#include<cstdio> #include<cstring> #include<algorithm> #define ll long long using namespace std; struct node { ll x,h; } Tr[]; ],tr2[]; bool cmp(node s1,node s2) { return s1.x<s2.x; } bool cmp1(node s1,node s2) { return s1.h<s2.h;…

对于求逆序数问题,学会去利用树状数组进行转换求解方式,是很必要的. 一般来说我们求解逆序数,是在给定一串序列里,用循环的方式找到每一个数之前有多少个比它大的数,算法的时间复杂度为o(n2). 那么我们通过树状数组可以明显提高时间效率. 我们可以按照排列的顺序依次将数字放入树状数组中,并依次更新预与之相关联的树状数组元素.那么在将其更新完毕后,我们知道每个数对应的树状数组元素的左边的数肯定比它小,我们在以序列顺序依次更新树状数组时,如果有值在它前面出现,那么它对应的树状数组元素(在这个题目里存放的…

题目大意: Given a sequence A with length n,count how many quadruple (a,b,c,d) satisfies: a≠b≠c≠d,1≤a<b≤n,1≤c<d≤n,Aa<Ab,Ac>Ada≠b≠c≠d,1≤a<b≤n,1≤c<d≤n,Aa<Ab,Ac>Ad. A1,A2⋯AnA1,A2⋯An.  1≤n≤500001≤n≤50000  0≤Ai≤1e9 基本思路: 最朴素的思想就是算出所有顺序对所有逆序对…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4417 把数字离散化,一个查询拆成两个查询,每次查询一个前缀的和.主要问题是这个数组是静态的,如果带修改操作就不能离线了. //http://acm.hdu.edu.cn/showproblem.php?pid=4417 #include<bits/stdc++.h> using namespace std; ; int tree[maxn]; int N; int lowbit(int x) {…

思路:这题的思路很容易想到,把所有时间点离散化,然后按时间一步一步来,当到达时间i的时候处理所有在i处的查询. 这个代码怎一个挫字了得 #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<vector> #define Maxn 100010 #define lowbit(x) (x&(-x)) using namespace…

#include<iostream> #include<algorithm> #include<cstring> #include<cstdio> using namespace std; typedef long long ll; ; int a[N]; int ra[N]; int tr[N]; int n,x,y; int sz; int lowbit(int x) { return x&-x; } void add(int x,int c)…

Cao Cao made up a big army and was going to invade the whole South China. Yu Zhou was worried about it. He thought the only way to beat Cao Cao is to have a spy in Cao Cao's army. But all generals and soldiers of Cao Cao were loyal, it's impossible t…

Disharmony Trees HDU - 3015 One day Sophia finds a very big square. There are n trees in the square. They are all so tall. Sophia is very interesting in them. She finds that trees maybe disharmony and the Disharmony Value between two trees is associa…

Group Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1959    Accepted Submission(s): 1006 Problem Description There are n men ,every man has an ID(1..n).their ID is unique. Whose ID is i and i…

Rabbit Kingdom Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1999    Accepted Submission(s): 689 Problem Description Long long ago, there was an ancient rabbit kingdom in the forest. Every ra…