摘要： 题目如下： You are given the number of rows n_rows and number of columns n_cols of a 2D binary matrix where all values are initially 0. Write a function fl 阅读全文

摘要： 题目如下： In an array A containing only 0s and 1s, a K-bit flip consists of choosing a (contiguous) subarray of length K and simultaneously changing every 阅读全文

摘要： 题目如下： On a N x N grid of cells, each cell (x, y) with 0 <= x < N and 0 <= y < N has a lamp. Initially, some number of lamps are on. lamps[i] tells us 阅读全文

摘要： 题目如下： Given an array A of strings made only from lowercase letters, return a list of all characters that show up in all strings within the list (inclu 阅读全文

摘要： 题目如下： We are given that the string "abc" is valid. From any valid string V, we may split V into two pieces X and Y such that X + Y (X concatenated wit 阅读全文

摘要： 题目如下： Given an array A of 0s and 1s, we may change up to K values from 0 to 1. Return the length of the longest (contiguous) subarray that contains on 阅读全文

摘要： 题目如下： There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you ha 阅读全文

摘要： 题目如下： Given an array A of non-negative integers, the array is squareful if for every pair of adjacent elements, their sum is a perfect square. Return 阅读全文

摘要： 题目如下： We are stacking blocks to form a pyramid. Each block has a color which is a one letter string, like `'Z'`. For every block of color `C` we place 阅读全文

摘要： 题目如下： Given a binary tree, return the vertical order traversal of its nodes values. For each node at position (X, Y), its left and right children resp 阅读全文