Sometimes I encounter a type of range queries that I don't know how to do using segment tree, so I use a merge sort tree instead. It can answer queries in O(log2n)O(log2n). I decided to share this because it can
1) That's the whole point of a Segment tree / Merge sort tree. You don't want to go down the tree. Because at the bottom of the tree there arennodes. And you want to answer queries in less thanO(n)time. By using the conditionx <= l && r <= yyou are guaranteed that you on...
CodeForces 873D Merge Sort 构造 分治 题意 给出一个归并排序的算法mergesortmergesort,如果对于当前区间[l,r)[l,r)是有序的,则函数直接返回。 否则会分别调用mergesort(l,mid)mergesort(l,mid)和mergesort(mid,r)mergesort(mid,r),其中mid=⌊l+r2⌋mid=⌊l+r2⌋...
codeforces 873 D. Merge Sort(分治) 题目链接:http://codeforces.com/contest/873/problem/D 题解:这题挺简单的,除了一开始算作是调用到一次,然后每次执行操作时都会调用2次,所以最多调用几次就很好算了,而且只有奇数调用次数才合理。然后就是类似分治的思想,每次dfs二分过去,发现调用次数不够就交换mid和mid-1...
Educational Codeforces Round 30-D-Merge Sort(瞎搞) 题意:给你n和k,问你能否构造出一个长为n的全排列,使得按照归并排序的执行规则,正好调动k次归并排序函数使得原排列变成递增排列。 题解:我们知道对于递减的排列,需要调用归并函数最多次,因此我们可以初始化数组为递减全排列,然后调用归并函数即可,每次让k减2(...
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So, my question here is, if the problem will be solved using Merge Sort Tree or not after any kind of optimization. Or should I definitely use BIT. And if i do have to use BIT, then why? My code: https://ideone.com/wPb0AC (You can skip the code though)...
The problem is about counting the number of inversion in a particular range(from L to R). My approach: I used Mo's Algorithm here. And to calculate the add and remove function I used Merge Sort Tree. I was pretty sure it will pass the dataset of 5s. But somehow it gave TLE. Maybe...