采用鄰接表表示圖的深度優先搜索遍歷

//采用鄰接表表示圖的深度優先搜索遍歷
#include <iostream>
using namespace std;

#define MVNum 100
typedef char VerTexType;

typedef char VerTexType;

typedef struct ArcNode {
	int adjvex;
	struct ArcNode* nextarc;
}ArcNode;

typedef struct VNode {
	VerTexType data;
	ArcNode* firstarc;
}VNode, AdjList[MVNum];

typedef struct {
	AdjList vertices;
	int vexnum, arcnum;
}ALGraph;

bool visited[MVNum];

int LocateVex(ALGraph G, VerTexType v) {
	for (int i = 0;i < G.vexnum;++i)
		if (G.vertices[i].data == v)
			return i;
	return -1;
}

void CreateUDG(ALGraph& G) {
	int i, k;
	cout << "請輸入總頂點數，總邊數，以空格隔開:";
	cin >> G.vexnum >> G.arcnum;
	cout << endl;

	cout << "輸入點的名稱，如a" << endl;

	for (i = 0;i < G.vexnum;++i) {
		cout << "請輸入第" << (i + 1) << "個點的名稱:";
		cin >> G.vertices[i].data;
		G.vertices[i].firstarc = NULL;
	}
	cout << endl;

	cout << "輸入邊依附的頂點，如a b" << endl;

	for (k = 0;k < G.arcnum;++k) {
		VerTexType v1, v2;
		int i, j;
		cout << "請輸入第" << (k + 1) << "條邊依附的頂點:";
		cin >> v1 >> v2;
		i = LocateVex(G, v1);
		j = LocateVex(G, v2);

		ArcNode* p1 = new ArcNode;
		p1->adjvex = j;
		p1->nextarc = G.vertices[j].firstarc;
		G.vertices[j].firstarc = p1;

		ArcNode* p2 = new ArcNode;
		p1->adjvex = j;
		p1->nextarc = G.vertices[j].firstarc;
		G.vertices[j].firstarc = p2;
	}
}

void DFS(ALGraph G, int v) {
	cout << G.vertices[v].data << "   ";
	visited[v] = true;
	ArcNode* p = G.vertices[v].firstarc;
	while (p != NULL) {
		int w = p->adjvex;
		if (!visited[w]) DFS(G, w);
		p = p->nextarc;
	}
}

int main() {
	cout << "采用鄰接表表示圖的深度優先搜索遍歷";
	ALGraph G;
	CreateUDG(G);
	cout << endl;
	cout << "無向連通圖G創建完成！" << endl;

	cout << "請輸入其實的點";
	VerTexType c;
	cin >> c;

	int i;
	for (i = 0;i < G.vexnum;++i) {
		if (c == G.vertices[i].data)
			break;
	}
	cout << endl;
	while (i >= G.vexnum) {
		cout << "該點不存在，請重新輸入！" << endl;
		cout << "請輸入遍歷連通圖的起始點：";
		cin >> c;
		for (i = 0;i < G.vexnum;++i) {
			if (c == G.vertices[i].data)
				break;
		}
	}
	cout << "深度優先搜索遍歷圖結果：" << endl;
	DFS(G, i);

	cout << endl;
	return 0;
}