### Unsolved Challenges - [ ] [Castle on the Grid](https://www.hackerrank.com/challenges/castle-on-the-grid/problem) + [Castle on the Grid](https://www.hackerrank.com/challenges/castle-on-the-grid/problem?h_l=interview&playlist_slugs%5B%5D%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D%5B%5D=stacks-queues)
