算法入门经典（第七章）

#include <iostream>
#include <vector>
#include <cstdio>
using namespace std;
vector<int>map[10005];
int vis[1005];
int dfs(int s, int t, int n, int tmp[])
{
	if(s == t)
	{
		cout<<"1";
		for(int i = 1; i < n; i++)
		{
			cout<<" "<<tmp[i];
		}
		cout<<endl;
		return 0;
	}
	for(int i = 0; i < map[s].size(); i++)
	{
		if(vis[map[s][i]])	continue;
		vis[map[s][i]] = 1;
		tmp[n] = map[s][i];
			dfs(map[s][i], t, n+1, tmp);
		vis[map[s][i]] = 0;
	}
}
int main()
{
	freopen("in.txt","r",stdin);
	int tmp[1005];
    int x, y, n;
    while(cin>>n)
    {
    	vis[1] = 1;
    	while(cin>>x>>y && x && y)
    	{
    		map[x].push_back(y);
    		map[y].push_back(x);
    	}
    	dfs(1, n, 1, tmp);
    }
    return 0;
}