Problem:
Score : 300 points

Problem Statement

There are N observatories in AtCoder Hill, called Obs. 1, Obs. 2, ..., Obs. N. The elevation of Obs. i is H_i.
There are also M roads, each connecting two different observatories. Road j connects Obs. A_j and Obs. B_j.

Obs. i is said to be good when its elevation is higher than those of all observatories that can be reached from Obs. i using just one road.
Note that Obs. i is also good when no observatory can be reached from Obs. i using just one road.

How many good observatories are there?

Constraints

2 \leq N \leq 10^5

1 \leq M \leq 10^5

1 \leq H_i \leq 10^9

1 \leq A_i,B_i \leq N

A_i \neq B_i

Multiple roads may connect the same pair of observatories.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N M
H_1 H_2 ... H_N
A_1 B_1
A_2 B_2
:
A_M B_M

Output

Print the number of good observatories.

Sample Input 1

4 3
1 2 3 4
1 3
2 3
2 4

Sample Output 1

2

From Obs. 1, you can reach Obs. 3 using just one road. The elevation of Obs. 1 is not higher than that of Obs. 3, so Obs. 1 is not good.

From Obs. 2, you can reach Obs. 3 and 4 using just one road. The elevation of Obs. 2 is not higher than that of Obs. 3, so Obs. 2 is not good.

From Obs. 3, you can reach Obs. 1 and 2 using just one road. The elevation of Obs. 3 is higher than those of Obs. 1 and 2, so Obs. 3 is good.

From Obs. 4, you can reach Obs. 2 using just one road. The elevation of Obs. 4 is higher than that of Obs. 2, so Obs. 4 is good.

Thus, the good observatories are Obs. 3 and 4, so there are two good observatories.

Sample Input 2

6 5
8 6 9 1 2 1
1 3
4 2
4 3
4 6
4 6

Sample Output 2

3

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Linq;
using System.Numerics;
using System.Collections.Generic;

namespace ForAtcoder
{
    class Program
    {
        static void Main(string[] args)
        {
            long[] nm = Console.ReadLine().Split(' ').Select(i => long.Parse(i)).ToArray();
            var n = nm[0];
            var m = nm[1];
            long[] h = Console.ReadLine().Split(' ').Select(i => long.Parse(i)).ToArray();
            long[,] abs = new long[2, m];
            for (var i = 0; i < m; i++)
            {
                long[] ab = Console.ReadLine().Split(' ').Select(j => long.Parse(j)).ToArray();
                abs[0, i] = ab[0];
                abs[1, i] = ab[1];
            }

            var bad = new HashSet<long>();

            for (var i = 0; i < m; i++)
            {
                if (h[abs[0, i] - 1] >= h[abs[1, i] - 1]) bad.Add(abs[1, i]);
                if (h[abs[0, i] - 1] <= h[abs[1, i] - 1]) bad.Add(abs[0, i]);
            }

            Console.WriteLine(n - bad.Count); 

        }
    }
}