Problems of the week

Easy problem:

Very easy problem to get familiar with the Leetcode platform.

https://leetcode.com/problems/reverse-string/

Intermediate problem:

Easiest than it seems, take the time to read it thoughtfully.

https://leetcode.com/problems/max-increase-to-keep-city-skyline/

Hard problem:

A common problem, you'll find some explanations and discussions in the Wikipedia link below (think about it before checking the link of course).

https://leetcode.com/problems/n-queens/

Clue: https://en.wikipedia.org/wiki/Eight_queens_puzzle