leetcode dark mode

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining. Input: height =… 

Given the root of a binary tree, determine if it is a valid binary search tree (BST). A valid BST is defined as follows: Input: root = [2,1,3] Output: true… 

Two integer arrays, nums and multipliers, of sizes n and m, respectively, are provided to you, where n >= m. The arrays are all one-dimensional.… 

Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j != k, and nums[i] + nums[j] + nums[k] ==… 

Given a string s, return the longest palindromic substring in s. A string is called a palindrome string if the reverse of that string is the same as the…