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Re:怎么能快些？我写的求逆序数的函数是 n^2 的，总复杂度是 mn^2， 请教简单方法In Reply To:怎么能快些？我写的求逆序数的函数是 n^2 的，总复杂度是 mn^2， 请教简单方法 Posted by:sunmoonstar_love at 2005-08-07 16:03:10 O(n): 从后往前数,不同字母出现的次数分别记录在不同变量里. 遇到一个字母,逆序数的增量是比这个字母小的所有字母的次数和. Followed by: Post your reply here: |
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