https://open.kattis.com/contests/n5c3w9
https://open.kattis.com/contests/zoz2yj
https://open.kattis.com/contests/cti4i9
https://open.kattis.com/contests/z3iv2u
https://open.kattis.com/contests/ad9igk
https://open.kattis.com/contests/jvf33e
https://open.kattis.com/contests/h8jef9
https://open.kattis.com/contests/oaei9c
https://open.kattis.com/contests/pxuxzy
https://open.kattis.com/contests/gec7f7