hdu5977 Garden of Eden

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HDU5977 Garden of Eden（树的点分治）

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 Garden of Eden(树分治)

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…

HDU-5977 - Garden of Eden 点分治

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…

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…

HDU5977 Garden of Eden 【FMT】【树形DP】

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[…

uva10001 Garden of Eden

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,…

HDU 5977 Garden of Eden(点分治求点对路径颜色数为K)

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…