北叶青藤

摘要： Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character. Example 1: Input: S = 阅读全文

摘要： Problem description: Design a class to find the kth largest element in a stream. Note that it is the kth largest element in the sorted order, not the 阅读全文

摘要： Given a list accounts, each element accounts[i] is a list of strings, where the first element accounts[i][0] is a name, and the rest of the elements a 阅读全文

摘要： In an infinite chess board with coordinates from -infinity to +infinity, you have a knight at square [0, 0].A knight has 8 possible moves it can make, 阅读全文

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 阅读全文

摘要： Given a binary array, find the maximum length of a contiguous subarray with equal number of 0 and 1. Example 1: Input: [0,1] Output: 2 Explanation: [0 阅读全文

摘要： Write a function that takes an unsigned integer and returns the number of '1' bits it has (also known as the Hamming weight). Note: Note that in some 阅读全文

摘要： In an N by N square grid, each cell is either empty (0) or blocked (1). A clear path from top-left to bottom-right has length k if and only if it is c 阅读全文

摘要： Given the root of a binary tree, find the maximum value V for which there exists different nodes A and B where V = |A.val - B.val| and A is an ancesto 阅读全文

摘要： In a given array nums of positive integers, find three non-overlapping subarrays with maximum sum. Each subarray will be of size k, and we want to max 阅读全文