C++实现麻将基本听牌胡牌的算法

#include <iostream>
#include <vector>
#include <algorithm>
#include <chrono>

enum MajiangType
{
	emMJType_Wan	= 1, //万
	emMJType_Tiao	= 2, //条
	emMJType_Tong	= 3, //筒
	emMJType_Zi	= 4, //字
	emMJType_Hua	= 5  //花
};

constexpr char MJ(char m, char n) {
	return m << 5 | n;
}

inline MajiangType Majiang_Type(char m) {
	return MajiangType(m >> 5);
}

inline char Majiang_Value(char m) {
	return m & 0x1F;
}

enum emMJ:char
{
	emMJ_1Wan = MJ(emMJType_Wan, 1),
	emMJ_2Wan = MJ(emMJType_Wan, 2),
	emMJ_3Wan = MJ(emMJType_Wan, 3),
	emMJ_4Wan = MJ(emMJType_Wan, 4),
	emMJ_5Wan = MJ(emMJType_Wan, 5),
	emMJ_6Wan = MJ(emMJType_Wan, 6),
	emMJ_7Wan = MJ(emMJType_Wan, 7),
	emMJ_8Wan = MJ(emMJType_Wan, 8),
	emMJ_9Wan = MJ(emMJType_Wan, 9),

	emMJ_1Tiao = MJ(emMJType_Tiao, 1),
	emMJ_2Tiao = MJ(emMJType_Tiao, 2),
	emMJ_3Tiao = MJ(emMJType_Tiao, 3),
	emMJ_4Tiao = MJ(emMJType_Tiao, 4),
	emMJ_5Tiao = MJ(emMJType_Tiao, 5),
	emMJ_6Tiao = MJ(emMJType_Tiao, 6),
	emMJ_7Tiao = MJ(emMJType_Tiao, 7),
	emMJ_8Tiao = MJ(emMJType_Tiao, 8),
	emMJ_9Tiao = MJ(emMJType_Tiao, 9),

	emMJ_1Tong = MJ(emMJType_Tong, 1),
	emMJ_2Tong = MJ(emMJType_Tong, 2),
	emMJ_3Tong = MJ(emMJType_Tong, 3),
	emMJ_4Tong = MJ(emMJType_Tong, 4),
	emMJ_5Tong = MJ(emMJType_Tong, 5),
	emMJ_6Tong = MJ(emMJType_Tong, 6),
	emMJ_7Tong = MJ(emMJType_Tong, 7),
	emMJ_8Tong = MJ(emMJType_Tong, 8),
	emMJ_9Tong = MJ(emMJType_Tong, 9),

	//字牌不能形成顺子，所以编码不能连续，而且有的地方有买码规则，字牌也根据除以4的余数被分配到了4个方位
	emMJ_DongFeng =		MJ(4, 1),//东 1 % 4 = 1
	emMJ_NanFeng =		MJ(4, 6),//南 6 % 4 = 2
	emMJ_XiFeng =		MJ(4, 11),//西 11 % 4 = 3
	emMJ_BeiFeng =		MJ(4, 16),//北 16 % 4 = 0
	emMJ_HongZhong =	MJ(4, 18),//中 18 % 4 = 2
	emMJ_FaCai =		MJ(4, 23),//发 23 % 4 = 3
	emMJ_BaiBan =		MJ(4, 28),//白 28 % 4 = 0

	//一副中花牌各只有一张
	emMJ_Mei =	MJ(5, 1),//梅
	emMJ_Lan =	MJ(5, 3),//兰
	emMJ_Ju =	MJ(5, 5),//菊
	emMJ_Zhu =	MJ(5, 7),//竹
	emMJ_Chun = MJ(5, 9),//春
	emMJ_Xia =	MJ(5, 11),//夏
	emMJ_Qiu =	MJ(5, 13),//秋
	emMJ_Dong = MJ(5,15)  //冬
};

const std::vector<char> all_majiang = {
	emMJ_1Wan,
	emMJ_2Wan,
	emMJ_3Wan,
	emMJ_4Wan,
	emMJ_5Wan,
	emMJ_6Wan,
	emMJ_7Wan,
	emMJ_8Wan,
	emMJ_9Wan,

	emMJ_1Tiao,
	emMJ_2Tiao,
	emMJ_3Tiao,
	emMJ_4Tiao,
	emMJ_5Tiao,
	emMJ_6Tiao,
	emMJ_7Tiao,
	emMJ_8Tiao,
	emMJ_9Tiao,

	emMJ_1Tong,
	emMJ_2Tong,
	emMJ_3Tong,
	emMJ_4Tong,
	emMJ_5Tong,
	emMJ_6Tong,
	emMJ_7Tong,
	emMJ_8Tong,
	emMJ_9Tong,

	emMJ_DongFeng,
	emMJ_NanFeng,
	emMJ_XiFeng,
	emMJ_BeiFeng,
	emMJ_BaiBan,
	emMJ_FaCai,
	emMJ_HongZhong
};
const std::vector<emMJ> pattern131 = { emMJ_1Wan,emMJ_9Wan,emMJ_1Tiao,emMJ_9Tiao,emMJ_1Tong,emMJ_9Tong,
		emMJ_DongFeng,emMJ_NanFeng,emMJ_XiFeng,emMJ_BeiFeng,emMJ_HongZhong,emMJ_FaCai,emMJ_BaiBan};

