using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using static System.Math;
using System.Text;
using System.Threading;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using Library;

namespace Program
{
    public static class ProblemA
    {
        static bool SAIKI = false;
        static public int numberOfRandomCases = 0;
        static public void MakeTestCase(List<string> _input, List<string> _output, ref Func<string[], bool> _outputChecker)
        {
        }
        static public void Solve()
        {
            var N = NN;
            var AList = NSList(N);
            var uv = Repeat(0, N - 1).Select(_ => new { u = NN - 1, v = NN - 1 }).ToArray();
            var tree = new LIB_Tree(N);
            foreach (var item in uv)
            {
                tree.AddPath(item.u, item.v);
            }
            var dp = tree.LIB_ReRooting<(LIB_Mod998244353 keta, LIB_Mod998244353 val)>()
                    .MergeSubtrees((s, t) =>
                    {
                        return (s.keta + t.keta, s.val + t.val);
                    }).MergeVertexAndSubtree((v, s) =>
                    {
                        return (s.keta * v.keta + v.keta, s.keta * v.val + v.val + s.val);
                    }).VertexToValue(idx =>
                    {
                        return (LIB_Mod998244353.Pow(10, AList[idx].Length), long.Parse(AList[idx]));
                    }).Build();
            LIB_Mod998244353 ans = 0;
            for (var i = 0; i < N; ++i)
            {
                ans += dp[i, -1].val;
            }
            Console.WriteLine(ans);
        }
        class Printer : StreamWriter
        {
            public override IFormatProvider FormatProvider { get { return CultureInfo.InvariantCulture; } }
            public Printer(Stream stream) : base(stream, new UTF8Encoding(false, true)) { base.AutoFlush = false; }
            public Printer(Stream stream, Encoding encoding) : base(stream, encoding) { base.AutoFlush = false; }
        }
        static LIB_FastIO fastio = new LIB_FastIODebug();
        static string[] args;
        static public void Main(string[] args_t) { args = args_t; if (args_t.Length == 0) { fastio = new LIB_FastIO(); Console.SetOut(new Printer(Console.OpenStandardOutput())); } if (SAIKI) { var t = new Thread(Solve, 134217728); t.Start(); t.Join(); } else Solve(); Console.Out.Flush(); }
        static long NN => fastio.Long();
        static double ND => fastio.Double();
        static string NS => fastio.Scan();
        static long[] NNList(long N) => Repeat(0, N).Select(_ => NN).ToArray();
        static double[] NDList(long N) => Repeat(0, N).Select(_ => ND).ToArray();
        static string[] NSList(long N) => Repeat(0, N).Select(_ => NS).ToArray();
        static long Count<T>(this IEnumerable<T> x, Func<T, bool> pred) => Enumerable.Count(x, pred);
        static IEnumerable<T> Repeat<T>(T v, long n) => Enumerable.Repeat<T>(v, (int)n);
        static IEnumerable<int> Range(long s, long c) => Enumerable.Range((int)s, (int)c);
        static IOrderedEnumerable<T> OrderByRand<T>(this IEnumerable<T> x) => Enumerable.OrderBy(x, _ => xorshift);
        static IOrderedEnumerable<T> OrderBy<T>(this IEnumerable<T> x) => Enumerable.OrderBy(x.OrderByRand(), e => e);
        static IOrderedEnumerable<T1> OrderBy<T1, T2>(this IEnumerable<T1> x, Func<T1, T2> selector) => Enumerable.OrderBy(x.OrderByRand(), selector);
        static IOrderedEnumerable<T> OrderByDescending<T>(this IEnumerable<T> x) => Enumerable.OrderByDescending(x.OrderByRand(), e => e);
        static IOrderedEnumerable<T1> OrderByDescending<T1, T2>(this IEnumerable<T1> x, Func<T1, T2> selector) => Enumerable.OrderByDescending(x.OrderByRand(), selector);
        static IOrderedEnumerable<string> OrderBy(this IEnumerable<string> x) => x.OrderByRand().OrderBy(e => e, StringComparer.OrdinalIgnoreCase);
        static IOrderedEnumerable<T> OrderBy<T>(this IEnumerable<T> x, Func<T, string> selector) => x.OrderByRand().OrderBy(selector, StringComparer.OrdinalIgnoreCase);
        static IOrderedEnumerable<string> OrderByDescending(this IEnumerable<string> x) => x.OrderByRand().OrderByDescending(e => e, StringComparer.OrdinalIgnoreCase);
        static IOrderedEnumerable<T> OrderByDescending<T>(this IEnumerable<T> x, Func<T, string> selector) => x.OrderByRand().OrderByDescending(selector, StringComparer.OrdinalIgnoreCase);
