自测-5 Shuffling Machine (20分)C++

本文介绍了一种基于数组映射的牌序洗牌算法,通过构造牌的初始化序列,并利用给定的数字序列进行多次洗牌操作,实现了牌序的随机重排。算法使用C++实现,详细展示了如何通过数组之间的映射关系完成洗牌过程。

就一个简单的映射。假设有两个数组,A(卡牌初始序),B他们的size相同,同时给定一组数C(仍然和AB的size相同),C数组中的下标表示假设为i,则代表A数组中下标为i所存的元素A[i],同时对应C数组下标所存的元素C[i],表示的是数组B的下标的位置BC[i]B_{C[i]}BC[i]。理解这个关系就好做了。

#include <iostream>
#include <vector>
using namespace std;

int main() {
	//构造牌的初始化序列
    vector<string> card(55, " ");//将第一个变为" ",从标为1的开始存
    for (int i = 1; i < 53; i++)
    {
        if (i < 14) {
            card[i] = ("S" + to_string(i));
        }
        if (i > 13 && i < 27) {
            card[i] = ("H" + to_string(i - 13));
        }
        if (i > 26 && i < 40) {
            card[i] = ("C" + to_string(i - 26));
        }
        if (i > 39) {
            card[i] = ("D" + to_string(i - 39));
        }
    }
    card[card.size() - 2] = ("J1");
    card[card.size() - 1] = ("J2");

    int repeat;
    vector<int> num;
    num.push_back(-1);
    cin >> repeat;
    cin.get();//吸收回车符
    int temp;
    int count = 0;
    while (cin >> temp)
    {
        num.push_back(temp);
        count++;
        if (count == 54)
        {
            break;
        }

    }

    //用另外一个数组临时存放
    vector<string> tempnum(55, " ");//从1开始存
    while (repeat > 0)
    {
        for (int i = 1; i < (int)num.size(); i++)
        {
            tempnum[num[i]] = card[i];
        }
        repeat--;
        card = tempnum;//忘记更新card了,浪费了好多时间
    }
    
    for (int j = 1; j < (int)tempnum.size(); j++)
    {
        cout << tempnum[j];
        if (j != (int)tempnum.size() - 1)
        {
            cout << " ";
        }
    }


    return 0;
}
A shuffling machine in C++ can be implemented using an array to represent the deck of cards and using the random number generator to shuffle the cards. Here is a sample code for a shuffling machine: ``` #include <iostream> #include <cstdlib> #include <ctime> using namespace std; const int NUM_CARDS = 52; class ShufflingMachine { private: int deck[NUM_CARDS]; int position; public: ShufflingMachine() { for (int i = 0; i < NUM_CARDS; i++) { deck[i] = i; } position = 0; } void shuffle() { srand(time(NULL)); for (int i = 0; i < NUM_CARDS; i++) { int j = rand() % NUM_CARDS; swap(deck[i], deck[j]); } position = 0; } int dealCard() { if (position >= NUM_CARDS) { shuffle(); } return deck[position++]; } }; int main() { ShufflingMachine shuffler; shuffler.shuffle(); for (int i = 0; i < NUM_CARDS; i++) { cout << shuffler.dealCard() << " "; } cout << endl; return 0; } ``` In this code, the `ShufflingMachine` class represents the shuffling machine. The `deck` array stores the deck of cards, and the `position` variable keeps track of the current position in the deck. The `shuffle` method shuffles the deck by randomly swapping cards. It uses the `srand` function to seed the random number generator with the current time, and the `rand` function to generate random indices for swapping cards. The `dealCard` method deals the next card from the deck. If the deck has been exhausted, it calls the `shuffle` method to shuffle the cards again. In the `main` function, we create a `ShufflingMachine` object and shuffle the cards. Then we deal all the cards and print them out.
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