#![allow(non_snake_case)]

use std::collections::{ HashSet };
use std::io::{ self, prelude::* };

macro_rules! pick {
    ($tokens:expr) => {
        $tokens.next().unwrap().parse().expect("parse error")
    }
}

fn main() {
    let mut s = String::new();
    io::stdin().read_to_string(&mut s).expect("i/o error");
    let mut tokens = s.split_whitespace();

    let N: usize = pick!(tokens);
    let M: usize = pick!(tokens);
    let mut A: Vec<u64> = Vec::with_capacity(N);
    let mut G: Vec<Vec<usize>> = vec![vec![]; N];

    for _ in 0..N {
        A.push(pick!(tokens));
    }
    for _ in 0..M {
        let mut i: usize = pick!(tokens); i -= 1;
        let mut j: usize = pick!(tokens); j -= 1;
        G[i].push(j);
        G[j].push(i);
    }

    for i in 0..N {
        let mut lts = HashSet::new();
        let mut gts = HashSet::new();
        for &j in &G[i] {
            if A[j] < A[i] {
                lts.insert(A[j]);
            }
            else if A[j] > A[i] {
                gts.insert(A[j]);
            }
        }

        if lts.len() >= 2 || gts.len() >= 2 {
            println!("YES");
            return;
        }
    }

    println!("NO");
}