        static string Join<T>(this IEnumerable<T> x, string separator = "") => string.Join(separator, x);
        static uint xorshift { get { _xsi.MoveNext(); return _xsi.Current; } }
        static IEnumerator<uint> _xsi = _xsc();
        static IEnumerator<uint> _xsc() { uint x = 123456789, y = 362436069, z = 521288629, w = (uint)(DateTime.Now.Ticks & 0xffffffff); while (true) { var t = x ^ (x << 11); x = y; y = z; z = w; w = (w ^ (w >> 19)) ^ (t ^ (t >> 8)); yield return w; } }
        static bool Chmax<T>(this ref T lhs, T rhs) where T : struct, IComparable<T> { if (lhs.CompareTo(rhs) < 0) { lhs = rhs; return true; } return false; }
        static bool Chmin<T>(this ref T lhs, T rhs) where T : struct, IComparable<T> { if (lhs.CompareTo(rhs) > 0) { lhs = rhs; return true; } return false; }
        static void Fill<T>(this T[] array, T value) => array.AsSpan().Fill(value);
        static void Fill<T>(this T[,] array, T value) => MemoryMarshal.CreateSpan(ref array[0, 0], array.Length).Fill(value);
        static void Fill<T>(this T[,,] array, T value) => MemoryMarshal.CreateSpan(ref array[0, 0, 0], array.Length).Fill(value);
        static void Fill<T>(this T[,,,] array, T value) => MemoryMarshal.CreateSpan(ref array[0, 0, 0, 0], array.Length).Fill(value);
    }
}
namespace Library {
    partial class LIB_Tree
    {
        int N;
        List<int>[] path;
        Dictionary<int, int>[] pathWithCount;
        List<(int u, int v)> edges;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public LIB_Tree(long n)
        {
            N = (int)n;
            path = Enumerable.Repeat(0, N).Select(_ => new List<int>()).ToArray();
            pathWithCount = Enumerable.Repeat(0, N).Select(_ => new Dictionary<int, int>()).ToArray();
            edges = new List<(int u, int v)>();
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void AddPath(long u, long v)
        {
            if (u >= N || v >= N) throw new Exception();
            path[u].Add((int)v);
            path[v].Add((int)u);
            pathWithCount[u].Add((int)v, edges.Count);
            pathWithCount[v].Add((int)u, edges.Count);
            edges.Add(((int)u, (int)v));
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public int[] GetSurround(long u) => path[u].ToArray();
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public List<(long node, long parent)> BFSFromRoot(long root)
        {
            var bfsList = new List<(long node, long parent)>();
            var q = new Queue<int>();
            var done = new bool[N];
            bfsList.Add((root, -1));
            done[root] = true;
            q.Enqueue((int)root);
            while (q.Count > 0)
            {
                var w = q.Dequeue();
                foreach (var edge in pathWithCount[w])
                {
                    var i = edge.Key;
                    if (done[i]) continue;
                    done[i] = true;
                    q.Enqueue(i);
                    bfsList.Add((i, w));
                }
            }
            return bfsList;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public long[] GetDistanceFrom(long root)
        {
            var ret = new long[N];
            foreach (var item in BFSFromRoot(root))
            {
                if (item.parent == -1) continue;
                ret[item.node] = ret[item.parent] + 1;
            }
            return ret;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public int[] GetJuusin()
        {
            var center = new List<int>();
            var dp = new long[N];
            foreach (var item in BFSFromLeaf(0))
            {
                dp[item.node] += 1;
                var ok = false;
                foreach (var edge in path[item.node])
                {
                    var idx = edge;
                    if (idx == item.parent) continue;
                    dp[item.node] += dp[idx];
                    if (dp[idx] <= N / 2) ok = true;
                }
                if (ok)
                {
                    if (N - dp[item.node] <= N / 2)
                    {
                        center.Add((int)item.node);
                    }
                }
            }
            return center.ToArray();
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public int[] GetTyokkei()
