刷题记录-自测-5 Shuffling Machine (20 分)

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本文介绍了一种使用自动洗牌机模拟标准扑克牌洗牌过程的算法实现，通过给定的随机顺序多次重新排列54张牌的位置，确保了洗牌结果的随机性和公平性。

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 (≤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

#include <stdio.h>

void shuffle_card(int *card_index,int *card_trans,int *order);

int main()
{
    //设置一个结构体存储牌名
    struct cards
    {
        char name[4];
    }card[54]={"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"};
    //设置一个数组存储下标的顺序，以及另一个数组用于中间交换
    int i,n,order[54],card_index[54]={0,1,2,3,4,5,6,7,8,9,
                                      10,11,12,13,14,15,16,17,18,19,
                                      20,21,22,23,24,25,26,27,28,29,
                                      30,31,32,33,34,35,36,37,38,39,
                                      40,41,42,43,44,45,46,47,48,49,
                                      50,51,52,53};
    int card_trans[54]={0};
    scanf("%d",&n);
    for(i=0;i<54;i++)
        scanf("%d",&order[i]);
    //根据输入要求洗牌
    for(i=0;i<n;i++)
        shuffle_card(card_index,card_trans,order);
    //根据要求结尾去除空格
    for(i=0;i<53;i++)
        printf("%s ",&card[card_index[i]].name);
    printf("%s",&card[card_index[53]].name);

    return 0;
}
//洗牌函数，牌顺序的下标为card_index
void shuffle_card(int *card_index,int *card_trans,int *order)
{
    int i;
    for(i=0;i<54;i++)
    {
        card_trans[order[i]-1]=card_index[i];
    }
    for(i=0;i<54;i++)
    {
        card_index[i]=card_trans[i];
    }
}

注意

可以利用下标的交换代替实际交换对象。