dfs列印有向圖的起點到終點路徑

#include<bits/stdc++.h>
using namespace std;
struct Graph{
    int nodenum;
    vector<int>a[10];
}G;
 vector<int>a[100];
int path[100],cnt = 0;
int n;
int st,ed;
bool vis[100];
void dfs(int h){
    if(vis[h]) return ;
    path[++cnt] = h;
    vis[h] = 1;
    if(h == ed){
        printf("路徑為：");
        for(int i = 1; i <= cnt; i++) printf("%d ",path[i]);
        printf("\n");
        vis[h] = 0;
        cnt--;
        return ;
    }
    for(int i = 0; i<G.a[h].size(); i++){
        int to = G.a[h][i];
        dfs(to);
    }
    vis[h] = 0;
    cnt--;
    return ; 
}
int main(){
    scanf("%d%d",&st,&ed);
    scanf("%d",&n);
    int s ,t;
    for(int i = 1; i <= n; i++){
        scanf("%d%d",&s,&t);
        G.a[s].push_back(t);
    }
    dfs(st);
    return 0;
}