//基本和牌类型
bool IsCommonHu(const std::vector<char>& original_pai)
{
	//前提：牌已经排好序，不含已碰牌和已杠牌，所以牌数应该是3n+2
	//过程：先找出一对将牌，然后再寻找刻子牌和顺子牌，直到剩余牌为0才表示可和牌，否则不能和牌

	//记录将牌位置
	size_t jiang_location = -1;
	std::vector<char> pai;
	while (true)
	{
		auto i = jiang_location + 1;
		if (i >= original_pai.size())
		{
			return false;
		}

		pai = original_pai;
		if (jiang_location != -1)
		{
			if (pai[i] == pai[jiang_location])
			{
				++i;
			}
		}

		//寻找将牌位置，记录将牌第二个，并擦除该两牌
		jiang_location = -1;
		for (; i < pai.size() - 1; ++ i)
		{
			if (pai[i] == pai[i + 1])
			{
				jiang_location = i + 1;
				pai.erase(pai.begin() + i, pai.begin() + i + 2);
				break;
			}
		}
		if (jiang_location == -1)
		{
			//没有将牌，不能和牌
			return false;
		}

		//剩下的牌数是3的倍数
		//从左起第1张牌开始，它必须能组成刻子牌或者顺子牌才能和，否则不能和
		while (pai.size() >= 3)
		{
			if (pai[0] == pai[1] && pai[0] == pai[2])
			{
				//找到刻子牌并移除
				pai.erase(pai.begin(), pai.begin() + 3);
				continue;
			}

			auto it1 = std::find(pai.begin() + 1,pai.end(), pai[0] + 1);
            if (it1 == pai.end())
            {
                break;
            }

            auto it2 = std::find(it1 + 1, pai.end(), pai[0] + 2);
            if (it2 == pai.end())
            {
                break;
            }

            //找到顺子牌并移除
            pai.erase(it2);
            pai.erase(it1);
            pai.erase(pai.begin());
		}


		if (pai.empty())
		{
			break;
		}
	}
	
	return true;
}

//是否是十三幺牌型
bool Is131Hu(const std::vector<char>& pai)
{
	if (pai.size() != 14)
	{
		return false;
	}
	size_t k = 0;
	while (k < pai.size()-1)
	{
		if (pai[k] == pai[k+1])
		{
			break;
		}
		++k;
	}
	if (k == pai.size() - 1)
	{
		return false;
	}

	for (size_t i = 0,j = 0; i < pai.size() && j < pattern131.size(); ++ i, ++ j)
	{
	    if(i == k) ++ i;
		if (pai[i] != pattern131[j]) {
			return false;
		}
	}
	return true;
}

//是否是小七对牌型
bool Is7pairsHu(const std::vector<char>& pai) {
	const int pairs = 7;
	if (pai.size() != 2 * pairs)
	{
		return false;
	}
	int i = 0;
	for (; i < pairs; ++i)
	{
		if (pai[2 * i] != pai[2 * i + 1])
		{
			break;
		}
	}
	return i == pairs;
}

//检查听哪些牌
std::vector<char> Ting(const std::vector<char>& pai)
{
	//遍历所有牌，依次加入，判断是否能和牌
	std::vector<char> hupai;
	for (auto& i : all_majiang)
	{
		auto temp(pai);
		temp.push_back(i);

		std::sort(temp.begin(), temp.end());  //先排序
		if (Is131Hu(temp) || Is7pairsHu(temp) || IsCommonHu(temp))
		{
			hupai.push_back(i);
		}
	}
	return hupai;
}

int main()
{
	std::vector<char> v = { MJ(1,2),MJ(1,2),MJ(2,2),MJ(2,2),MJ(1,3),
		MJ(3,4),MJ(3,4),MJ(1,4),MJ(1,4),MJ(2,5),MJ(2,5),MJ(1,6),MJ(1,6) };

	std::vector<char> tingpai;
	auto start = std::chrono::steady_clock::now();
	tingpai = Ting(v);
	std::chrono::nanoseconds ns = std::chrono::steady_clock::now() - start;
	std::cout << "time:" << ns.count() << std::endl;
	for (auto& i : tingpai)
	{
		std::cout << "Result:" << (int)i << std::endl;
	}

	system("pause");
    	return 0;
}