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也可以用吧，从后往前算In Reply To:线段树是做数据用的吧？我想到一个用bst的，不过数据bt的话好像会退化到O(n^2) Posted by:frkstyc at 2005-05-10 12:28:30 线段树用来记录已经算出来的数的个数 Followed by: Post your reply here: |
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