题目地址:http://poj.org/problem?id=1753 /* 这题几乎和POJ 2965一样,DFS函数都不用修改 只要修改一下change规则... 注意:是否初始已经ok了要先判断 */ #include <cstdio> #include <iostream> #include <algorithm> #include <cstring> #include <cmath> #include <string> #i…

Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 37427   Accepted: 16288 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the…

1.链接地址: http://bailian.openjudge.cn/practice/1753/ http://poj.org/problem?id=1753 2.题目: 总时间限制: 1000ms 内存限制: 65536kB 描述 Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is wh…

Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 45691   Accepted: 19590 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the…

看题传送门:http://poj.org/problem?id=1753 DFS枚举的应用. 基本上是参考大神的.... 学习学习.. #include<cstdio> #include<iostream> using namespace std; int n,s,d,ans; bool a[5][5],flag=false; //判断全部一样的情况 bool alllike() { for(int i=0;i<4;i++) for(int j=0;j<4;j++) i…

题目网址:http://poj.org/problem?id=1753 题目: Flip Game Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the other one is black and each piece is lying ei…

Flip Game Time Limit: 1000MS  Memory Limit: 65536K  Total Submissions: 4863  Accepted: 1983 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the oth…

点击打开链接 Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 25674   Accepted: 11093 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white a…

题目:http://poj.org/problem?id=1753 因为粗心错了好多次……,尤其是把1<<15当成了65535: 参考博客:http://www.cnblogs.com/kuangbin/archive/2011/07/30/2121677.html 主要思想: 1.如果用一个4*4的数组存储每一种状态,不但存储空间很大,而且在穷举状态时也不方便记录.因为每一颗棋子都只有两种状态,所以可以用二进制0和1表示每一个棋子的状态,则棋盘的状态就可以用一个16位的整数唯一标识.而翻转的…

Description Flip game squares. One side of each piece is white and the other one is black and each piece is lying either it's black or white side up. Each round you flip 3 to 5 pieces, thus changing the color of their upper side from black to white a…

题目:http://poj.org/problem?id=1753 这个题在開始接触的训练计划的时候做过,当时用的是DFS遍历,其机制就是把每一个棋子翻一遍.然后顺利的过了.所以也就没有深究. 省赛前一次做PC2遇到了差点儿一模一样的题,仅仅只是是把棋盘的界限由4X4改为了5X5,然后一直跑不出结果来,可是当时崔老湿那个队过了,在最后总结的时候.崔老湿就说和这个题一样,只是要枚举第一行进行优化. 我以为就是恢复第一行然后第二行以此类推,只是手推一下结果是6不是4,就知道这个有问题. 问了崔老湿,…

题目地址链接:http://poj.org/problem?id=1753 题目大意: 有4*4的正方形,每个格子要么是黑色,要么是白色,当把一个格子的颜色改变(黑->白或者白->黑)时,其周围上下左右(如果存在的话)的格子的颜色也被反转,问至少反转几个格子可以使4*4的正方形变为纯白或者纯黑? 解题思路: 因为只有16个格子,且只有黑白两种状态,想到用一个二进制整数来表示棋盘的状态.首先你需要明白这个题目的两个性质——任何一个格子翻偶数次等同于不翻:翻格子的顺序对最终的结果是没有影响的,也就…

https://vjudge.net/problem/POJ-1753 题意 4*4的棋盘,翻转其中的一个棋子,会带动邻接的棋子一起动.现要求把所有棋子都翻成同一种颜色,问最少需要几步. 分析 同一个棋子翻偶数次等于没有翻,翻奇数次就浪费步数,因此每个棋子最多翻一次,也就是说,答案最大就是16.故总状态数就是2^16,可以直接dfs暴力.还有另一种思路就是状态压缩,把棋盘压成16位的数字,翻转时采用异或操作,我们暴力枚举每个状态,即所有选择棋子的可能情况跑一遍,对于每一个棋子,对其能影响的位置可…

http://poj.org/problem?id=1753 题意:一个4*4的棋盘,只有黑和白两种棋子,每次翻转一个棋子,并且其四周的棋子也跟着翻转,求棋盘全为黑或全为白时所需的最少翻转次数. 思路:暴力枚举. 一共16个棋子,所以可以用二进制来存储.后来看了一下别人的代码,发现居然可以用异或运算来计算翻转情况,方便了不少. #include<iostream> #include<cstdio> #include<cstring> #include<queue&…

Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 26492   Accepted: 11422 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the…

Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the other one is black and each piece is lying either it's black or white side up. Each round you flip 3 to 5 p…

Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 28805   Accepted: 12461 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the…

题目链接: http://poj.org/problem?id=1753 题意: 由白块黑块组成的4*4方格,每次换一个块的颜色,其上下左右的块也会被换成相反的颜色.问最少换多少块,使得最终方格变为全白或者全黑~ 分析: 典型的枚举. 这种问题被称为开关问题,关键是要对周围的块翻动对自身的影响进行记录.后一排决定了前一排的最终状态,枚举第一排的情况即可. 代码: #include<iostream> #include<cstring> using namespace std; co…

Flip Game   Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 52279   Accepted: 22018 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and th…

Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 48663   Accepted: 20724 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the…

题目链接:http://poj.org/problem?id=1753 题意: 给你一个4*4的棋盘,上面有两种颜色的棋子(一种黑色,一种白色),你一次可以选择一个棋子翻转它(黑色变成白色,同理反之),选择的这枚棋子的上下左右都会被翻动(前提是上下左右都可以被翻动).问最少可以翻动多少颗棋子,让整个棋盘变成全部黑色或者全部白色. 题解: 4*4一共就16个格子,每个格子都可以是翻或者不翻,那么就是216翻法. 所以就可以用状态压缩的方法来解决. 比如说47. 47的二进制是00101111,我们…

Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 59468   Accepted: 24750 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the…

题意:4*4的棋盘摆满棋子,有黑有白,翻转一个棋子的同时也将翻转其上下左右的棋子(翻转后黑变白,白变黑),问使棋盘上所有棋子颜色相同,最少翻转的棋子数. 分析: 1.每个棋子至多翻转1次.翻转偶数次与不翻转结果相同,翻转奇数次与翻转1次结果相同. 2.每个棋子翻转或不翻转,共有216种情况. 3.IDA*搜索. #pragma comment(linker, "/STACK:102400000, 102400000") #include<cstdio> #include&l…

题目链接 题意:给定一个4*4的矩阵,有两种颜色,每次反转一个颜色会反转他自身以及上下左右的颜色,问把他们全变成一种颜色的最少步数. 题解:4*4的矩阵打表可知一共有四个自由变元,枚举变元求最小解即可. 代码: #include <iostream> #include <cstdio> #include <cmath> #include <cstring> #include <algorithm> #include <queue> #…

题目链接 题意:4*4的黑白棋,求把棋全变白或者全变黑的最小步数. 分析:以前用状态压缩做过. 和上题差不多,唯一的不同是这个终态是黑棋或者白棋, 但是只需要把给的初态做不同的两次处理就行了. 感觉现在还只是会套模板,不能独立的思考,好伤心.... #include <iostream> #include <cstdio> #include <cstring> #include <cstdlib> #include <cmath> #includ…

题目链接 4*4的格子, 初始为0或1, 每次翻转一个会使它四周的也翻转, 求翻转成全0或全1最少的步数. #include <iostream> #include <vector> #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #include <map> #include <set> #include &…

先列出题目: 1.POJ 1753 POJ 1753  Flip Game:http://poj.org/problem?id=1753 Sample Input bwwb bbwb bwwb bwww Sample Output 4 入手竟然没有思路,感觉有很多很多种情况需要考虑,也只能使用枚举方法才能解决了吧~ 4x4的数组来进行数据存储的话操作起来肯定非常不方便,这里借用位压缩的方法来存储状态,使用移位来标识每一个位置的的上下左右的位置操作. 详细看这里. 1.当棋盘状态id为0(全白)或…

链接:http://poj.org/problem?id=1753 Flip Game Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the other one is black and each piece is lying either i…

http://poj.org/problem?id=1222 http://poj.org/problem?id=1830 http://poj.org/problem?id=1681 http://poj.org/problem?id=1753 http://poj.org/problem?id=3185 这几个题目都类似,都可以使用高斯消元来求解一个模2的01方程组来解决. 有时候需要枚举自由变元,有的是判断存不存在解 POJ 1222 EXTENDED LIGHTS OUT 普通的问题.…

题目链接:http://poj.org/problem?id=1753 Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 46724   Accepted: 20002 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One…