## Problems
- [Superdoku](https://open.kattis.com/problems/superdoku) [^1]
- [Science!](https://open.kattis.com/problems/science) [^2]
- [Latin Square](https://open.kattis.com/problems/latinsquare)
- [Indicium](https://codingcompetitions.withgoogle.com/codejam/round/000000000019fd27/0000000000209aa0) [^3]

## See also
- [Hall's marriage theorem]()
- [Bipartite matching]()

## External links
- [Latin squares](http://www.math.caltech.edu/~2015-16/1term/ma006a/28.%20Latin%20Squares.pdf)

[^1]: <https://cs.baylor.edu/~hamerly/icpc/qualifier_2018/outlines-naq-2018.pdf>
[^2]: <https://web.archive.org/web/20200114203126/http://serjudging.vanb.org/wp-content/uploads/science.java>
[^3]: <https://codeforces.com/blog/entry/71545?#comment-598143>