【HBU】数据结构月考7-1 列出所有祖先结点 (30 分)

7
2 -
- 6
- -
0 5
- -
4 1
- -
4

3 5

#include <cstdio>
#include <cstring>
#include <ctype.h>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <deque>
#include <vector>
#include <queue>
#include <string>
#include <map>
#include <stack>
#include <set>
#include <numeric>
#include <sstream>
#include <iomanip>
#include <limits>

#define CLR(a) memset(a, 0, sizeof(a))
#define pb push_back

using namespace std;
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
typedef pair<string, int> psi;
typedef pair<string, string> pss;

const double PI = 3.14159265358979323846264338327;
const double E = exp(1);
const double eps = 1e-30;

const int INF = 0x3f3f3f3f;
const int maxn = 1e2 + 5;
const int MOD = 1e9 + 7;

int v[10];

struct Node
{
    int l, r;
}q[10];

void init()
{
    CLR(q);
    CLR(v);
}
int target;
queue <int> Q;
vector <int> ans;

void bfs()
{
    int len = Q.size();
    for (int i = 0; i < len; i++)
    {
        int num = Q.front();
        Q.pop();
        cout <<num<<"*****"<<endl;
        if (q[num].l == target || q[num].r == target)
            ans.pb(num);
        if (q[num].l != -1)
            Q.push(q[num].l);
        if (q[num].r != -1)
            Q.push(q[num].r);
    }
    if (Q.size())
        bfs();
}

int main()
{
    init();
    int n;
    scanf("%d", &n);
    char a, b;
    for (int i = 0; i < n; i++)
    {
        scanf(" %c %c", &a, &b);
        if (a == '-')
            q[i].l = -1;
        else
        {
            q[i].l = a - '0';
            v[a - '0'] = 1;
        }
        if (b == '-')
            q[i].r = -1;
        else
        {
            q[i].r = b - '0';
            v[b - '0'] = 1;
        }
    }
    int root;
    for (int i = 0; i < n; i++)
    {
        if (v[i] == 0)
        {
            root = i;
            break;
        }
    }
    Q.push(root);
    //bfs();
    vector <int>::iterator it;
    int temp;
	scanf("%d", &target);
	for(int i=0;i<10;i++){
		for(int l=0;l<10;l++){
			if(q[l].l==target||q[l].r==target){
				ans.push_back(l);
				target=l;
			}
		}
	}
	
    for (int i=ans.size()-1;i>=0;i--)
    {
        if (i != ans.size()-1)
            printf(" ");
        printf("%d", ans[i]);
    }
    cout << endl;
}