HDU 5682/BestCoder Round #83 1003 zxa and leaf 二分+树

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HDU 5682/BestCoder Round #83 1003 zxa and leaf 二分+树

zxa and leaf Problem Description zxa have an unrooted tree with n nodes, including (n−1) undirected edges, whose nodes are numbered from 1 to n. The degree of each node is defined as the number of the edges connected to it, and each node whose degree…

从lca到树链剖分 bestcoder round#45 1003

bestcoder round#45 1003 题,给定两个点,要我们求这两个点的树上路径所经过的点的权值是否出现过奇数次.如果是一般人,那么就是用lca求树上路径,然后判断是否出现过奇数次(用异或),高手就不这么做了,直接树链剖分.为什么不能用lca,因为如果有树退化成链,那么每次询问的复杂度是O(n), 那么q次询问的时间复杂度是O(qn) 什么是树链剖分呢? 就是把树的边分成轻链和重链 http://blog.sina.com.cn/s/blog_6974c8b20100zc61.html…

hdu 5667 BestCoder Round #80 矩阵快速幂

Sequence Accepts: 59 Submissions: 650 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) Problem Description \ \ \ \ Holion August will eat every thing he has found. \ \ \ \ Now there are many foods,but he does…

hdu 5643 BestCoder Round #75

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King's Phone Accepts: 310 Submissions: 2980 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) 问题描述阅兵式上,国王见到了很多新奇东西,包括一台安卓手机.他很快对手机的图形解锁产生了兴趣. 解锁界面是一个 3 \times 33×3 的正方形点阵,第一行的三个点标号 1, 2, 31,2,3,第二行的三个点标号 4, 5, 64,5…

HDU 5682 zxa and leaf 二分树形dp

zxa and leaf 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5682 Description zxa have an unrooted tree with n nodes, including (n−1) undirected edges, whose nodes are numbered from 1 to n. The degree of each node is defined as the number of the edge…