func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 1e5 + 5;   long long n, q, op, root = 1;   long long a[maxn];   long long head[maxn], to[maxn << 1], nxt[maxn << 1], cnt;   inline void add(long long u, long long v) {     nxt[++cnt] = head[u];     to[cnt] = v;     head[u] = cnt;   }   namespace Tree_chain_partition {   long long fa[maxn], son[maxn], size[maxn], dep[maxn], top[maxn];   void dfs1(long long u, long long f) {     size[u] = 1;     fa[u] = f;     dep[u] = dep[f] + 1;     for (register long long i = head[u]; i; i = nxt[i]) {       long long v = to[i];       if (v == f) continue;       dfs1(v, u);       size[u] += size[v];       if (size[v] > size[son[u]]) son[u] = v;     }   }   long long id[maxn], w[maxn], tot;   void dfs2(long long u, long long topf) {     id[u] = ++tot;     w[tot] = a[u];     top[u] = topf;     if (!son[u]) return;     dfs2(son[u], topf);     for (register long long i = head[u]; i; i = nxt[i]) {       long long v = to[i];       if (v == son[u] || v == fa[u]) continue;       dfs2(v, v);     }   }   inline long long lca(long long x, long long y) {     while (top[x] != top[y]) {       if (dep[top[x]] < dep[top[y]]) swap(x, y);       x = fa[top[x]];     }     return dep[x] < dep[y] ? x : y;   }   long long find(long long x, long long y) {     while (top[x] != top[y]) {       if (dep[top[x]] < dep[top[y]]) swap(x, y);       if (fa[top[x]] == y) return top[x];       x = fa[top[x]];     }     return dep[x] < dep[y] ? son[x] : son[y];   }   inline long long LCA(long long x, long long y) {     if (dep[x] > dep[y]) swap(x, y);     if (lca(x, y) == x) {       if (id[y] <= id[root] && id[root] <= id[y] + size[y] - 1) {         return y;       }       if (lca(x, root) == x) return lca(root, y);       return x;     }     if (id[root] >= id[x] && id[root] <= id[x] + size[x] - 1) return x;     if (id[root] >= id[y] && id[root] <= id[y] + size[y] - 1) return y;     if ((lca(x, root) == root && lca(x, y) == lca(root, y)) ||         (lca(y, root) == root && lca(x, y) == lca(root, x))) {       return root;     }     if (lca(x, root) == lca(y, root)) return lca(x, y);     if (lca(x, y) != lca(x, root)) return lca(x, root);     if (lca(x, y) != lca(y, root)) return lca(y, root);   }   }  // namespace Tree_chain_partition   using namespace Tree_chain_partition;   namespace SegmentTree {   struct SegmentTree {     long long v, tag;   } st[maxn << 2];   inline void push_up(long long rt) {     st[rt].v = st[rt << 1].v + st[rt << 1 | 1].v;   }   void build(long long rt, long long l, long long r) {     st[rt].tag = 0;     if (l == r) {       st[rt].v = w[l];       return;     }     long long mid = (l + r) >> 1;     build(rt << 1, l, mid);     build(rt << 1 | 1, mid + 1, r);     push_up(rt);   }   inline void push_down(long long rt, long long l, long long r) {     long long mid = (l + r) >> 1;     st[rt << 1].v += st[rt].tag * (mid - l + 1);     st[rt << 1 | 1].v += st[rt].tag * (r - mid);     st[rt << 1].tag += st[rt].tag;     st[rt << 1 | 1].tag += st[rt].tag;     st[rt].tag = 0;   }   void modify(long long rt, long long l, long long r, long long ql, long long qr,               long long val) {     if (ql > r || qr < l) return;     if (ql <= l && qr >= r) {       st[rt].v += (r - l + 1) * val;       st[rt].tag += val;       return;     }     push_down(rt, l, r);     long long mid = (l + r) >> 1;     modify(rt << 1, l, mid, ql, qr, val);     modify(rt << 1 | 1, mid + 1, r, ql, qr, val);     push_up(rt);   }   long long query(long long rt, long long l, long long r, long long ql,                   long long qr) {     if (ql > r || qr < l) return 0;     if (ql <= l && qr >= r) return st[rt].v;     push_down(rt, l, r);     long long mid = (l + r) >> 1;     return query(rt << 1, l, mid, ql, qr) +            query(rt << 1 | 1, mid + 1, r, ql, qr);   }   void update(long long pos, long long val) {     if (root == pos) {       modify(1, 1, n, 1, n, val);       return;     }     long long tmp = lca(root, pos);     if (tmp != pos) {       modify(1, 1, n, id[pos], id[pos] + size[pos] - 1, val);     } else {       long long loc = find(root, pos);       modify(1, 1, n, 1, n, val);       modify(1, 1, n, id[loc], id[loc] + size[loc] - 1, -val);     }   }   long long ask(long long pos) {     if (pos == root) return query(1, 1, n, 1, n);     long long tmp = lca(pos, root);     if (tmp != pos) {       return query(1, 1, n, id[pos], id[pos] + size[pos] - 1);     }     long long loc = find(root, pos);     return query(1, 1, n, 1, n) -            query(1, 1, n, id[loc], id[loc] + size[loc] - 1);   }   }  // namespace SegmentTree   using namespace SegmentTree;   template <typename T>   inline void read(T &x) {     x = 0;     T f = 1;     char ch = getchar();     while (!isdigit(ch)) {       if (ch ==  - ) f = -1;       ch = getchar();     }     while (isdigit(ch)) {       x = x * 10 + (ch ^ 48);       ch = getchar();     }     x *= f;   }   signed main() {     read(n);     read(q);     for (register long long i = 1; i <= n; i++) {       read(a[i]);     }     for (register long long i = 1, u, v; i < n; i++) {       read(u), read(v);       add(u, v);       add(v, u);     }     dfs1(1, 0);     dfs2(1, 1);     build(1, 1, n);     while (q--) {       read(op);       if (op == 1) read(root);       if (op == 2) {         long long x, y, val;         read(x), read(y), read(val);         update(LCA(x, y), val);       }       if (op == 3) {         long long x;         read(x);         printf( %lld n , ask(x));       }     }     return 0;   }   