假设不带权有向图采用邻接矩阵G存储，设计实现以下功能的算法。
（1）求出图中每个顶点的出度。
（2）求出图中出度为0的顶点数。
（3）求出图中每个顶点的入度。

//参考博客：https://blog.csdn.net/qq_54162207/article/details/117414707

#include <iostream>
using namespace std;

#define Maxsize 100
#define VertexmMaxNum 20
#define ERROR  0
#define OK     1
typedef string VertexType;
typedef int  EdgeType;

typedef struct Graph   //无向图
{
	VertexType vex[VertexmMaxNum];
	EdgeType edge[VertexmMaxNum][VertexmMaxNum];
	int vexnum;     //顶点数
	int edgenum;  //边数
}Graph;

//确定某顶点在G中的位置下标
int locateVex(Graph& G, VertexType v)
{
	for (int i = 0; i < G.vexnum; i++)
	{
		if (v == G.vex[i]) return i;
	}
	return -1;
}

void CreateDG(Graph& G)
{
	int i = 0, j = 0;
	cout << "请输入有向图的顶点数和边数:";
	cin >> G.vexnum >> G.edgenum;
	cout << "请输入顶点:";
	for (i = 0; i < G.vexnum; i++)
	{
		cin >> G.vex[i];
	}
	for (i = 0; i < G.vexnum; i++)
	{
		for (j = 0; j < G.vexnum; j++)
			G.edge[i][j] = 0;
	}
	for (int k = 0; k < G.edgenum; k++)
	{
		cout << "请输入第" << k + 1 << "条边：";
		VertexType v1, v2;
		cin >> v1 >> v2;
		int i = locateVex(G, v1);
		int j = locateVex(G, v2);
		G.edge[i][j] = 1;
	}
}

/*--------打印图的邻接矩阵-----------*/
void PrintfUGraph(Graph G) {
	//将图的邻接矩阵输出在控制台上
	for (int i = 0; i < G.vexnum; i++) {
		cout << "v" << i + 1 << ":";
		for (int j = 0; j < G.vexnum; j++)
			cout << G.edge[i][j] << " ";
		cout << endl;
	}
}
//2.假设不带权有向图采用邻接矩阵G存储，设计实现以下功能的算法。
//（1）求出图中每个顶点的出度。
//（2）求出图中出度为0的顶点数。
//（3）求出图中每个顶点的入度。
//-------------------------核心代码-------------------------//
void count_chudu(Graph G)
{
	int count = 0;
	for (int i = 0; i < G.vexnum; i++)
	{
		count = 0;
		for (int j = 0; j < G.vexnum; j++)
		{
			if (G.edge[i][j] == 1)
				count++;
		}
		cout << G.vex[i] << "的出度的数量为:" << count << endl;
	}
}

void count_chudu_zero(Graph G)
{
	int zero_count = 0;
	int count = 0;
	for (int i = 0; i < G.vexnum; i++)
	{
		zero_count = 0;
		for (int j = 0; j < G.vexnum; j++)
		{
			if (G.edge[i][j] == 0)
				zero_count++;
		}
		if (zero_count == G.vexnum)
			count++;
	}
	cout <<"出度为0的顶点数:" << count << endl;
}

void count_rudu(Graph G)
{
	int count = 0;
	for (int i = 0; i < G.vexnum; i++)
	{
		count = 0;
		for (int j = 0; j < G.vexnum; j++)
		{
			if (G.edge[j][i] == 1)
				count++;
		}
		cout << G.vex[i] << "的入度的数量为:" << count << endl;
	}
}
//-------------------------核心代码-------------------------//
//顶点信息
//v1 v2 v3
//边信息
/*
v1 v2
v1 v3
v2 v3
*/
int main(void)
{
	Graph G;
	CreateDG(G);  //不带权有向图
	PrintfUGraph(G);
	cout << "--------------------求出图中每个顶点的出度--------------------" << endl;
	count_chudu(G);
	cout << "--------------------求出图中出度为0的顶点数--------------------" << endl;
	count_chudu_zero(G);
	cout << "--------------------求出图中每个顶点的入度--------------------" << endl;
	count_rudu(G);
	return 0;
}