CF1946C Tree Cutting 题解

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【HDU 5909】 Tree Cutting （树形依赖型DP+点分治）

Tree Cutting Problem Description Byteasar has a tree T with n vertices conveniently labeled with 1,2,...,n. Each vertex of the tree has an integer value vi.The value of a non-empty tree T is equal to v1⊕v2⊕...⊕vn, where ⊕ denotes bitwise-xor.Now for…

BZOJ3391: [Usaco2004 Dec]Tree Cutting网络破坏

3391: [Usaco2004 Dec]Tree Cutting网络破坏 Time Limit: 1 Sec Memory Limit: 128 MBSubmit: 47 Solved: 37[Submit][Status] Description 约翰意识到贝茜建设网络花费了他巨额的经费,就把她解雇了．贝茜很愤怒,打算狠狠报复．她打算破坏刚建成的约翰的网络．约翰的网络是树形的,连接着N(1≤N≤10000)个牛棚．她打算切断某一个牛棚的电源,使和这个牛棚相连的所有电缆全…

3391: [Usaco2004 Dec]Tree Cutting网络破坏

3391: [Usaco2004 Dec]Tree Cutting网络破坏 Time Limit: 1 Sec Memory Limit: 128 MBSubmit: 76 Solved: 59[Submit][Status][Discuss] Description 约翰意识到贝茜建设网络花费了他巨额的经费,就把她解雇了．贝茜很愤怒,打算狠狠报复．她打算破坏刚建成的约翰的网络．约翰的网络是树形的,连接着N(1≤N≤10000)个牛棚．她打算切断某一个牛棚的电源,使和这个牛…

【HDU5909】Tree Cutting（FWT）

[HDU5909]Tree Cutting(FWT) 题面 vjudge 题目大意: 给你一棵\(n\)个节点的树,每个节点都有一个小于\(m\)的权值定义一棵子树的权值为所有节点的异或和,问权值为\(0..m-1\)的所有子树的个数题解考虑\(dp\) 设\(f[i][j]\)表示以\(i\)为根节点的子树中,异或和为\(j\)的子树的个数很显然,每次合并就是两个\(dp\)值做\(xor\)卷积那么直接用\(FWT\)优化就行了 #include<iostream> #inclu…

HDU 5909 Tree Cutting 动态规划快速沃尔什变换

Tree Cutting 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5909 Description Byteasar has a tree T with n vertices conveniently labeled with 1,2,...,n. Each vertex of the tree has an integer value vi. The value of a non-empty tree T is equal to v1⊕v…

BZOJ 3391: [Usaco2004 Dec]Tree Cutting网络破坏( dfs )

因为是棵树 , 所以直接 dfs 就好了... ------------------------------------------------------------------------------------- #include<cstdio> #include<cstring> #include<algorithm> #include<iostream> #define rep( i , n ) for( int i = 0 ; i <…

Tree Cutting

Tree Cutting Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 262144/131072 K (Java/Others) Problem Description Byteasar has a tree TTT with nnn vertices conveniently labeled with 1,2,...,n1,2,...,n1,2,...,n. Each vertex of the tree has an intege…