Welcome to
Leetcode from Hell.

Everyone knows Leetcode sucks, so we made something that sucks even more.

Leetcode from Hell (also known as the 10th circle of Hell) is a suite of coding problems and puzzles that test something far beyond your programming ability: your sanity.

Each problem contains a description and some sample test cases. Your job is simple: solve the question by implementing the given method.

But there's a catch. If, while writing your solution, you do not type anything for 5 seconds (10 on hard), all your code will be deleted and you will have to start over. 😱

Keep typing and stay alive—stop and you will die. 💀

Please select a problem below.

A note on JabbaScript

All problems are written in JavaScript, a language syntactically similar to Java. Here's some helpful tips to know about JavaScript before coding:

• There's no type declarations. Instead of int n = 0, use let n = 0. Use let for everything.
• To test equality, use === and !== instead of == and !=.
• The length of an array can be retrieved by arr.length.