短视频直播源码，有向网的拓扑排序实现的相关代码如下
/*
Author:Albert Tesla Wizard
Time:2020/10/28 23:07
*/
#include<bits/stdc++.h>
#define OK 1
#define Error 0
#define MAXSIZE 20
using namespace std;
typedef enum{DG,UDG,DN,UDN}Grpahkind;
typedef struct ArcNode
{
ArcNode* nextarc;
int* info;
int adjvertex;
};
typedef struct VNode
{
char data;
ArcNode* firstarc;
}VNode,AdjList[MAXSIZE];
typedef struct ALGraph
{
AdjList vertex;
int vertexnum,arcnum;
int kind;
}ALGraph;
int Locate(char v,ALGraph&G)
{
for(int i=1;i<=G.vertexnum;i++)
{
if(G.vertex[i].data==v)return i;
}
return -1;
}
int create(ALGraph&G)
{
char c1,c2;
int tail,head,w;
cout<<"请输入有向网的顶点数目:"<<endl;
cin>>G.vertexnum;
cout<<"请输入有向网的弧的数目:"<<endl;
cin>>G.arcnum;
cout<<"请输入有向网的顶点集合:"<<endl;
for(int i=1;i<=G.vertexnum;i++){cin>>G.vertex[i].data;G.vertex[i].firstarc=NULL;}
for(int i=1;i<=G.arcnum;i++)
{
cout<<"请输入组成有向网的弧的两个顶点c1,c2的值及该弧权值:"<<endl;
cin>>c1>>c2>>w;
tail=Locate(c1,G);
head=Locate(c2,G);
ArcNode* p=new ArcNode;
p->info=new int;
*(p->info)=w;
p->adjvertex=head;
p->nextarc=G.vertex[tail].firstarc;
G.vertex[tail].firstarc=p;
}
return OK;
}
void print(ALGraph&G)
{
cout<<"有向网的顶点数目为:"<<G.vertexnum<<endl;
cout<<"有向网的顶点集合为:";
for(int i=1;i<=G.vertexnum;i++)cout<<G.vertex[i].data<<" ";
cout<<endl;
cout<<"有向网的弧的数目为:"<<G.arcnum<<endl;
cout<<"有向网弧的集合为:";
for(int i=1;i<=G.vertexnum;i++)
{
ArcNode* p=G.vertex[i].firstarc;
while(p)
{
cout<<"<"<<G.vertex[i].data<<","<<G.vertex[p->adjvertex].data<<","<<*(p->info)<<">";
p=p->nextarc;
}
}
cout<<endl;
}
void FindInDegree(int indegree[],ALGraph G)
{
ArcNode* p;
for(int i=1;i<=G.vertexnum;i++)indegree[i]=0;
for(int i=1;i<=G.vertexnum;i++)
{
p=new ArcNode;
p=G.vertex[i].firstarc;
while(p)
{
indegree[p->adjvertex]++;
p=p->nextarc;
}
}
}
int TopologicalSort(ALGraph G)
{
int cnt=0,indegree[MAXSIZE];//输出的顶点数
stack<int>S;
ArcNode* p;
FindInDegree(indegree,G);
for(int i=1;i<=G.vertexnum;i++)if(!indegree[i])S.push(i);
while(!S.empty())
{
int j=S.top();
S.pop();
cout<<G.vertex[j].data<<" ";
cnt++;
for(p=G.vertex[j].firstarc;p;p=p->nextarc)
{
int k=p->adjvertex;
if(!(--indegree[k]))S.push(k);
}
}
if(cnt<G.vertexnum){cout<<"该有向网有回路"<<endl;return Error;}
else {cout<<"为一个拓扑序列"<<endl;return OK;}
}
int main()
{
system("color 5E");
ALGraph G;
create(G);
print(G);
TopologicalSort(G);
return 0;
}
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