        {
            var dist1 = GetDistanceFrom(0);
            var maxPos = 0;
            var maxDist = 0L;
            for (var i = 0; i < N; i++)
            {
                if (maxDist < dist1[i])
                {
                    maxDist = dist1[i];
                    maxPos = i;
                }
            }
            var dist2 = new int[N];
            var parent = new int[N];
            maxDist = 0;
            var anotherMaxPos = 0L;
            foreach (var item in BFSFromRoot(maxPos))
            {
                parent[item.node] = (int)item.parent;
                if (item.parent == -1) continue;
                dist2[item.node] = dist2[item.parent] + 1;
                if (maxDist < dist2[item.node])
                {
                    maxDist = dist2[item.node];
                    anotherMaxPos = item.node;
                }
            }
            var nownode = (int)anotherMaxPos;
            var ret = new List<int>();
            while (nownode != -1)
            {
                ret.Add(nownode);
                nownode = parent[nownode];
            }
            return ret.ToArray();
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public List<(long node, long parent)> BFSFromLeaf(long root) => BFSFromRoot(root).ToArray().Reverse().ToList();
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public (long node, long parent, long direction)[] EulerTour(long root)
        {
            var eulerList = new (long node, long parent, long direction)[N << 1];
            ref var eulerListRef = ref eulerList[0];
            var stack = new int[N << 1];
            ref var stackref = ref stack[0];
            var si = 0;
            Unsafe.Add(ref stackref, si++) = (int)root + 1;
            var idx = 0;
            var par = new int[N];
            ref var parref = ref par[0];
            Unsafe.Add(ref parref, (int)root) = -1;
            while (si > 0)
            {
                var vtx = Unsafe.Add(ref stackref, --si);
                if (vtx < 0)
                {
                    vtx *= -1;
                    --vtx;
                    Unsafe.Add(ref eulerListRef, idx) = (vtx, Unsafe.Add(ref parref, vtx), -1);
                }
                else
                {
                    Unsafe.Add(ref stackref, si++) = -vtx;
                    --vtx;
                    var pare = Unsafe.Add(ref parref, vtx);
                    Unsafe.Add(ref eulerListRef, idx) = (vtx, pare, 1);
                    foreach (var edge in path[vtx])
                    {
                        var item = edge;
                        if (item == pare) continue;
                        Unsafe.Add(ref parref, item) = vtx;
                        Unsafe.Add(ref stackref, si++) = item + 1;
                    }
                }
                ++idx;
            }
            return eulerList;
        }
    }
    partial struct LIB_Mod998244353 : IEquatable<LIB_Mod998244353>, IEquatable<long>
    {
        const int _mod = 998244353; long v;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public LIB_Mod998244353(long x)
        {
            if (x < _mod && x >= 0) v = x;
            else if ((v = x % _mod) < 0) v += _mod;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public implicit operator LIB_Mod998244353(long x) => new LIB_Mod998244353(x);
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public implicit operator long(LIB_Mod998244353 x) => x.v;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void Add(LIB_Mod998244353 x) { if ((v += x.v) >= _mod) v -= _mod; }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void Sub(LIB_Mod998244353 x) { if ((v -= x.v) < 0) v += _mod; }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void Mul(LIB_Mod998244353 x) => v = (v * x.v) % _mod;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void Div(LIB_Mod998244353 x) => v = (v * Inverse(x.v)) % _mod;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public LIB_Mod998244353 operator +(LIB_Mod998244353 x, LIB_Mod998244353 y) { var t = x.v + y.v; return t >= _mod ? new LIB_Mod998244353 { v = t - _mod } : new LIB_Mod998244353 { v = t }; }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public LIB_Mod998244353 operator -(LIB_Mod998244353 x, LIB_Mod998244353 y) { var t = x.v - y.v; return t < 0 ? new LIB_Mod998244353 { v = t + _mod } : new LIB_Mod998244353 { v = t }; }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public LIB_Mod998244353 operator *(LIB_Mod998244353 x, LIB_Mod998244353 y) => x.v * y.v;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public LIB_Mod998244353 operator /(LIB_Mod998244353 x, LIB_Mod998244353 y) => x.v * Inverse(y.v);
