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只知道求幂可以二分，这么连加怎么二分呢...In Reply To:我是求A+A^3+..+A^(k-(!(k&0x1)))不过TLE，就是求所有<=N的奇数步的方案的和，用的二分不过还是承受不了TLE了。。还是说我算法错了-_- Posted by:majia5 at 2008-10-19 19:06:07 Followed by:
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