C++实现有向图邻接表的构建

本文实例为大家分享了C++实现有向图邻接表的构建代码，供大家参考，具体内容如下

数据结构里面的一道基础题，分享下自己的写法，验证可跑。

#include<iostream>
#include<string>
const int MAX = 20;
using namespace std;

struct ArcNode {      //弧结点
int adjvex = -1;     //所指顶点位置
ArcNode *nextarc = nullptr; //下一条狐指针
size_t info = 0;  //弧信息
};

struct VNode {      //顶点
string data = "0";
ArcNode *firstarc = nullptr; //第一条依附该顶点的弧的指针
};

struct Graph {      //图结构
VNode vertices[MAX];         //全部顶点
int vexnum, arcnum;     //顶点数和弧数
Graph(int m, int n) :vexnum(m), arcnum(n) {};
Graph() :vexnum(0), arcnum(0) {};
};

int main()
{
int vnum, anum, tempanum = 0;
cout << "输入顶点数：";
cin >> vnum;
cout << "输入弧数：";
cin >> anum;
cout << "\n\n";
Graph G(vnum, anum);
for (int i = 0; i != vnum; ++i) {
cout << "输入结点" << i << "的信息：";
cin >> G.vertices[i].data;
if (tempanum != anum)
cout << "输入依靠此结点的弧的信息（输入-1以停止）：\n";
else
cout << "已输入所有弧的信息！\n";
bool first = true;
ArcNode *p, *temp;
for (int j = 0; (j != anum) && (tempanum != vnum); ++j) {
int pointto;
cout << "输入弧" << tempanum << "所指向的顶点位置：";
cin >> pointto;
if (pointto == -1) break;
else {
++tempanum;
if (first == true) {
first = false;
G.vertices[i].firstarc = new ArcNode;
G.vertices[i].firstarc->adjvex = pointto;
p = G.vertices[i].firstarc;
}
else {
temp = new ArcNode;
temp->adjvex = pointto;
p->nextarc = temp;
p = temp;
}
}
}
cout << endl;
}

for (int i = 0; i != anum; ++i) {
cout << "顶点" << i << ": |" << G.vertices[i].data << "|";
if (G.vertices[i].firstarc) {
cout << " -> " << G.vertices[i].firstarc->adjvex;
auto pt = G.vertices[i].firstarc->nextarc;
while (pt) {
cout << " -> " << pt->adjvex;
pt = pt->nextarc;
}
cout << "-> ^";
}
else
cout << " -> ^";
cout << endl;
}
return 0;
}

由于只是单纯构建基本的无权值有向图邻接表，里面的弧结构中弧信息未利用到。

以上就是本文的全部内容，希望对大家的学习有所帮助

您可能感兴趣的文章:

• C++实现有向图的邻接表表示