#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second

const ll MOD = 1000000007;
const ll MOD2 = 998244353;
const ll INF = 1LL << 60;
const ll MAX_N = 2e5;

int main(){
    ll n, m;
    cin >> n >> m;

    vector<ll> h(n);
    rep(i, n) cin >> h[i];

    vector<vector<ll>> G(n);
    rep(i, m){
        ll u, v;
        cin >> u >> v;
        u--; v--;
        G[u].pb(v);
        G[v].pb(u);
    }

    // cherry
    vector<vector<ll>> cost1(n, vector<ll>(2, -INF));
    vector<vector<bool>> check1(n, vector<bool>(2, false));
    cost1[0][0] = 0;
    priority_queue<tuple<ll, ll, ll>> PQ1;
    PQ1.push({0, 0, 0});
    while(!PQ1.empty()){
        ll u = get<1>(PQ1.top());
        ll isUp = get<2>(PQ1.top());
        PQ1.pop();
        if(check1[u][isUp]) continue;
        check1[u][isUp] = true;

        for(ll v : G[u]){
            if(v < u) continue;
            if(isUp == 0){
                if(h[u] < h[v]){
                    if(cost1[v][1] < cost1[u][0]+(h[v]-h[u])){
                        cost1[v][1] = cost1[u][0]+(h[v]-h[u]);
                        PQ1.push({cost1[v][1], v, 1});
                    }
                }else{
                    if(cost1[v][0] < cost1[u][0]){
                        cost1[v][0] = cost1[u][0];
                        PQ1.push({cost1[v][0], v, 0});
                    }
                }
            }else{
                if(h[u] > h[v]){
                    if(cost1[v][0] < cost1[u][1]){
                        cost1[v][0] = cost1[u][1];
                        PQ1.push({cost1[v][0], v, 0});
                    }
                }
            }
        }
    }

    // zerukoba
    vector<vector<ll>> cost2(n, vector<ll>(2, -INF));
    vector<vector<bool>> check2(n, vector<bool>(2, false));
    cost2[n-1][0] = 0;
    priority_queue<tuple<ll, ll, ll>> PQ2;
    PQ2.push({0, n-1, 0});
    while(!PQ2.empty()){
        ll u = get<1>(PQ2.top());
        ll isUp = get<2>(PQ2.top());
        PQ2.pop();
        if(check2[u][isUp]) continue;
        check2[u][isUp] = true;

        for(ll v : G[u]){
            if(u < v) continue;
            if(isUp == 0){
                if(h[u] < h[v]){
                    if(cost2[v][1] < cost2[u][0]+(h[v]-h[u])){
                        cost2[v][1] = cost2[u][0]+(h[v]-h[u]);
                        PQ2.push({cost2[v][1], v, 1});
                    }
                }else{
                    if(cost2[v][0] < cost2[u][0]){
                        cost2[v][0] = cost2[u][0];
                        PQ2.push({cost2[v][0], v, 0});
                    }
                }
            }else{
                if(h[u] > h[v]){
                    if(cost2[v][0] < cost2[u][1]){
                        cost2[v][0] = cost2[u][1];
                        PQ2.push({cost2[v][0], v, 0});
                    }
                }
            }
        }
    }

    ll che = max(cost1[n-1][0], cost1[n-1][1]);
    ll zer = max(cost2[0][0], cost2[0][1]);

    if(che == -INF) cout << -1 << endl;
    else cout << che << endl;

    if(zer == -INF) cout << -1 << endl;
    else cout << zer << endl;
}