Tree Time Limit: 6000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2877    Accepted Submission(s): 883 Problem Description There are N (2<=N<=600) cities,each has a value of happiness,we consider two cities…

hdu 2689 超级大水题....两种代码都过了,开始以为n^2会tle,后来竟然过了...汗 注意下cin写在while里面,就可以了 #include <iostream> using namespace std; int main() { int n,i,j,a[1010]; while(cin>>n) { for(i=1; i<=n; i++) cin>>a[i]; int cnt = 0; for(i=1; i<=n; i++) for(j=i+…

hdu 5909 Tree Cutting 题意:一颗无根树,每个点有权值,连通子树的权值为异或和,求异或和为[0,m)的方案数 \(f[i][j]\)表示子树i中经过i的连通子树异或和为j的方案数 转移类似背包,可以用fwt加速 #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> using namespace std; typedef long lon…

HDU 5044 Tree field=problem&key=2014+ACM%2FICPC+Asia+Regional+Shanghai+Online&source=1&searchmode=source" target="_blank" style="">题目链接 就简单的树链剖分,只是坑要加输入外挂,还要手动扩栈 代码: #include <cstdio> #include <cstring>…

[HDU 5293]Tree chain problem(树形dp+树链剖分) 题面 在一棵树中,给出若干条链和链的权值,求选取不相交的链使得权值和最大. 分析 考虑树形dp,dp[x]表示以x为子树的最大权值和(选的链都在i的子树中) 设sum[x]表示x的儿子的dp值和,即\(\sum _{y \in \mathrm{son}(x)} dp[y]\) 1.不选两端点lca为x的链,dp[x]=sum[x] 2.选两端点lca为x的链,则dp[x]=max{链的权值+链上节点的所有子节点dp的…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2689 Sort it Problem Description You want to processe a sequence of n distinct integers by swapping two adjacent sequence elements until the sequence is sorted in ascending order. Then how many times it …

Tree Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 102400/102400 K (Java/Others) Total Submission(s): 1643    Accepted Submission(s): 461 Problem Description   Zero and One are good friends who always have fun with each other. This time, t…

Tree Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=4757 Description Zero and One are good friends who always have fun with each other. This time, they decide to do something on a tree which is a kind of graph…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2689 题目分析:求至少交换多少次可排好序,可转换为逆序对问题. 用冒泡排序较为简单,复杂度较大~~ 也可用归并排序,复杂度O(lognn), 统计个数后复杂都不变. /* Sort it Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2660…

Sort it Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4672    Accepted Submission(s): 3244 Problem Description You want to processe a sequence of n distinct integers by swapping two adjacent s…