Competitive Seagulls
time limit per test
1.0 s
memory limit per test
256 MB
input
standard input
output
standard output
There are two seagulls playing a very peculiar game. First they line up N unit squares in a line, all originally colored white.

两海鸥进行一种特殊游戏,排成N个白色单位方格。最长连续白色方格段长度为L,存在质数P满足条件P=L/2(向上取整)。玩家选择满足条件的P并涂黑连续的P个白格,无法行动者输。若双方最优策略,首动者是否能赢?
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