## Problems
- [Intergalactic Mortgage](https://open.kattis.com/problems/mortgage)
- [Timing](https://open.kattis.com/problems/timing)
- [Train Addiction](https://open.kattis.com/problems/trainaddiction)
- [Xtreme Driving](https://open.kattis.com/problems/driving)
- [Extensive Or](https://open.kattis.com/problems/extensiveor)

## External links
- [Solving Linear Recurrence for Programming Contest](http://fusharblog.com/solving-linear-recurrence-for-programming-contest/)
- [Matrix](http://codeforces.com/blog/entry/21189)
- [Linear recurrences](https://community.topcoder.com/tc?module=Static&d1=features&d2=010408)