Codeforces 551 D. GukiZ and Binary Operations
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http://codeforces.com/problemset/problem/551/D
可以一位一位的考虑,对于某一位,若k的值为0,那么a不能有相邻的1,你会发现情况数就是fibonacci,若k为1,就是总的情况数 - k = 0的情况数。最后,各位乘起来就行。
对了,fibonacci需要用到矩阵快速幂!
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