# Posts tagged as **data-structure**

**data-structure**

## Wizard Meet-up - Find the cheapest way for Wizard level X to meet wizard level Y

April 28th, 2020 - 4 mins read

## Min Stack - Design a stack that supports push, pop, top, and retrieving the minimum element in constant time

April 26th, 2020 - 4 mins read

## Backspace String Compare - Given two strings S and T, return if they are equal

April 23rd, 2020 - 4 mins read

## Single Number - Given a non-empty array of integers, every element appears twice except for one. Find that single one

April 15th, 2020 - 4 mins read

## Happy Number - Write an algorithm to determine if a number n is happy

April 15th, 2020 - 4 mins read