- [ ] [Fraudulent Activity Notifications](https://www.hackerrank.com/challenges/fraudulent-activity-notifications/problem?h_l=interview&playlist_slugs%5B%5D%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D%5B%5D=sorting) - [ ] [Merge Sort: Counting Inversions](https://www.hackerrank.com/challenges/ctci-merge-sort/problem?h_l=interview&playlist_slugs%5B%5D%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D%5B%5D=sorting)
