麻将回溯算法(无癞子)

  1 #include <stdio.h>
  2 #include <iostream>
  3 #include <sstream>
  4 #include <cstring>
  5 #include <vector>
  6
  7 using namespace std;
  8 typedef unsigned char byte;
  9 #define Arrlen(arr) sizeof(arr)/sizeof(arr[0])
 10
 11 byte arr[11] = {0x01,0x01,0x01,0x02,0x02,0x03,0x03,0x03,0x02,0x04,0x04};
 12 byte arrIndex[5] = {0};
 13 vector<byte> tempArr;
 14 vector<byte> allGroup;
 15
 16 byte SwitchToCardIndex(byte cbCardData)
 17 {
 18     return cbCardData - 1;
 19 }
 20
 21 byte SwitchToCardData(byte cbCardIndex)
 22 {
 23     return cbCardIndex + 1;
 24 }
 25
 26 void GetWeaveItem(byte dep)
 27 {
 28
 29     //每一种全部组合的区别最终在于将牌的不同，即以将牌的递归遍历为最终的根，可以保证结果的不重复
 30     //遍历每个Index，如果Index兑换成组合后，能否使dep=3，不能则+3还原，去兑换其他的组合
 31     //不区分组成组合的顺序，而是以所有的Index为组合的root节点，枚举所有的组合，并+3还原知道为true
 32     //为true时输出该手牌就OK,注意回溯时的出栈,即缓冲区的回溯
 33
 34     if (dep == 3 && tempArr.size() == Arrlen(arr))
 35     {
 36         cout << "可以和牌" <<endl;
 37
 38         for(auto itr = tempArr.begin();itr < tempArr.end();itr++)
 39         {
 40             if (itr == tempArr.begin())
 41             {
 42                 cout << (short)*itr;
 43             }
 44             else if (itr == tempArr.begin() + 1)
 45                 cout << (short)*itr << ",";
 46             else
 47                 cout << (short)*itr << " ";
 48             /*allGroup.push_back((short)*itr);*/
 49         }
 50
 51         cout << endl << endl;
 52     }
 53
 54     for (int i = 0; i < Arrlen(arrIndex); i++)
 55     {
 56         if (arrIndex[i] >= 3)
 57         {
 58             arrIndex[i] -= 3;
 59             tempArr.push_back(SwitchToCardData(i));
 60             tempArr.push_back(SwitchToCardData(i));
 61             tempArr.push_back(SwitchToCardData(i));
 62
 63             GetWeaveItem(dep+1);
 64
 65             arrIndex[i] += 3;
 66             tempArr.pop_back();
 67             tempArr.pop_back();
 68             tempArr.pop_back();
 69
 70         }
 71     }
 72
 73     //最后两张不再需要判断
 74     for (int i = 0; i < Arrlen(arrIndex) - 2; i++)
 75     {
 76         //arrIndex[4]未报错
 77         if ( i % Arrlen(arrIndex) < (Arrlen(arrIndex) - 2) && arrIndex[i] >= 1 && arrIndex[i + 1] >= 1 && arrIndex[i + 2] >= 1)
 78         {
 79             arrIndex[i] --; arrIndex[i + 1] --; arrIndex[i + 2] --;
 80             tempArr.push_back(SwitchToCardData(i));
 81             tempArr.push_back(SwitchToCardData(i+1));
 82             tempArr.push_back(SwitchToCardData(i+2));
 83
 84             GetWeaveItem(dep + 1);
 85
 86             arrIndex[i] ++; arrIndex[i + 1] ++; arrIndex[i + 2] ++;
 87             tempArr.pop_back();
 88             tempArr.pop_back();
 89             tempArr.pop_back();
 90
 91         }
 92     }
 93
 94 }
 95
 96 void main()
 97 {
 98     for (byte i=0;i < Arrlen(arr);i++)
 99     {
100         arrIndex[SwitchToCardIndex(arr[i])]++;
101     }
102
103     string str ="";
104     for (byte i = 0; i < Arrlen(arrIndex); i++)
105     {
106         stringstream stream;
107         stream<<(short)arrIndex[i];
108         str += " "+stream.str();
109     }
110
111     cout << str <<endl;
112
113     for (int i = 0; i < Arrlen(arrIndex); i++)
114     {
115         if (arrIndex[i] >= 2)//将牌
116         {
117             arrIndex[i] -= 2;
118             tempArr.push_back(SwitchToCardData(i));
119             tempArr.push_back(SwitchToCardData(i));
120
121             GetWeaveItem(0);
122
123             arrIndex[i] += 2;
124             tempArr.pop_back();
125             tempArr.pop_back();
126         }
127     }
128
129     system("pause");
130 }