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https://dmoj.ca/problem/seed2
Combinations: https://dmoj.ca/problem/coci15c2p2
https://dmoj.ca/problem/coci06c3p1
Better Way:
https://dmoj.ca/problem/hkccc15j3
https://dmoj.ca/problem/hkccc15j3
Todo:
https://dmoj.ca/problem/dmopc20c4p1
https://dmoj.ca/problem/ecoo15r2p3
https://dmoj.ca/problem/ccc05j5
https://dmoj.ca/problem/valentines18j5s2
https://dmoj.ca/problem/gfssoc3j5
https://dmoj.ca/problem/coci14c5p3
https://dmoj.ca/problem/ecoo12r1p4
https://dmoj.ca/problem/ccc13s3