PAT 甲级 1042.Shuffling Machine C++/Java

题目来源

Shuffling is a procedure used to randomize a deck of playing cards. Because standard shuffling techniques are seen as weak, and in order to avoid "inside jobs" where employees collaborate with gamblers by performing inadequate shuffles, many casinos employ automatic shuffling machines. Your task is to simulate a shuffling machine.

The machine shuffles a deck of 54 cards according to a given random order and repeats for a given number of times. It is assumed that the initial status of a card deck is in the following order:

S1, S2, ..., S13, 
H1, H2, ..., H13, 
C1, C2, ..., C13, 
D1, D2, ..., D13, 
J1, J2

 

where "S" stands for "Spade", "H" for "Heart", "C" for "Club", "D" for "Diamond", and "J" for "Joker". A given order is a permutation of distinct integers in [1, 54]. If the number at the i-th position is j, it means to move the card from position i to position j. For example, suppose we only have 5 cards: S3, H5, C1, D13 and J2. Given a shuffling order {4, 2, 5, 3, 1}, the result will be: J2, H5, D13, S3, C1. If we are to repeat the shuffling again, the result will be: C1, H5, S3, J2, D13.

Input Specification:

Each input file contains one test case. For each case, the first line contains a positive integer K (K≤20) which is the number of repeat times. Then the next line contains the given order. All the numbers in a line are separated by a space.

Output Specification:

For each test case, print the shuffling results in one line. All the cards are separated by a space, and there must be no extra space at the end of the line.

Sample Input:

2
36 52 37 38 3 39 40 53 54 41 11 12 13 42 43 44 2 4 23 24 25 26 27 6 7 8 48 49 50 51 9 10 14 15 16 5 17 18 19 1 20 21 22 28 29 30 31 32 33 34 35 45 46 47

Sample Output:

S7 C11 C10 C12 S1 H7 H8 H9 D8 D9 S11 S12 S13 D10 D11 D12 S3 S4 S6 S10 H1 H2 C13 D2 D3 D4 H6 H3 D13 J1 J2 C1 C2 C3 C4 D1 S5 H5 H11 H12 C6 C7 C8 C9 S2 S8 S9 H10 D5 D6 D7 H4 H13 C5

题目大意：

第一行输入：给定一个正整数K(K <= 20)：洗牌的次数

第二行输入：洗牌的序列

 

有一副牌，从1 到 54 的顺序是 S1...S13，H1...H13，C1...C13，D1...D13，J1，J2

给定一个洗牌序列 arr

 

比如

洗牌顺序{4,2,5,3,1}
5张卡片: S3，H5，C1，D13，J2

S3  对应 4，S3   放在第 4 个位置
H5  对应 2，H5   放在第 2 个位置
C1  对应 5，C1   放在第 5 个位置
D13对应 3，C13 放在第 3 个位置
J2   对应 1，J2    放在第 1 个位置

得到新的卡片：J2 H5 D13 S3 C1

 

输出：洗牌K次后的序列，结尾不能有空格

 

分析：

我构造了一个字符串数组 orderCard[55] ，里面包含了54张牌

将输入的洗牌顺序保存到vector数组

假定洗牌n次，就循环n次

每一次循环，都用一个临时的字符串数组 temp[55] 保存洗牌后的顺序，然后更新 orderCard 

每次循环，执行 temp[arr[i]] = orderCard[i]; 

最后将  temp 复制到 orderCard 

 

C++实现：

#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main() {
    const int cardCount = 55;
    // orderCare[1-54] 代表着54张卡的编号
    string orderCard[cardCount] = { "0", "S1","S2","S3","S4","S5","S6","S7","S8","S9","S10","S11","S12","S13",
                        "H1","H2","H3","H4","H5","H6","H7","H8","H9","H10","H11","H12","H13",
                        "C1","C2","C3","C4","C5","C6","C7","C8","C9","C10","C11","C12","C13",
                        "D1","D2","D3","D4","D5","D6","D7","D8","D9","D10","D11","D12","D13",
                         "J1","J2" };
    int N;
    cin >> N;
    vector<int> arr(cardCount);
    for (int i = 1; i < cardCount; ++i) {
        cin >> arr[i];
    }

    for (int i = 0; i < N; ++i) {
        string temp[cardCount];
        for (int i = 1; i < cardCount; ++i) {
            temp[arr[i]] = orderCard[i];
        }
        
        for (int i = 0; i < cardCount; ++i) {
            orderCard[i] = temp[i];
        }
    }

    for (int i = 1; i < cardCount; ++i) {
        if (i != 1) {
            cout << ' ';
        }
        cout << orderCard[i];
    }
    return 0;
}

 

 

 

Java实现：