AtCoder Regular Contest 148
D
mod M Game
AtCoder
⌀ 2009
原题
← CE →
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Problem Statement

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There are $2N$ integers $A_1, A_2, ..., A_{2N}$ written on a blackboard, and an integer $M$ at least $2$. Alice and Bob will play a game. They will alternately perform the following operation, with Alice going first, until there is no number on the blackboard.

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  • Choose a number and delete it from the blackboard.
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At the end of the game, if the sum of numbers deleted by Alice modulo $M$ equals the sum of numbers deleted by Bob modulo $M$, Bob wins; otherwise, Alice wins. Which player will win if both plays optimally?

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Constraints

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  • $1 \leq N \leq 2 \times 10^5$
  • $2 \leq M \leq 10^9$
  • $0 \leq A_i \leq M - 1$
  • All values in the input are integers.
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Input

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The input is given from Standard Input in the following format:

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N M
A_1 A_2 \dots A_{2N}

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Output

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If Alice wins, print Alice; if Bob wins, print Bob.

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样例

Input #1
2 9
1 4 8 5
Output #1
Alice
The game may proceed as follows. - Alice deletes $1$. - Bob deletes $4$. - Alice deletes $5$. - Bob deletes $8$. In this case, the sum of numbers deleted by Alice modulo $M$ is $(1 + 5) \bmod 9 = 6$, and the sum of numbers deleted by Bob modulo $M$ is $(4 + 8) \bmod 9 = 3$. Since $6 \neq 3$, Alice wins.
Input #2
3 998244353
1 2 3 1 2 3
Output #2
Bob
题目信息
题号
arc148_d
时间限制
2 s
内存限制
1024 MB

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