http://poj.org/problem?id=2513 Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks in a straight line such that the colors of the endpoints that touch are of t…

Colored Sticks DescriptionYou are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks in a straight line such that the colors of the endpoints that touch are of the same color?Inp…

Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks in a straight line such that the colors of the endpoints that touch are of the same color? Input Input is a…

题目链接:http://poj.org/problem?id=2513 题解:通过这题了解了字典树.用字典树存储颜色,并给颜色编上序号.这题为典型的欧拉回路问题:将每种颜色当成一个点.首先通过并查集判断是否为连通图,再检验是否符合欧拉回路的特点.不过题目有一点很奇怪,在并查集中,若图为连通,不是有且仅有一个点的fa[]等于它自己吗,即类似于根节点?为什么会出现有0个的情况,这一点搞不懂. 判断欧拉路是否存在的方法: 有向图:图连通,有一个顶点出度大入度1,有一个顶点入度大出度1,其余都是出度=入…

点击打开链接 Colored Sticks Time Limit: 5000MS   Memory Limit: 128000K Total Submissions: 27955   Accepted: 7403 Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks…

Time Limit: 5000MS   Memory Limit: 128000K Total Submissions: 27704   Accepted: 7336 Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks in a straight line suc…

题意:给定一些木棒,木棒两端都涂上颜色,求是否能将木棒首尾相接,连成一条直线,要求不同木棒相接的一边必须是相同颜色的.   无向图存在欧拉路的充要条件为: ①     图是连通的: ②     所有节点的度为偶数,或者有且只有两个度为奇数的节点. 图的连通可以利用并查集去判断. 度数的统计比较容易. 代码实现 //第一次用指针写trie,本来是用二维数组,发现数组开不下,只好删删改改,改成指针 //做这道题,知道了欧拉回路判定,还有用指针写trie #include <iostream> #i…

题目传送门 题目大意:给你一堆木棍,每根木管都有两种颜色,相同颜色的部分可以连接起来,问你这堆木棍可不可以连接成1根. 思路:大致的思路很好想,就是判断欧拉回路的方法(1.联通,2,要么顶点读书全为偶数,要么有两个奇数),统计每种颜色出现的次数就可以了.问题的关键是怎么统计,大家第一反应肯定是并查集统计联通路,用map统计次数,但这道题的数据量是25w*2,map会超时,然后想到了字典树. 我是用数组写的字典树,root表示的是某一种颜色的标号,(哈希的思想),这样空间开的会很大,理论上应该过不…

传送门:http://poj.org/problem?id=2513 题意:给你许多木棍,木棍两端都有颜色,问能不能首尾相接,要求颜色相同. 参考:https://www.cnblogs.com/kuangbin/archive/2012/08/07/2626223.html 思路: 由图论知识可以知道,无向图存在欧拉路的充要条件为: ①     图是连通的: ②     所有节点的度为偶数,或者有且只有两个度为奇数的节点. 图的连通可以利用并查集去判断. 度数的统计比较容易. 数据比较大,首先…

题目:http://poj.org/problem?id=2513 参考博客:http://blog.csdn.net/lyy289065406/article/details/6647445 http://www.cnblogs.com/LK1994/p/3263462.html #include <iostream> #include<cstdio> #include<cstring> #include<cstdlib> #include<stac…