Given a Weather table, write a SQL query to find all dates’ Ids with higher temperature compared to its previous (yesterday’s) dates.

Given a sorted integer array without duplicates, return the summary of its ranges.

Given a string s, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can find by per...

Given an array of integers, find if the array contains any duplicates.

Given a 2D binary matrix filled with 0’s and 1’s, find the largest square containing only 1’s and return its area.

Given a 2D binary matrix filled with 0’s and 1’s, find the largest square containing only 1’s and return its area.

Given an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarray of which the sum ≥ s. If there isn’t one, retur...

Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. The valid op...

Given a binary tree, return all root-to-leaf paths.

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: