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| #include <bits/stdc++.h>
using namespace std;
using LL = long long;
#define FOR(i, x, y) for (decay<decltype(y)>::type i = (x), _##i = (y); i < _##i; ++i)
#define FORD(i, x, y) for (decay<decltype(x)>::type i = (x), _##i = (y); i > _##i; --i)
#ifdef zerol
#define dbg(args...) do { cout << "\033[32;1m" << #args << " -> "; err(args); } while (0)
#else
#define dbg(...)
#endif
void err() { cout << "\033[39;0m" << endl; }
template<template<typename...> class T, typename t, typename... Args>
void err(T<t> a, Args... args) { for (auto x: a) cout << x << ' '; err(args...); }
template<typename T, typename... Args>
void err(T a, Args... args) { cout << a << ' '; err(args...); }
// -----------------------------------------------------------------------------
const int N = 5E4 + 10, INF = 1E9 + 1;
int w[N];
struct E {
int to, d;
};
vector<int> G[N];
bool vis[N];
int sz[N];
int get_sz(int u, int fa) {
int& s = sz[u] = 1;
for (int& v: G[u]) {
if (vis[v] || v == fa) continue;
s += get_sz(v, u);
}
return s;
}
void get_rt(int u, int fa, int s, int& m, int& rt) {
int t = s - sz[u];
for (int& v: G[u]) {
if (vis[v] || v == fa) continue;
get_rt(v, u, s, m, rt);
t = max(t, sz[v]);
}
if (t < m) { m = t; rt = u; }
}
int dep[N];
void get_dep(int u, int fa, int d) {
dep[u] = d;
for (int& v: G[u]) {
if (vis[v] || v == fa) continue;
get_dep(v, u, d + 1);
}
}
struct P {
int w;
int d, trt;
};
bool operator < (const P& a, const P& b) { return a.d < b.d; }
using VP = vector<P>;
struct R {
VP *rt, *rt2;
int dep;
};
VP pool[N << 1], *pit = pool;
vector<R> tr[N];
void go(int u, int fa, VP* rt, VP* rt2) {
tr[u].push_back({rt, rt2, dep[u]});
for (int& v: G[u]) {
if (v == fa || vis[v]) continue;
go(v, u, rt, rt2);
}
}
void dfs(int u) {
int tmp = INF; get_rt(u, -1, get_sz(u, -1), tmp, u);
vis[u] = true;
get_dep(u, -1, 0);
VP* rt = pit++; tr[u].push_back({rt, nullptr, 0});
for (int& v: G[u]) {
if (vis[v]) continue;
go(v, u, rt, pit++);
dfs(v);
}
}
typedef vector<int> VI;
struct TREE {
#define mid ((l + r) >> 1)
#define lson l, mid
#define rson mid + 1, r
static const int MAGIC = 750 * N;
struct P {
int w, ls, rs;
} tr[MAGIC];
int sz = 1;
TREE() { tr[0] = {0, 0, 0}; }
int New(int w, int ls, int rs) {
assert(sz < MAGIC - 1);
tr[sz] = {w, ls, rs};
return sz++;
}
int add(int tt, int l, int r, int x, int d) {
if (x < l || r < x) return tt;
const P& t = tr[tt];
if (l == r) return New(t.w + d, 0, 0);
return New(t.w + d, add(t.ls, lson, x, d), add(t.rs, rson, x, d));
}
int ls_sum(const VI& rt) {
int ret = 0;
FOR (i, 0, rt.size())
ret += tr[tr[rt[i]].ls].w;
return ret;
}
inline void ls(VI& rt) { for (int& x: rt) x = tr[x].ls; }
inline void rs(VI& rt) { for (int& x: rt) x = tr[x].rs; }
int query(VI& p, VI& q, int l, int r, int k) {
if (l == r) return l;
int w = ls_sum(q) - ls_sum(p);
if (k <= w) {
ls(p); ls(q);
return query(p, q, lson, k);
}
else {
rs(p); rs(q);
return query(p, q, rson, k - w);
}
}
} tree;
inline int get_trt(VP& x, int v) {
return (--upper_bound(x.begin(), x.end(), P{-1, v, -1}))->trt;
}
vector<int> tt;
int main() {
#ifdef zerol
freopen("in", "r", stdin);
#endif
int n; cin >> n;
FOR (i, 1, n + 1) {
scanf("%d", &w[i]);
tt.push_back(w[i]);
}
sort(tt.begin(), tt.end());
tt.erase(unique(tt.begin(), tt.end()), tt.end());
FOR (i, 1, n + 1) w[i] = lower_bound(tt.begin(), tt.end(), w[i]) - tt.begin() + 1;
FOR (_, 1, n) {
int u, v; scanf("%d%d", &u, &v);
G[u].push_back(v); G[v].push_back(u);
}
dfs(1);
FOR (i, 1, n + 1)
for (R& x: tr[i]) {
x.rt->push_back({w[i], x.dep, -1});
if (x.rt2) x.rt2->push_back({w[i], x.dep, -1});
}
FOR (it, pool, pit) {
it->push_back({0, -1, 0});
sort(it->begin(), it->end());
FOR (i, 1, it->size()) {
VP &x = *it;
x[i].trt = tree.add(x[i - 1].trt, 1, N, x[i].w, 1);
}
}
int Qn; cin >> Qn;
VI q, p;
while (Qn--) {
int u, d, k; scanf("%d%d%d", &u, &d, &k);
q.clear(); p.clear();
for (R& x: tr[u]) {
if (d - x.dep < 0) continue;
q.push_back(get_trt(*x.rt, d - x.dep));
if (x.rt2) p.push_back(get_trt(*x.rt2, d - x.dep));
}
int ans = tree.query(p, q, 1, N, k);
printf("%d\n", ans == N ? -1 : tt[ans - 1]);
}
}
|