Given a 2D integer array nums, return all elements of nums in diagonal order as shown in the below images. Example 1:Input: nums = [[1,2,3],[4,5,6],[7,8,9]]Output: [1,4,2,7,5,3,8,6,9] Example 2:I

A sequence of numbers is called arithmetic if it consists of at least two elements, and the difference between every two consecutive elements is the same. More formally, a sequence s is arithmetic if

Given a 0-indexed integer array nums of size n and two integers lower and upper, return the number of fair pairs. A pair (i, j) is fair if:0 <= i < j < n, andlower <= nums[i] + n

Given a 0-indexed integer array nums of length n and an integer target, return the number of pairs (i, j) where 0 <= i < j < n and nums[i] + nums[j] < target. Example 1:Input: nums &#

HTML entity parser is the parser that takes HTML code as input and replace all the entities of the special characters by the characters itself. The special characters and their entities for HTML are:Q

A string s is called good if there are no two different characters in s that have the same frequency. Given a string s, return the minimum number of characters you need to delete to make s good. The f

You are given a 0-indexed integer array nums. The array nums is beautiful if:nums.length is even.nums[i] != nums[i + 1] for all i % 2 == 0.Note that an empty array is considered beautif

Given a 0-indexed string s, permute s to get a new string t such that:All consonants remain in their original places. More formally, if there is an index i with 0 <= i < s.length such that

There are n cities numbered from 0 to n-1. Given the array edges where edges[i] = [fromi, toi, weighti] represents a bidirectional and weighted edge between cities fromi and toi, and given the in

You are given four integers sx, sy, fx, fy, and a non-negative integer t. In an infinite 2D grid, you start at the cell (sx, sy). Each second, you must move to any of its adjacent cells. Return true i