columns has cells with integer coordinates (r, c), where 0 <= r < R and 0 <= c < C. Additionally, we are given
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摘要：Given an array nums of integers, return the length of the longest arithmetic subsequence in nums. Note that: A subsequence is an array that can be der
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摘要：Given an m x n binary matrix mat, return the number of special positions in mat. A position (i, j) is called special if mat[i][j] == 1 and all other e
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摘要：Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form
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摘要：Given an array of integers nums, half of the integers in nums are odd, and the other half are even. Sort the array so that whenever nums[i] is odd, i
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摘要：Given the coordinates of four points in 2D space p1, p2, p3 and p4, return true if the four points construct a square. The coordinate of a point pi is
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摘要：You are given an n x n binary matrix grid where 1 represents land and 0 represents water. An island is a 4-directionally connected group of 1's not co
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摘要：You are given an integer array cost where cost[i] is the cost of ith step on a staircase. Once you pay the cost, you can either climb one or two steps
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摘要：Given the root of a binary tree, find the maximum value v for which there exist different nodes a and b where v = |a.val - b.val| and a is an ancestor
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摘要：On an NxN chessboard, a knight starts at the r-th row and c-th column and attempts to make exactly K moves. The rows and columns are 0 indexed, so the
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摘要：A polynomial linked list is a special type of linked list where every node represents a term in a polynomial expression. Each node has three attribute
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摘要：Given an array of integers nums and an integer threshold, we will choose a positive integer divisor, divide all the array by it, and sum the division'
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摘要：Given an integer array arr. You have to sort the integers in the array in ascending order by the number of 1's in their binary representation and in c
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摘要：A tree is an undirected graph in which any two vertices are connected by exactly one path. In other words, any connected graph without simple cycles i
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摘要：Given a C++ program, remove comments from it. The program source is an array where source[i] is the i-th line of the source code. This represents the
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摘要：这三道题差别不是非常大所以可以放在一起练习。 243. Shortest Word Distance Given a list of words and two words word1 and word2, return the shortest distance between these two
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摘要：Given a set of points in the xy-plane, determine the minimum area of a rectangle formed from these points, with sides parallel to the x and y axes. If
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摘要：There are N children standing in a line. Each child is assigned a rating value. You are giving candies to these children subjected to the following re
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摘要：There are n soldiers standing in a line. Each soldier is assigned a unique rating value. You have to form a team of 3 soldiers amongst them under the
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摘要：Given an integer array nums, return the number of longest increasing subsequences. Example 1: Input: nums = [1,3,5,4,7] Output: 2 Explanation: The two
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