#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n, m; cin>>n>>m;
    vector<int> a(n);
    for(auto& e: a) cin>>e;

    vector<pair<int, int>> edges;
    while (m--) {
        int u, v; cin>>u>>v;
        edges.emplace_back(--u, --v);
        edges.emplace_back(v, u);
    }

    auto is_kadomatsu=[&](int i, int j, int k)
    {
        return (a[i]<a[j] and a[j]>a[k] or a[i]>a[j] and a[j]<a[k]) and a[i]!=a[k];
    };

    for(auto& [u, v]: edges) {
        for(auto& [x, y]: edges) {
            if (v==x and is_kadomatsu(u, v, y)) return cout<<"YES"<<endl, 0;
        }
    }
    cout<<"NO"<<endl;
}