loj#P3465. 「COCI 2021.2」Magenta
「COCI 2021.2」Magenta
Description
Paula and Marin are playing a game on a tree. Not on a real tree, of course. That would be dangerous. Although, who can say that a connected graph with n nodes, marked by integers from to , and edges, is completely safe?
Before the game started, Paula colored some edges blue, and Marin colored some edges red. If some edge was colored by both, its final color is magenta. All edges were colored by at least one of them.
Paula’s piece starts the game in node , and Marin’s piece in node . Players alternate moves, and Paula goes first. When it’s their turn, the player must move their piece to some adjacent node which doesn’t also contain the opponents piece. Also, Paula can’t use red edges, and Marin can’t use blue edges, while both can use magenta edges. The player who can’t make a move loses.
Paula and Marin both play optimally. If they realize that the game can run forever, they will declare a draw. Determine the outcome of the game!
Input
The first line contains an integer , the number of nodes.
The second line contains integers and , initial nodes of Paula and Marin.
The next lines describe the edges. Each line is of the form "", where and are the endpoints, and is plava
(Croatian for ), crvena
(Croatian for ) or magenta
.
Output
Output Paula
if Paula will win, Marin
if Marin will win, or Magenta
if it’s a draw.
3
1 3
3 2 magenta
2 1 magenta
Paula
5
3 5
1 2 magenta
1 3 magenta
2 4 plava
2 5 crvena
Marin
5
1 4
2 1 plava
1 3 crvena
5 2 plava
4 1 magenta
Magenta
Scoring
Subtask | Constraints | Points |
---|---|---|
All colors are magenta . |
||
No additional constraints. |