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public bool operator ==(LIB_Mod998244353 x, LIB_Mod998244353 y) => x.v == y.v;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public bool operator !=(LIB_Mod998244353 x, LIB_Mod998244353 y) => x.v != y.v;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public long Inverse(long x)
        {
            long b = _mod, r = 1, u = 0, t = 0;
            while (b > 0)
            {
                var q = x / b;
                t = u;
                u = r - q * u;
                r = t;
                t = b;
                b = x - q * b;
                x = t;
            }
            return r < 0 ? r + _mod : r;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public bool Equals(LIB_Mod998244353 x) => v == x.v;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public bool Equals(long x) => v == x;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public override bool Equals(object x) => x == null ? false : Equals((LIB_Mod998244353)x);
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public override int GetHashCode() => v.GetHashCode();
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public override string ToString() => v.ToString();
        static List<LIB_Mod998244353> _fact = new List<LIB_Mod998244353>() { 1, 1 };
        static List<LIB_Mod998244353> _inv = new List<LIB_Mod998244353>() { 0, 1 };
        static List<LIB_Mod998244353> _factinv = new List<LIB_Mod998244353>() { 1, 1 };
        static long _factm = _mod;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static void B(long n)
        {
            if (_factm != _mod)
            {
                _fact = new List<LIB_Mod998244353>() { 1, 1 };
                _inv = new List<LIB_Mod998244353>() { 0, 1 };
                _factinv = new List<LIB_Mod998244353>() { 1, 1 };
            }
            if (n >= _fact.Count)
            {
                for (int i = _fact.Count; i <= n; ++i)
                {
                    _fact.Add(_fact[i - 1] * i);
                    _inv.Add(_mod - _inv[(int)(_mod % i)] * (_mod / i));
                    _factinv.Add(_factinv[i - 1] * _inv[i]);
                }
            }
            _factm = _mod;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public LIB_Mod998244353 Comb(long n, long k)
        {
            B(n);
            if (n == 0 && k == 0) return 1;
            if (n < k || n < 0) return 0;
            return _fact[(int)n] * _factinv[(int)(n - k)] * _factinv[(int)k];
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public LIB_Mod998244353 CombOK(long n, long k)
        {
            LIB_Mod998244353 ret = 1;
            LIB_Mod998244353 deno = 1;
            var chk = n - k;
            if (chk < k) k = chk;
            for (var i = 0; i < k; i++) ret *= n - i;
            for (var i = 1; i <= k; i++) deno *= i;
            return ret / deno;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public LIB_Mod998244353 Perm(long n, long k)
        {
            B(n);
            if (n == 0 && k == 0) return 1;
            if (n < k || n < 0) return 0;
            return _fact[(int)n] * _factinv[(int)(n - k)];
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public LIB_Mod998244353 KanzenPerm(long n, long k) => Enumerable.Range(0, (int)k + 1).Aggregate((LIB_Mod998244353)0, (a, e) => a + (1 - ((e & 1) << 1)) * LIB_Mod998244353.Comb(k, e) * LIB_Mod998244353.Perm(n - e, k - e));
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        static public LIB_Mod998244353 Pow(LIB_Mod998244353 x, long y)
        {
            LIB_Mod998244353 a = 1;
            while (y != 0)
            {
                if ((y & 1) == 1) a.Mul(x);
                x.Mul(x);
                y >>= 1;
            }
            return a;
        }
    }
    class LIB_FastIO
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public LIB_FastIO() { str = Console.OpenStandardInput(); }
        readonly Stream str;
        readonly byte[] buf = new byte[2048];
