實現

• 鄰接矩陣存圖
• DFS遞迴遍歷
• DFS非遞迴遍歷
• BFS遞迴遍歷

#include<cstdio>
#include<cstring>
#include<queue>
#include<stack>
#include<iostream>
#include<algorithm>
using namespace std;

typedef char VerTexType;
typedef int  ArcType;
const int MaxInt = 32767;
const
 
 int MVNum  = 100;

typedef struct{
        VerTexType vexs[MVNum];//頂點表
        ArcType arcs[MVNum][MVNum];//鄰接連結串列
        int vexnum, arcnum;//當前點數和邊數
}AMGraph;

AMGraph G;

int GreateUDN(AMGraph &G)
{
        cout<<"請輸入圖點的個數和邊的個數："<<endl;
        cin>>G.vexnum>>G.arcnum;
        memset
 
(G.arcs,0,sizeof(G.arcs));
        int v1,v2;
        for(int i=0;i<G.arcnum;++i)
        {
                cin>>v1>>v2;
                G.arcs[v1][v2]=G.arcs[v2][v1]=1;
        }
        return 1;
}

bool vis[MVNum];
void DFS_Recursion(AMGraph G,int v)//DFS遞迴寫法
{
        cout<<v<<
 
" ";
        vis[v]=1;
        for(int i=1;i<=G.vexnum;i++)
        {
                int x = G.arcs[v][i];
                if(x&&!vis[i])
                        DFS_Recursion(G,i);
        }
}
void DFS_NonRecursion(AMGraph G,int v)//DFS非遞迴
{
        memset(vis,0,sizeof(vis));
        stack<int> s;
        s.push(v);
        while(!s.empty())
        {
                int u=s.top();
                s.pop();
                if(!vis[u])
                {
                        cout<<u<<" ";
                        vis[u]=1;
                        for(int i=G.vexnum;i>0;--i)
                                if(G.arcs[u][i] && !vis[i])
                                        s.push(i);
                }
        }

}
void BFS_NonRecursion(AMGraph G,int v)//BFS非遞迴
{
        memset(vis,0,sizeof(vis));
        queue<int> que;
        que.push(v);
        vis[v]=1;
        cout<<v<<" ";
        while(que.size())
        {
                int  w = que.front();
                que.pop();
                for(int i=1;i<=G.vexnum;++i)
                {
                        int x = G.arcs[w][i];
                        if(x&&!vis[i])
                        {
                                cout<<i<<" ";
                                que.push(i);
                                vis[i]=1;
                        }
                }
        }

}
int main()
{
        printf("         ********************************************************\n"
               "         *                                                      *\n"
               "         *             此程式解決無向圖的遍歷問題               *\n"
               "         *             由鄰接矩陣儲存                           *\n"
               "         *             DFS BFS遍歷                              *\n"
               "         *                                                      *\n"
               "         ********************************************************\n"
               );

        GreateUDN(G);
//        for(int i=1;i<=G.vexnum;i++)
//        {
//                for(int j=1;j<=G.vexnum;j++)
//                        printf("%d ",G.arcs[i][j]);
//                puts("");
//        }
        memset(vis,0,sizeof(vis));
        cout<<"DFS_Recursion:";
        DFS_Recursion(G,1);
        puts("");
        cout<<"DFS_NonRecursion:";
        DFS_NonRecursion(G,1);
        puts("");
        cout<<"BFS_NonRecursion:";
        BFS_NonRecursion(G,1);
        return 0;
}

/*
        1
      /   \
     2     3
    / \   / \
   4   5 6   7

7 6
1 2
1 3
2 4
2 5
3 6
3 7
DFS_ans: 1 2 4 5 3 6 7
BFS_ans: 1 2 3 4 5 6 7
*/