1042 Shuffling Machine (20 分)

该博客展示了如何用C++编写一个扑克牌洗牌程序。程序通过输入转换次数,利用next数组记录每张牌经过K次操作后的顺序,最终输出洗牌后的牌面。涉及到的主要概念包括数组操作、循环和扑克牌编号与花色的对应关系。

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#include<iostream>
using namespace std;
int main()
{
	char mp[5]={'S','H','C','D','J'};//牌的编号与花色的对应关系 
	int start[55],end[55],next[55];//next数组存放每个位置上的牌在操作后的位置
	int k;//输入转换次数 
	cin>>k; 
	for(int i=1;i<=54;i++)start[i]=i;//初始化牌的编号
	for(int i=1;i<=54;i++)cin>>next[i];//输入每个位置上的牌在操作后的位置
	for(int step=0;step<k;step++)//执行K次操作
	{
		for(int i=1;i<=54;i++)
		{
			end[next[i]]=start[i];
		}
		for(int i=1;i<=54;i++){
			start[i]=end[i];
		}
	 } 
	 for(int i=1;i<=54;i++)
	 {
	 	if(i!=1)cout<<" ";
	 	start[i]--;
	 	cout<<mp[start[i]/13]<<start[i]%13+1;
	 }
	 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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