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 be useful to many in contests. First, we know that a node in...
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⌋ 最后合并左右两个子区间 下面请...
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 30D. Merge Sort 归并排序的逆操作,每次二分时把第二段第一位与第一段最后一位开始往前第一个比它大的数交换位置 可以用归并排序验证答案对不对 AI检测代码解析 #include<bits/stdc++.h>#definefi first#definese second#definemp make_pair#definepb push_back#definepii pair<int...
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...
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)...
847B - Preparing for Merge Sort 思路:前面的排序的最后一个一定大于后面的排序的最后一个。所以判断要不要开始新的排序只要拿当前值和上一个排序最后一个比较就可以了。 代码: #include<bits/stdc++.h>usingnamespacestd;#definell long long#definepb push_back#definemem(a,b) memset(a,b,sizeof(a))...
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1 change: 1 addition & 0 deletions 1 docs/basic/bubble-sort.md Original file line numberDiff line numberDiff line change @@ -26,6 +26,7 @@ $$ C++ 代码: ```cpp // 假设数组的大小是n+1,冒泡排序从数组下标1开始 void bubble_sort(int *a, int n) { bool flag = true; while (fla...