namespace AtCoder;

#nullable enable

using System.Numerics;

static class Extensions
{
    public static T[] Repeat<T>(this int time, Func<T> F) => Enumerable.Range(0, time).Select(_ => F()).ToArray();
}

class AtCoder
{
    const int Mod = 998244353;
    const int Half = (Mod + 1) / 2;
    object? Solve()
    {
        var n = Int();
        var az = n.Repeat(Input<long>);
        var g = n.Repeat(() => new List<int>());
        for (var i = 0; i < n - 1; i++)
        {
            var u = Int() - 1;
            var v = Int() - 1;
            g[u].Add(v);
            g[v].Add(u);
        }
        (long, long) F(int v, int last)
        {
            var a = az[v];
            var r1 = 0L;
            var r2 = a;
            var r1p = 0L;
            var r1d = 0L;
            foreach (var u in g[v]) if (u != last)
            {
                var (n1, n2) = F(u, v);
                r1 = (r1 + n1 + n2) % Mod;
                r2 = (r2 + n2 * a) % Mod;
                r1p += n2;
                r1d = (r1d + n2 * n2) % Mod;
            }
            r1p %= Mod;
            r1p = r1p * r1p % Mod;
            var r1t = (r1p - r1d + Mod) % Mod * Half % Mod * a % Mod;
            r1 = (r1 + r1t) % Mod;;
            return (r1, r2);
        }
        var ans = F(0, -1);
        return (ans.Item1 + ans.Item2 + Mod - az.Sum() % Mod) % Mod;
    }

    public static void Main() => new AtCoder().Run();
    public void Run()
    {
        var res = Solve();
        if (res != null)
        {
            if (res is bool yes) res = yes ? "Yes" : "No";
            sw.WriteLine(res);
        }
        sw.Flush();
    }

    string[] input = Array.Empty<string>();
    int iter = 0;
    readonly StreamWriter sw = new(Console.OpenStandardOutput()) { AutoFlush = false };

    string String()
    {
        while (iter >= input.Length) (input, iter) = (Console.ReadLine()!.Split(' '), 0);
        return input[iter++];
    }
    T Input<T>() where T : IParsable<T> => T.Parse(String(), null);
    int Int() => Input<int>();
    void Out(object? x, string? separator = null)
    {
        separator ??= Environment.NewLine;
        if (x is System.Collections.IEnumerable obj and not string)
        {
            var firstLine = true;
            foreach (var item in obj)
            {
                if (!firstLine) sw.Write(separator);
                firstLine = false;
                sw.Write(item);
            }
        }
        else sw.Write(x);
        sw.WriteLine();
    }
}