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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 maxn = 1E5 + 100, INF = 1E12;
vector<int> G[maxn];
LL w[maxn];
int n, Q;
namespace sg {
struct Q {
LL setv;
explicit Q(LL setv = -1): setv(setv) {}
void operator += (const Q& q) { if (q.setv != -1) setv = q.setv; }
};
struct P {
LL min;
explicit P(LL min = INF): min(min) {}
void up(Q& q) { if (q.setv != -1) min = q.setv; }
};
template<typename T>
P operator & (T&& a, T&& b) {
return P(min(a.min, b.min));
}
P p[maxn << 2];
Q q[maxn << 2];
#define lson o * 2, l, (l + r) / 2
#define rson o * 2 + 1, (l + r) / 2 + 1, r
void up(int o, int l, int r) {
if (l == r) p[o] = P();
else p[o] = p[o * 2] & p[o * 2 + 1];
p[o].up(q[o]);
}
void down(int o, int l, int r) {
q[o * 2] += q[o]; q[o * 2 + 1] += q[o];
q[o] = Q();
up(lson); up(rson);
}
template<typename T>
void build(T&& f, int o = 1, int l = 1, int r = n) {
if (l == r) q[o] = f(l);
else { build(f, lson); build(f, rson); }
up(o, l, r);
dbg(o, l, r, p[o].min, q[o].setv);
}
P query(int ql, int qr, int o = 1, int l = 1, int r = n) {
if (ql > r || l > qr) return P();
if (ql <= l && r <= qr) return p[o];
down(o, l, r);
return query(ql, qr, lson) & query(ql, qr, rson);
}
void update(int ql, int qr, const Q& v, int o = 1, int l = 1, int r = n) {
if (ql > r || l > qr) return;
if (ql <= l && r <= qr) q[o] += v;
else {
down(o, l, r);
update(ql, qr, v, lson); update(ql, qr, v, rson);
}
up(o, l, r);
}
}
const int SP = 18;
int fa[maxn], dep[maxn], idx[maxn], out[maxn], ridx[maxn], pa[maxn][SP];
namespace hlc {
int sz[maxn], son[maxn], top[maxn], clk;
void predfs(int u, int d) {
dep[u] = d; sz[u] = 1;
pa[u][0] = fa[u]; FOR (i, 1, SP) pa[u][i] = pa[pa[u][i - 1]][i - 1];
int& maxs = son[u] = -1;
for (int& v: G[u]) {
if (v == fa[u]) continue;
fa[v] = u;
predfs(v, d + 1);
sz[u] += sz[v];
if (maxs == -1 || sz[v] > sz[maxs]) maxs = v;
}
}
void dfs(int u, int tp) {
top[u] = tp; idx[u] = ++clk; ridx[clk] = u;
if (son[u] != -1) dfs(son[u], tp);
for (int& v: G[u])
if (v != fa[u] && v != son[u]) dfs(v, v);
out[u] = clk;
}
template<typename T>
int go(int u, int v, T&& f) {
int uu = top[u], vv = top[v];
while (uu != vv) {
if (dep[uu] < dep[vv]) { swap(uu, vv); swap(u, v); }
f(idx[uu], idx[u]);
u = fa[uu]; uu = top[u];
}
if (dep[u] < dep[v]) swap(u, v);
f(idx[v], idx[u]);
return v;
}
int up(int u, int v) {
int dd = dep[u] - dep[v] - 1;
FOR (i, 0, SP) if ((1 << i) & dd) u = pa[u][i];
return u;
}
}
int cap;
int main() {
#ifdef zerol
freopen("in", "r", stdin);
#endif
cin >> n >> Q;
FOR (_, 1, n) {
int u, v; scanf("%d%d", &u, &v);
G[u].push_back(v); G[v].push_back(u);
}
FOR (i, 1, n + 1) scanf("%lld", &w[i]);
fa[1] = 1; hlc::predfs(1, 0); hlc::dfs(1, 1);
sg::build([](int x)->sg::Q { return sg::Q(w[ridx[x]]); });
cin >> cap;
while (Q--) {
int tp; scanf("%d", &tp);
if (tp == 1) scanf("%d", &cap);
else if (tp == 2) {
int u, v; LL k; scanf("%d%d%lld", &u, &v, &k);
hlc::go(u, v, [&](int a, int b) { sg::update(a, b, sg::Q(k)); });
} else {
int x; scanf("%d", &x);
int lca = hlc::go(x, cap, [](int, int) {});
dbg(cap, x, lca);
if (x == cap) printf("%lld\n", sg::query(1, n).min);
else if (lca != x) printf("%lld\n", sg::query(idx[x], out[x]).min);
else {
int t = hlc::up(cap, x);
printf("%lld\n", (sg::query(1, idx[t] - 1) & sg::query(out[t] + 1, n)).min);
}
}
}
}
|