        int len, ptr;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        byte read()
        {
            if (ptr >= len)
            {
                ptr = 0;
                if ((len = str.Read(buf, 0, 2048)) <= 0)
                {
                    return 0;
                }
            }
            return buf[ptr++];
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        char Char()
        {
            byte b = 0;
            do b = read();
            while (b < 33 || 126 < b);
            return (char)b;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        virtual public string Scan()
        {
            var sb = new StringBuilder();
            for (var b = Char(); b >= 33 && b <= 126; b = (char)read())
                sb.Append(b);
            return sb.ToString();
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        virtual public long Long()
        {
            long ret = 0; byte b = 0; var ng = false;
            do b = read();
            while (b != '-' && (b < '0' || '9' < b));
            if (b == '-') { ng = true; b = read(); }
            for (; true; b = read())
            {
                if (b < '0' || '9' < b)
                    return ng ? -ret : ret;
                else ret = (ret << 3) + (ret << 1) + b - '0';
            }
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        virtual public double Double() { return double.Parse(Scan(), CultureInfo.InvariantCulture); }
    }
    class LIB_FastIODebug : LIB_FastIO
    {
        Queue<string> param = new Queue<string>();
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        string NextString() { if (param.Count == 0) foreach (var item in Console.ReadLine().Split(' ')) param.Enqueue(item); return param.Dequeue(); }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public LIB_FastIODebug() { }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public override string Scan() => NextString();
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public override long Long() => long.Parse(NextString());
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public override double Double() => double.Parse(NextString());
    }
    // copy key class LIB_ReRooting
    partial class /* not copy key */ LIB_Tree
    {
        /// <summary>
        /// 全方位木DP
        /// </summary>
        /// <returns>2次元配列[node, parent]の部分木のDP値。parent=-1はnodeをルートとした木の値</returns>
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public CReRooting<T> LIB_ReRooting<T>() => new CReRooting<T>(this);
        public class CReRooting<T>
        {
            LIB_Tree tree;
            Dictionary<int, T>[] dp;
            Func<T, T, T> f;
            Func<long, T> g;
            Func<long, long, T, T> g2;
            Func<T, T, T> h;
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public CReRooting(LIB_Tree tree)
            {
                this.tree = tree;
                dp = Enumerable.Repeat(0, tree.N).Select(_ => new Dictionary<int, T>()).ToArray();
                f = (x, y) => throw new NotImplementedException();
                g = v => throw new NotImplementedException();
                g2 = (r, p, v) => v;
                h = (v, t) => t;
            }
            public T this[long vtx, long parent]
            {
                [MethodImpl(MethodImplOptions.AggressiveInlining)]
                get { return dp[vtx][(int)parent]; }
            }
            /// <summary>
            /// 部分木と部分木のマージ(subtree, subtree)するメソッドを設定
            /// </summary>
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public CReRooting<T> MergeSubtrees(Func<T, T, T> mergeSubTrees) { f = mergeSubTrees; return this; }
            /// <summary>
            /// 頂点番号から値を取得するメソッドを設定
            /// </summary>
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public CReRooting<T> VertexToValue(Func<long, T> idxToVal) { g = idxToVal; return this; }
            /// <summary>
            /// 頂点番号(root, parent)で表す辺とrootをルートとする部分木をマージするメソッドを設定
            /// </summary>
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public CReRooting<T> MergeEdgeAndSubtree(Func<long, long, T, T> mergeEdgeAndSubtree) { g2 = mergeEdgeAndSubtree; return this; }
            /// <summary>
            /// 頂点と部分木の結果をマージ(vertex, subtrees)するメソッドを設定
            /// </summary>
