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Re:设想...In Reply To:设想... Posted by:Assassin_ws at 2009-03-21 19:03:05 > 离散化+树状数组可以么? > 先把读入,然后离散化, > 在就是用树状数组依次求逆序数了. > 总时间复杂度貌似是O(nlogn+nlogn+nlogn) > 第一个nlogn是快排离散. > 第二个nlogn是树状数组求和 > 第三个nlogn是修改树状数组的值 > 一般情况下,树状数组的求和与修改与log相去甚远... 设想已经得到验证... 4297ms..... 准确的说,时间复杂度为O(4nlogn). 树状数组加离散...虽然效果不太明显,但毕竟是今天才学的离散,且此算法具有创意性... 所以... 掌声鼓励一下... Followed by:
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