[Hackerrank Challenges - Climbing the leaderboard ] (https://www.hackerrank.com/challenges/climbing-the-leaderboard/problem)

CM: About 30% of the test cases for this challenge do not complete (server timeout) - the reason is that you need to use "generators" to move in the test group.

For a detailed overview of generators, follow this link. After reading it, your Python coding life will change for the better.