Duck Contest
Baby Ducks
A mother duck has 8 ducklings that she wants to arrange in a line: 4 yellow ducklings Wobble, Puddle, Splat and Nugget, 2 brown ducklings Biscuit and Gravy, and 2 grey ducklings Drizzle and Mist. According to the Duck Codex, each yellow duckling must be adjacent to at least one other yellow duckling, a brown duckling must be at the front of the line, and grey ducklings cannot be adjacent to each other. How many valid arrangements are there?
Submit
The contest ended at 8:16 p.m. AEST on Thursday 2nd July. All submissions will be unofficial .
Announcement
1:57:40 p.m.
Late submissions have been enabled. This means that you can attempt the problems without your score contributing to the leaderboard. Thanks for participating!
Announcement
6:04:03 p.m.
The test data for P2 "Duck Waves" has been fixed, and all submissions for this problem will be rejudged soon.
Announcement
3:29:06 p.m.
We've increased the time & memory limit of the problem p3 "Duck Pond Gaps".
Announcement
12:44:45 p.m.
The website had an issue when we were configuring it that caused us to have to push the start back by an hour. Sorry!!!!