using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, m) = (c[0], c[1]);
        var _b = NList;
        var map = NArr(m);
        WriteLine(Addition(n, m, _b, map) ? "YES" : "NO");
    }
    static bool Addition(int n, int m, int[] _b, int[][] map)
    {
        var b = new long[n];
        for (var i = 0; i < n; ++i) b[i] = _b[i] * (i % 2 == 1 ? -1 : 1);

        var a = new long[n];
        var slist = new HashSet<int>[n];
        for (var i = 0; i < n; ++i) slist[i] = new HashSet<int>();
        for (var i = 0; i < m; ++i) slist[map[i][0] - 1].Add(map[i][1] - 1);
        for (var i = 0; i < n; ++i)
        {
            if (i > 0) a[i] += a[i - 1];
            var list = new List<int>(slist[i]);
            if (list.Count > 0)
            {
                list.Sort();
                var diff = b[i] - a[i];
                a[i] += diff;
                if (list[0] + 1 < n) a[list[0] + 1] -= diff;
                for (var j = 1; j < list.Count; ++j) slist[list[j - 1] + 1].Add(list[j]);
            }
        }
        var flg = true;
        for (var i = 0; i < n; ++i) if (a[i] != b[i]) flg = false;
        return flg;
    }
}