#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1e9 + 7;
const long long SIZE = 100000;
const int INF = 0x3f3f3f3f;
const long long ll_INF = 0x3f3f3f3f3f3f3f3f;
const long double PI = acos(-1);
const long long MAXN = numeric_limits<long long>::max();
const long long MAX = 2000000;
void disp(vector<long long> v) {
  for (auto u : v) cout << u << " ";
  cout << '\n';
}
void solve() {
  long long n, sum = 0;
  cin >> n;
  vector<long long> a(n);
  for (long long i = 0; i < n; i++) cin >> a[i];
  for (long long i = 0; i < n; i++) {
    sum += a[i];
  }
  if (sum == 0) {
    for (long long i = 0; i < n; i++) {
      if (a[i] != 0) {
        cout << "YES\n";
        cout << 2 << '\n';
        cout << 1 << " " << i + 1 << '\n';
        cout << i + 2 << " " << n << '\n';
        return;
      }
    }
    cout << "NO\n";
  } else {
    cout << "YES\n";
    cout << 1 << '\n';
    cout << 1 << " " << n << '\n';
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  solve();
  return 0;
}
