# Practice Questions:

[https://www.hackerrank.com/contests/acmicl2/challenges/lexicographically-smaller](https://www.hackerrank.com/contests/acmicl2/challenges/lexicographically-smaller)

[https://www.hackerrank.com/challenges/the-minion-game/problem?isFullScreen=true](https://www.hackerrank.com/challenges/the-minion-game/problem?isFullScreen=true)

[https://www.hackerrank.com/challenges/merge-the-tools/problem?isFullScreen=true](https://www.hackerrank.com/challenges/merge-the-tools/problem?isFullScreen=true)

[https://www.hackerrank.com/challenges/word-order/problem?isFullScreen=true](https://www.hackerrank.com/challenges/word-order/problem?isFullScreen=true)

[https://www.hackerrank.com/challenges/compress-the-string/problem?isFullScreen=true](https://www.hackerrank.com/challenges/compress-the-string/problem?isFullScreen=true)

[https://www.hackerrank.com/challenges/validating-credit-card-number/problem?isFullScreen=true](https://www.hackerrank.com/challenges/validating-credit-card-number/problem?isFullScreen=true)

[https://www.hackerrank.com/challenges/words-score/problem?isFullScreen=true](https://www.hackerrank.com/challenges/words-score/problem?isFullScreen=true)

# Topics to be familiar with:
* Lexicography
* Sequence and series