DAG图的存储与DFS遍历

 1 #include <stdio.h>
 2 #include <string.h>
 3 
 4 const int maxv = 1000;
 5 const int maxe = 5000;
 6 const int maxn = 1000;
 7 /*
 8 * 邻接矩阵
 9 *
10 */
11 struct adjMetrix {
12     int G[maxn+10][maxn+10];
13     int visit[maxn]; //标记点访问与否
14     int n;
15     void addedge(int u, int v) {
16         G[u][v] = 1;
17         return ;
18     }
19     void read() {
20         memset(G, 0, sizeof(G));
21         memset(visit, 0, sizeof(visit));
22         int u, v, w;
23         scanf("%d", &n);
24         for (int i=0; i<n; i++) {
25             scanf("%d %d", &u, &v);
26             addedge(u, v);
27         }
28         return ;
29     }
30     void dfs(int i) {
31         for (int j=0; j<=n; j++) {
32             if (G[i][j]!=0 && visit[j]==0) {
33                 printf("%d %d\n", i, j);
34                 visit[j] = 1;
35                 dfs(j);
36             }
37         }
38     }
39 };
40 
41 /*
42 * 邻接链表
43 *
44 */
45 struct Edge {
46     int to, w, next;
47 };
48 
49 struct adjTable {
50     int node[maxv];
51     int visit[maxe];
52     int cnt;
53     struct Edge e[maxe];
54     void init() {
55         memset(node, -1, sizeof(node));
56         memset(visit, 0, sizeof(visit));
57         cnt = 0;
58     }
59     void addedge(int u,int v) {
60         e[cnt].to = v;
61         e[cnt].next = node[u];
62         node[u] = cnt++;
63     }
64     void read() {
65         int n, u, v, w;
66         scanf("%d", &n);
67         for (int i=1; i<=n; i++) {
68             scanf("%d %d", &u, &v);
69             addedge(u, v);
70         }
71         return ;
72     }
73     void dfs(int p) {
74         int i;
75         for (i=node[p]; i!=-1; i=e[i].next) {
76             if (visit[ e[i].to ] == 0) { //如果下一条边的指向点未被访问过
77                 printf("%d %d\n", p, e[i].to);
78                 visit[ p ] = 1; //标记当前点已被访问
79                 dfs( e[i].to );
80             }
81         }
82     }
83 };