标签：some nim define desire operation sed png cstring mit
| Time Limit: 1000MS | Memory Limit: 65536K | |
| Total Submissions: 12455 | Accepted: 5780 |
Description
A common pastime for poker players at a poker table is to shuffle stacks of chips. Shuffling chips is performed by starting with two stacks of poker chips, S1 and S2, each stack containing C chips. Each stack may contain chips of several different colors.
The actual shuffle operation is performed by interleaving a chip from S1 with a chip from S2 as shown below for C = 5:
The single resultant stack, S12, contains 2 * C chips. The bottommost chip of S12 is the bottommost chip from S2. On top of that chip, is the bottommost chip from S1. The interleaving process continues taking the 2nd chip from the bottom of S2 and placing that on S12, followed by the 2nd chip from the bottom of S1 and so on until the topmost chip from S1 is placed on top of S12.
After the shuffle operation, S12 is split into 2 new stacks by taking the bottommost C chips from S12 to form a new S1 and the topmost C chips from S12 to form a new S2. The shuffle operation may then be repeated to form a new S12.
For this problem, you will write a program to determine if a particular resultant stack S12 can be formed by shuffling two stacks some number of times.
Input
The first line of input contains a single integer N, (1 ≤ N ≤ 1000) which is the number of datasets that follow.
Each dataset consists of four lines of input. The first line of a dataset specifies an integer C, (1 ≤ C ≤ 100) which is the number of chips in each initial stack (S1 and S2). The second line of each dataset specifies the colors of each of the C chips in stack S1, starting with the bottommost chip. The third line of each dataset specifies the colors of each of the C chips in stack S2 starting with the bottommost chip. Colors are expressed as a single uppercase letter (A through H). There are no blanks or separators between the chip colors. The fourth line of each dataset contains 2 * C uppercase letters (A through H), representing the colors of the desired result of the shuffling of S1 and S2 zero or more times. The bottommost chip’s color is specified first.
Output
Output for each dataset consists of a single line that displays the dataset number (1 though N), a space, and an integer value which is the minimum number of shuffle operations required to get the desired resultant stack. If the desired result can not be reached using the input for the dataset, display the value negative 1 (?1) for the number of shuffle operations.
Sample Input
2 4 AHAH HAHA HHAAAAHH 3 CDE CDE EEDDCC
Sample Output
1 2 2 -1
题意：n组数据 两堆 扑克 长度都为C 给出两堆扑克按一定操作后的 目标扑克堆（两堆扑克的综合）
从下向上 按照一张 2堆扑克 一张 1堆扑克 顺堆放 。 计算得到目标 扑克需要多少次操作
如果不能得到目标扑克堆 操作数为 -1
思路： 由题意 模拟对扑克的操作 ， 最重要的是想到 扑克操作的终止条件 ，
终止条件： 如果对扑克的操作 出现循环 且没有得到目标堆 说明不可能得到 目标扑克堆 操作数为 -1
AC代码 ：
#include <cstdio> #include <cstring> #include <iostream> #include <algorithm> using namespace std ; #define maxn 150 char str_1[maxn] ; char str_2[maxn] ; char st[maxn * 2] ; // 正在模拟的扑克堆 char result[maxn * 2] ; // 目标扑克堆 char Ends[maxn*2] ; // 终止条件 int main(){ int n ; scanf("%d" , &n) ; int Case = 0 ; while(n--){ int c ; scanf("%d" , &c) ; scanf("%s %s %s" , str_1 , str_2 , result ) ; strcpy(st , str_1) ; strcat(st , str_2) ; strcpy(Ends , st) ; int times = 0 ; for(times = 0 ; strcmp(result , st ) !=0 ; times++){ // 模拟操作 for(int i=0 ; i < c ; i++){ str_1[i] = st[i] ; } for(int i=0 ; i<c ; i++){ str_2[i] = st[i+c] ; } for(int i=0 ; i<c ; i++){ st[2*i] = str_2[i] ; st[2*i+1] = str_1[i] ; } // 出现循环 且没有得到目标堆 if(strcmp(Ends , st) == 0 ){ times = -1 ; break ; } } printf("%d %d\n" , ++Case , times) ; } return 0; }
标签：some nim define desire operation sed png cstring mit
原文地址：http://www.cnblogs.com/yi-ye-zhi-qiu/p/7642889.html
