#include <bits/stdc++.h>
using namespace std;
typedef int ll;
typedef pair<ll, ll> l_l;
typedef pair<int, int> i_i;
template<class T>
inline bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
inline bool chmin(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }
    return false;
}

const long long INF = 1e18;
//const ll mod = 1000000007;
ll N, M;
ll B[100500];
vector<ll> C;
ll L[105000], R[105000];
vector<ll> query[105000];
void merge(vector<ll> &a, vector<ll> b) {
    for(auto tmp : b) {
        a.push_back(tmp);
    }
}

void print(vector<ll> v) {
    cerr << "{";
    for(int i = 0; i < v.size(); i++) {
        if(i != 0) cerr << ", ";
        cerr << v[i];
    }
    cerr << "}" << endl;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> N >> M;
    for(int i = 1; i <= N; i++) cin >> B[i];
    C.resize(N + 1);
    for(int i = 0; i <= N; i++) {
        C[i] = B[i] + B[i+1];
    }
    N++;
    for(int i = 0; i < M; i++) {
        cin >> L[i] >> R[i];
        L[i]--;
        query[L[i]].push_back(R[i]);
    }
    //print(C);
    for(int i = 0; i < N; i++) {
        //cerr << "---" << i << "---" << endl;
        if(query[i].empty()) continue;
        sort(query[i].begin(), query[i].end());
        query[i].erase(unique(query[i].begin(), query[i].end()), query[i].end());
        //print(query[i]);
        ll r = query[i][0];
        if(r == i) {
            C[i] = 0;
        } else if((r - i) % 2 == 0) {
            ll delta = C[i];
            C[i] -= delta;
            C[r] += delta;
        } else {
            ll delta = C[i];
            C[i] -= delta;
            C[r] -= delta;
        }
        query[i].erase(query[i].begin());
        merge(query[r], query[i]);
    }
    //print(C);
    string ans = "YES";
    for(int i = 0; i < N; i++) {
        if(C[i] != 0) {
            ans = "NO";
        }
    }
    cout << ans << endl;
    return 0;
}