思路

Accepted Code

#include <bits/stdc++.h>
using namespace std;

int n, u, v;
vector<int> mp[100005];
int f[100005];
inline int findf(int x) {
    
     return (f[x] == x ? x : f[x] = findf(f[x])); }
vector<pair<int, int>> q;
vector<int> ansq[100005];
int ans[100005];
int rk[100005];

void dfs(int x, int f) {
    
    
    for (int i = 0, sz = ansq[x].size(); i < sz; i++) {
    
    
        if (ansq[x][i] == f) continue;
        ans[ansq[x][i]] = ans[x] + 1;
        dfs(ansq[x][i], x);
    }
}

inline bool cmp(int a, int b) {
    
     return rk[a] < rk[b]; }

int main() {
    
    
    int t;
    scanf("%d", &t);
    while (t--) {
    
    
        scanf("%d", &n);
        q.clear();
        for (int i = 1; i <= n; i++) {
    
    
            mp[i].clear();
            ansq[i].clear();
            ans[i] = 1;
            f[i] = i;
        }
        for (int i = 0; i < n - 1; i++) {
    
    
            scanf("%d%d", &u, &v);
            mp[u].push_back(v);
            mp[v].push_back(u);
        }
        for (int i = 1; i <= n; i++) {
    
    
            scanf("%d", &v);
            q.push_back({
    
    v, i});
        }
        sort(q.begin(), q.end());
        for (int i = 0; i < n; i++) rk[q[i].second] = i + 1;
        for (int i = 0; i < n; i++) {
    
    
            u = q[i].second;
            sort(mp[u].begin(), mp[u].end(), cmp);
            for (int j = 0, sz = mp[u].size(); j < sz; j++) {
    
    
                v = mp[u][j];
                if (rk[v] > rk[u]) continue;
                int fv = findf(v);
                ansq[u].push_back(fv);
                f[fv] = u;
            }
        }
        ans[q[n - 1].second] = 1;
        dfs(q[n - 1].second, -1);
        for (int i = 1; i <= n; i++) printf("%d\n", ans[i]);
    }
    return 0;
}