1042 Shuffling Machine (20 分)（模拟）

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

生词

英文	解释
procedure	手续，步骤
randomize	随机化
a deck of	一副
collaborate with	合作
gambler	赌徒
inadequate	不足的
casino	赌场
Spade	黑桃
Club	梅花
Diamond	方块

分析：

简单模拟。使用start和end数组保存每一次变换的开始顺序和结束顺序（以1~54的编号存储），最后根据编号与扑克牌字母数字的对应关系输出end数组

原文链接：https://blog.csdn.net/liuchuo/article/details/52108161

题解

注意用void函数直接对全局变量v进行shuffle是不可以的，因为这样每次操作都会将v的值改变，而应该用一个新的数组进行操作~

//错误示范
void shuffle(){
    for(int i=1;i<=54;i++){
        v[number[i]]=v[i];
    }
}

#include <bits/stdc++.h>

using namespace std;

vector<int> number(55);
vector<string> shuffle(vector<string> v){
    vector<string> new_v(55);
    for(int i=1;i<=54;i++){
        new_v[number[i]]=v[i];
    }
    return new_v;
}
int main()
{
#ifdef ONLINE_JUDGE
#else
    freopen("1.txt", "r", stdin);
#endif
    int n,num;
    vector<string> v(55);
    cin>>n;
    for(int i=1; i<=54; i++)
    {
        cin>>num;
        number[i]=num;
    }
    for(int i=1; i<=13; i++) v[i]="S"+to_string(i);
    for(int i=14; i<=26; i++) v[i]="H"+to_string(i-13);
    for(int i=27; i<=39; i++) v[i]="C"+to_string(i-26);
    for(int i=40; i<=52; i++) v[i]="D"+to_string(i-39);
    for(int i=53; i<=54; i++) v[i]="J"+to_string(i-52);
    for(int i=0; i<n; i++)
    {
        v=shuffle(v);
    }
    cout<<v[1];
    for(int i=2;i<=54;i++)
        cout<<" "<<v[i];
    return 0;
}

柳神题解

柳神的想法永远是那么精辟~

#include <cstdio>
using namespace std;
int main() {
    int cnt;
    scanf("%d", &cnt);
    int start[55], end[55], scan[55];
    for(int i = 1; i < 55; i++) {
        scanf("%d", &scan[i]);
        end[i] = i;
    }
    for(int i = 0; i < cnt; i++) {
        for(int j = 1; j < 55; j++)
            start[j] = end[j];
        for(int k = 1; k < 55; k++)
            end[scan[k]] = start[k];
    }
    char c[6] = {"SHCDJ"};
    for(int i = 1; i < 55; i++) {
        end[i] = end[i] - 1;
        printf("%c%d", c[end[i]/13], end[i]%13+1);
        if(i != 54) printf(" ");
    }
    return 0;
}