题目链接:http://poj.org/problem?id=2438 本文链接:http://www.cnblogs.com/Ash-ly/p/5452615.html 题意: 有2*N个小朋友要坐在一张圆桌上吃饭,但是每两个小朋友之间存在一种关系,即敌人或者朋友,然后需要让你安排一个座位次序,使得相邻的两个小朋友都不会是敌人.假设每个人最多有N-1个敌人.如果没有输出"No solution!". 思路: 如果按照题意直接建图,每个点表示一个小朋友,小朋友之间的敌对关系表示两个点之…

http://poj.org/problem?id=2438 题意: 有2*N个人要坐在一张圆桌上吃饭,有的人之间存在敌对关系,安排一个座位次序,使得敌对的人不相邻. 假设每个人最多有N-1个敌人.如果没有输出"No solution!". 如果i和j可以相邻,之间连一条边 每个人最多有N-1个敌人,所以每个人至少会连出去N+1条边 根据狄拉克定理,图一定是哈密顿图 所以本题不存在无解的情况 然后输出一条哈密顿回路就好了 有关哈密顿图与哈密顿回路的问题 参见文章 http://www.…

题目链接 Description Usually children in kindergarten like to quarrel with each other. This situation annoys the child-care women. For instant, when diner time comes, a fierce conflict may break out when a certain couple of children sitting side by side…

Children's Dining Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 4730   Accepted: 754   Special Judge Description Usually children in kindergarten like to quarrel with each other. This situation annoys the child-care women. For instant,…

POJ 3083 -- Children of the Candy Corn(DFS+BFS) 题意: 给定一个迷宫,S是起点,E是终点,#是墙不可走,.可以走 1)先输出左转优先时,从S到E的步数 2)再输出右转优先时,从S到E的步数 3)最后输出S到E的最短步数 解题思路: 前两问DFS,转向只要控制一下旋转方向就可以 首先设置前进方向对应的数字 向上——N——0 向右——E——1 向下——S——2 向左——W——3 比如说右转优先,即为向右,向前,向左,向后,即逆时针方向for(int i…

分析: 2*n个小朋友,每个最多有n-1个"敌人",显然是存在哈密顿回路的. 预处理边,然后找哈密顿回路. code #include <iostream> #include <cstdio> #include <algorithm> #include <cstring> #include <vector> using namespace std; #define pb push_back #define sz(a) (int…

点击打开链接 Children of the Candy Corn Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8288   Accepted: 3635 Description The cornfield maze is a popular Halloween treat. Visitors are shown the entrance and must wander through the maze facing…

做了1天,总是各种错误,很无语 最后还是参考大神的方法 题目:http://poj.org/problem?id=3083 题意:从s到e找分别按照左侧优先和右侧优先的最短路径,和实际的最短路径 DFS找左右侧 的最短路径 #include <iostream> #include<cstdio> #include<cstring> #include<cstdlib> #include<stack> #include<queue> #i…

  Children of the Candy Corn Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8102   Accepted: 3540 Description The cornfield maze is a popular Halloween treat. Visitors are shown the entrance and must wander through the maze facing zombi…

http://poj.org/problem?id=3083 Description The cornfield maze is a popular Halloween treat. Visitors are shown the entrance and must wander through the maze facing zombies, chainsaw-wielding psychopaths, hippies, and other terrors on their quest to f…