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public CReRooting<T> MergeVertexAndSubtree(Func<T, T, T> mergeVertexAndSubtree) { h = mergeVertexAndSubtree; return this; }
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public CReRooting<T> Build()
            {
                var done = new bool[tree.N];
                Action<long, long, T> upd = (vtx, rt, val) =>
                {
                    if (vtx == -1) return;
                    if (done[vtx]) dp[vtx][-1] = f(dp[vtx][-1], g2(rt, vtx, val));
                    else dp[vtx][-1] = g2(rt, vtx, val);
                    done[vtx] = true;
                };
                foreach (var item in tree.BFSFromLeaf(0))
                {
                    var ary = tree.path[item.node].Where(e => e != item.parent).ToArray();
                    var val = g(item.node);
                    if (ary.Length > 0)
                    {
                        var acc = g2(ary[0], item.node, dp[ary[0]][(int)item.node]);
                        foreach (var item2 in ary.Skip(1)) acc = f(acc, g2(item2, item.node, dp[item2][(int)item.node]));
                        val = h(val, acc);
                    }
                    upd(item.parent, item.node, dp[item.node][(int)item.parent] = val);
                }
                var swag = new LIB_SlidingWindowAggregation<T>(f);
                Action<int, int> process = (node, parent) =>
                {
                    var val = g(node);
                    if (tree.path[node].Count == 1)
                    {
                        var x = tree.path[node][0];
                        if (x != parent) upd(x, node, dp[node][x] = val);
                    }
                    else if (tree.path[node].Count == 2)
                    {
                        var x = tree.path[node][0]; var y = tree.path[node][1];
                        if (x != parent) upd(x, node, dp[node][x] = h(val, g2(y, node, dp[y][node])));
                        if (y != parent) upd(y, node, dp[node][y] = h(val, g2(x, node, dp[x][node])));
                    }
                    else if (tree.path[node].Count == 3)
                    {
                        var x = tree.path[node][0]; var y = tree.path[node][1]; var z = tree.path[node][2];
                        if (x != parent) upd(x, node, dp[node][x] = h(val, f(g2(y, node, dp[y][node]), g2(z, node, dp[z][node]))));
                        if (y != parent) upd(y, node, dp[node][y] = h(val, f(g2(x, node, dp[x][node]), g2(z, node, dp[z][node]))));
                        if (z != parent) upd(z, node, dp[node][z] = h(val, f(g2(x, node, dp[x][node]), g2(y, node, dp[y][node]))));
                    }
                    else if (tree.path[node].Count == 4)
                    {
                        var x = tree.path[node][0]; var y = tree.path[node][1]; var z = tree.path[node][2]; var w = tree.path[node][3];
                        var xy = f(g2(x, node, dp[x][node]), g2(y, node, dp[y][node]));
                        var zw = f(g2(z, node, dp[z][node]), g2(w, node, dp[w][node]));
                        if (x != parent) upd(x, node, dp[node][x] = h(val, f(g2(y, node, dp[y][node]), zw)));
                        if (y != parent) upd(y, node, dp[node][y] = h(val, f(g2(x, node, dp[x][node]), zw)));
                        if (z != parent) upd(z, node, dp[node][z] = h(val, f(xy, g2(w, node, dp[w][node]))));
                        if (w != parent) upd(w, node, dp[node][w] = h(val, f(xy, g2(z, node, dp[z][node]))));
                    }
                    else
                    {
                        swag.Clear();
                        var pre = new T[tree.path[node].Count];
                        for (var i = 0; i < pre.Length; ++i) swag.PushBack(pre[i] = g2(tree.path[node][i], node, dp[tree.path[node][i]][node]));
                        for (var i = 0; i < pre.Length; ++i)
                        {
                            var item2 = tree.path[node][i];
                            swag.PopFront();
                            if (item2 != parent) upd(item2, node, dp[node][item2] = h(val, swag.Aggregate()));
                            swag.PushBack(pre[i]);
                        }
                    }
                };
                foreach (var item in tree.BFSFromRoot(0)) process((int)item.node, (int)item.parent);
                for (var i = 1; i < tree.N; i++) dp[i][-1] = done[i] ? h(g(i), dp[i][-1]) : g(i);
