题目链接: Garden of Eden Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 210    Accepted Submission(s): 75 Problem Description When God made the first man, he put him on a beautiful garden, the G…

题目 Source http://acm.hdu.edu.cn/showproblem.php?pid=5977 Description When God made the first man, he put him on a beautiful garden, the Garden of Eden. Here Adam lived with all animals. God gave Adam eternal life. But Adam was lonely in the garden, s…

HDU - 5977 题意: 给定一颗树,问树上有多少节点对,节点对间包括了所有K种苹果. 思路: 点分治,对于每个节点记录从根节点到这个节点包含的所有情况,类似状压,因为K<=10.然后处理每个重根连着的点的值:直接枚举每个点,然后找出这个点对应的每个子集,累计和子集互补的个数. 枚举一个数的子集,例如1010,它的子集包括1010,1000,0010,0000.这里有个技巧: ) & x){ res += 1ll*cnt[((<<k)-) ^ s]; } //#pragma…

题意:给一棵节点数为n,节点种类为k的无根树,问其中有多少种不同的简单路径,可以满足路径上经过所有k种类型的点? 析:对于路径,就是两类,第一种情况,就是跨过根结点,第二种是不跨过根结点,分别讨论就好,由于结点比较大,所以采用分治来进行处理,优先选取重点作为划分的依据. 代码如下: #pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <string>…

题目大意:求有所有颜色的路径数. 题目分析:参考codeforces997C,先利用基的FMT的性质在$O(2^k)$做FMT,再利用只还原一位的特点在$O(2^k)$还原,不知道为什么网上都要点分治. 代码: #include<bits/stdc++.h> #define R register using namespace std; ; int n,k,a[maxn],fa[maxn],cnt[maxn],head[maxn]; struct edge{int to,nxt;}edges[…

都不好意思写题解了 跑了4000多ms 纪念下自己A的第二题 (我还有一道freetour II wa20多发没A...呜呜呜 #include<bits/stdc++.h> using namespace std; #define sz(X) ((int)X.size()) #define lson l,m,rt<<1 #define rson m+1,r,rt<<1|1 #define index Index typedef long long ll; const…

Problem Description When God made the first man, he put him on a beautiful garden, the Garden of Eden. Here Adam lived with all animals. God gave Adam eternal life. But Adam was lonely in the garden, so God made Eve. When Adam was asleep one night, G…

Garden of Eden Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others) Problem Description When God made the first man, he put him on a beautiful garden, the Garden of Eden. Here Adam lived with all animals. God gave Ad…

Cellular automata are mathematical idealizations of physical systems in which both space and time are discrete, and the physical quantities take on a nite set of discrete values. A cellular automaton consists of a lattice (or array), usually in nite,…

题目大概说给一棵有点权的树,输出字典序最小的点对,使这两点间路径上点权的乘积模1000003的结果为k. 树的点分治搞了.因为是点权过根的两条路径的LCA会被重复统计,而注意到1000003是质数,所以这个用乘法逆元搞一下就OK了.还有要注意“治”的各个实现,把时间复杂度“控制”在O(nlogn). WA了几次,WA在漏了点到子树根的路径,还有每次分治忘了清空数组. #include<cstdio> #include<cstring> #include<algorithm&g…