func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 4e5 + 5;   int n, q, l[N], r[N], level[N], p[N][20];   pair<int, int> res[N];   int import[N], numCity, numVirus, node[N], total_num;   vector<int> adj[N], newAdj[N];   struct T {     int city, speed;   };   T virus[N];   int cnt = 0;   void dfs(int x, int pa) {     cnt++;     l[x] = cnt;     p[x][0] = pa;     for (auto &u : adj[x]) {       if (u == pa) continue;       level[u] = level[x] + 1;       dfs(u, x);     }     r[x] = cnt;   }   void init_lca() {     for (int k = 1; k <= 18; k++) {       for (int i = 1; i <= n; i++) p[i][k] = p[p[i][k - 1]][k - 1];     }   }   int lca(int x, int y) {     if (x == 1 || y == 1) return 1;     if (level[x] > level[y]) swap(x, y);     int diff = level[y] - level[x];     for (int k = 18; k >= 0; k--)       if (diff >> k & 1) y = p[y][k];     if (x == y) return x;     for (int k = 18; k >= 0; k--) {       if (p[x][k] != p[y][k]) {         x = p[x][k];         y = p[y][k];       }     }     return p[x][0];   }   bool isParent(int p, int u) { return (l[p] <= l[u] && l[u] <= r[p]); }   bool lf(const int &x, const int &y) { return l[x] < l[y]; }   int dist(int x, int y) { return level[x] + level[y] - 2 * level[lca(x, y)]; }   void compress_tree() {     total_num = numCity + numVirus;     for (int i = 1; i <= numVirus; i++) node[i] = virus[i].city;     for (int i = numVirus + 1; i <= total_num; i++)       node[i] = import[i - numVirus];     sort(node + 1, node + total_num + 1, lf);     total_num = unique(node + 1, node + total_num + 1) - node - 1;     int now = total_num;     for (int i = 1; i < now; i++) {       total_num++;       node[total_num] = lca(node[i], node[i + 1]);     }     sort(node + 1, node + total_num + 1, lf);     total_num = unique(node + 1, node + total_num + 1) - node - 1;     for (int i = 1; i <= total_num; i++) newAdj[node[i]].clear();     stack<int> st;     st.push(node[1]);     for (int i = 2; i <= total_num; i++) {       while (!st.empty() && !isParent(st.top(), node[i])) st.pop();       if (!st.empty()) {         int par = st.top();         newAdj[par].push_back(node[i]);         newAdj[node[i]].push_back(par);       }       st.push(node[i]);     }   }   int calc(int dist, int s) { return (dist - 1 + s) / s; }   void solve() {     for (int i = 1; i <= total_num; i++) res[node[i]] = make_pair(1e9, 0);     priority_queue<pair<pair<int, int>, int>, vector<pair<pair<int, int>, int>>,                    greater<pair<pair<int, int>, int>>>         pq;     for (int i = 1; i <= numVirus; i++) {       int id = virus[i].city;       res[id] = make_pair(0, i);       pq.push(make_pair(res[id], id));     }     while (!pq.empty()) {       auto now = pq.top();       pq.pop();       if (res[now.second] != now.first) continue;       for (auto &u : newAdj[now.second]) {         if (res[u] > make_pair(calc(dist(u, virus[now.first.second].city),                                     virus[now.first.second].speed),                                now.first.second)) {           res[u] = make_pair(calc(dist(u, virus[now.first.second].city),                                   virus[now.first.second].speed),                              now.first.second);           pq.push(make_pair(res[u], u));         }       }     }     for (int i = 1; i <= numCity; i++) cout << res[import[i]].second <<    ;     cout <<   n ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(nullptr);     cin >> n;     for (int i = 1; i < n; i++) {       int u, v;       cin >> u >> v;       adj[u].push_back(v);       adj[v].push_back(u);     }     dfs(1, 0);     init_lca();     cin >> q;     while (q--) {       cin >> numVirus >> numCity;       for (int i = 1; i <= numVirus; i++) cin >> virus[i].city >> virus[i].speed;       for (int i = 1; i <= numCity; i++) cin >> import[i];       compress_tree();       solve();     }   }   