                return this;
            }
        }
    }
    class LIB_SlidingWindowAggregation<T>
    {
        T[][] list;
        T[][] agg;
        int[] size;
        Func<T, T, T> fun;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public LIB_SlidingWindowAggregation(IEnumerable<T> ary, Func<T, T, T> f)
        {
            list = new T[2][]; agg = new T[2][]; size = new int[2];
            fun = f;
            list[0] = new T[16]; agg[0] = new T[16]; size[0] = 0;
            if (ary.Any())
            {
                var temp = ary.ToArray();
                size[1] = temp.Length;
                list[1] = new T[size[1]];
                agg[1] = new T[size[1]];
                for (var i = 0; i < list[1].Length; i++)
                {
                    list[1][i] = temp[i];
                    if (i == 0) agg[1][i] = temp[i];
                    else agg[1][i] = fun(agg[1][i - 1], temp[i]);
                }
            }
            else
            {
                list[1] = new T[16]; agg[1] = new T[16]; size[1] = 0;
            }
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public LIB_SlidingWindowAggregation(Func<T, T, T> f) : this(new T[0], f) { }
        public int Count => size[0] + size[1];
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void Clear()
        {
            size[0] = size[1] = 0;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        void Push(int lista, T val)
        {
            if (list[lista].Length == size[lista])
            {
                var newAry = new T[size[lista] * 2];
                var newAgg = new T[size[lista] * 2];
                Array.Copy(list[lista], newAry, size[lista]);
                Array.Copy(agg[lista], newAgg, size[lista]);
                list[lista] = newAry;
                agg[lista] = newAgg;
            }
            if (size[lista] == 0) agg[lista][0] = val;
            else if (lista == 0) agg[lista][size[lista]] = fun(val, agg[lista][size[lista] - 1]);
            else agg[lista][size[lista]] = fun(agg[lista][size[lista] - 1], val);
            list[lista][size[lista]++] = val;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void PushBack(T val) => Push(1, val);
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void PushFront(T val) => Push(0, val);
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        T Pop(int lista)
        {
            var listb = 1 - lista;
            if (size[lista] == 0)
            {
                if (size[listb] == 0) throw new Exception();
                var mid = (size[listb] - 1) / 2;
                if (list[lista].Length <= mid)
                {
                    list[lista] = new T[mid + 1];
                    agg[lista] = new T[mid + 1];
                }
                size[lista] = 0;
                for (var i = mid; i >= 0; i--)
                {
                    if (size[lista] == 0) agg[lista][size[lista]] = list[listb][i];
                    else if (lista == 0) agg[lista][size[lista]] = fun(list[listb][i], agg[lista][size[lista] - 1]);
                    else agg[lista][size[lista]] = fun(agg[lista][size[lista] - 1], list[listb][i]);
                    list[lista][size[lista]++] = list[listb][i];
                }
                for (var i = mid + 1; i < size[listb]; i++)
                {
                    var idx = i - mid - 1;
                    if (idx == 0) agg[listb][idx] = list[listb][i];
                    else if (lista == 0) agg[listb][idx] = fun(list[listb][i], agg[listb][idx - 1]);
                    else agg[listb][idx] = fun(agg[listb][idx - 1], list[listb][i]);
                    list[listb][idx] = list[listb][i];
                }
                size[listb] -= size[lista];
            }
            return list[lista][--size[lista]];
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public T PopBack() => Pop(1);
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public T PopFront() => Pop(0);
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public T Aggregate()
        {
            if (size[0] == 0 && size[1] == 0) throw new Exception();
            else if (size[1] == 0) return agg[0][size[0] - 1];
            else if (size[0] == 0) return agg[1][size[1] - 1];
            else return fun(agg[0][size[0] - 1], agg[1][size[1] - 1]);
        }
    }
}