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| #include <iostream>
#include <cstdio>
#define maxn 100010
#define INF 1000000000
#define lowbit(i) ((i) & (-i))
using namespace std;
int n, m, a[maxn];
struct Edge {
int to, next;
} e[maxn * 2]; int c1, head[maxn];
inline void add_edge(int u, int v) {
e[c1].to = v; e[c1].next = head[u]; head[u] = c1++;
}
int R[maxn]; bool vis[maxn];
struct Calc_sz {
int f[maxn], sz[maxn];
int sum, rt, maxdp;
void init() { f[rt = 0] = INF; }
void dfs_sz(int u, int fa) {
sz[u] = 1;
for (int i = head[u]; ~i; i = e[i].next) {
int v = e[i].to; if (v == fa || vis[v]) continue;
dfs_sz(v, u); sz[u] += sz[v];
}
}
void dfs(int u, int fa) {
f[u] = 0;
for (int i = head[u]; ~i; i = e[i].next) {
int v = e[i].to; if (v == fa || vis[v]) continue;
dfs(v, u); f[u] = max(f[u], sz[v]);
} f[u] = max(f[u], sum - sz[u]);
if (f[u] < f[rt]) rt = u;
}
void dfs(int u, int fa, int d) {
maxdp = max(maxdp, d);
for (int i = head[u]; ~i; i = e[i].next) {
int v = e[i].to; if (v == fa || vis[v]) continue;
dfs(v, u, d + 1);
}
}
inline int get_rt(int u) {
rt = maxdp = 0; dfs_sz(u, 0); sum = sz[u];
dfs(u, 0); dfs(rt, 0, 0); R[rt] = maxdp; return rt;
}
} _;
int id[maxn * 2], in[maxn], dep[maxn];
void dfs(int u, int fa) {
static int cnt = 0;
id[++cnt] = u; in[u] = cnt;
for (int i = head[u]; ~i; i = e[i].next) {
int v = e[i].to; if (v == fa) continue;
dep[v] = dep[u] + 1; dfs(v, u); id[++cnt] = u;
}
}
inline int st_min(int l, int r) { return in[l] < in[r] ? l : r; }
int st[maxn * 2][20], Log[maxn * 2];
void init_st(int n) { Log[0] = -1;
for (int i = 1; i <= n; ++i) Log[i] = Log[i >> 1] + 1;
for (int i = 1; i <= n; ++i) st[i][0] = id[i];
for (int j = 1; j <= 20; ++j)
for (int i = 1; i + (1 << j) - 1 <= n; ++i)
st[i][j] = st_min(st[i][j - 1], st[i + (1 << j - 1)][j - 1]);
}
inline int get_lca(int l, int r) {
l = in[l]; r = in[r]; if (l > r) swap(l, r);
int k = Log[r - l + 1];
return st_min(st[l][k], st[r - (1 << k) + 1][k]);
}
inline int D(int x, int y) { return dep[x] + dep[y] - 2 * dep[get_lca(x, y)]; }
struct Bit {
int *Bit, n;
void init(int _n) { static int P[maxn * 60], *ret = P; Bit = ret; ret += (n = _n) + 1; }
void add(int i, int v) { ++i; while (i <= n) Bit[i] += v, i += lowbit(i); }
int get_sum(int i) {
int s = 0; i = min(i + 1, n);
while (i) s += Bit[i], i -= lowbit(i);
return s;
}
} Bit[maxn * 2];
int fa[maxn];
void divide(int u) {
vis[u] = 1; Bit[u].init(R[u] + 1);
for (int i = head[u]; ~i; i = e[i].next) {
int v = e[i].to; if (vis[v]) continue;
v = _.get_rt(v); fa[v] = u; Bit[v + n].init(R[u] + 1);
divide(v);
}
}
void update(int u, int v) {
int x = u; Bit[u].add(0, v);
while (fa[u]) {
int dis = D(fa[u], x);
Bit[fa[u]].add(dis, v);
Bit[u + n].add(dis, v);
u = fa[u];
}
}
int query(int u, int k) {
int x = u, s = Bit[u].get_sum(k);
while (fa[u]) {
int dis = D(fa[u], x); if (dis > k) { u = fa[u]; continue; }
s += Bit[fa[u]].get_sum(k - dis);
s -= Bit[u + n].get_sum(k - dis);
u = fa[u];
}
return s;
}
int lans;
inline void solve_1() {
int x, y; cin >> x >> y; x ^= lans; y ^= lans;
cout << (lans = query(x, y)) << "\n";
}
inline void solve_2() {
int x, y; cin >> x >> y; x ^= lans; y ^= lans;
update(x, y - a[x]); a[x] = y;
}
int main() { fill(head, head + maxn, -1);
ios::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
cin >> n >> m;
for (int i = 1; i <= n; ++i) cin >> a[i];
for (int i = 1; i < n; ++i) {
int x, y; cin >> x >> y;
add_edge(x, y); add_edge(y, x);
} dep[1] = 1; dfs(1, 0); init_st(2 * n - 1);
_.init(); divide(_.get_rt(1));
for (int i = 1; i <= n; ++i) update(i, a[i]);
for (int i = 1; i <= m; ++i) {
int opt; cin >> opt;
if (opt == 0) solve_1();
else solve_2();
}
return 0;
}
|