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恶心啊……先是写O(C^3logN)的矩乘，被卡时限了，后来注意到比较大的N可以缩小，只要奇偶性不变就行，但是100^3*log1000还是TLE……再后来才意识到当N=1000时朴素的DP是比矩乘快的…… 7次才AC啊…… Followed by:
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