#include <bits/stdc++.h>
using namespace std;
int main() {
  long long t;
  cin >> t;
  long long arr[t], sum = 0;
  for (int i = 0; i < t; ++i) {
    cin >> arr[i];
    sum += arr[i];
  }
  if (sum != 0) {
    cout << "YES" << endl;
    cout << 1 << endl;
    cout << 1 << " " << t << endl;
    return 0;
  }
  if (t == 1) {
    if (arr[0] != 0) {
      cout << "YES" << endl;
      cout << 1 << endl;
      cout << 1 << endl;
    } else
      cout << "NO" << endl;
  } else {
    for (int i = 0; i < t; i++) {
      sum += arr[i];
      if (sum != 0) {
        cout << "YES" << endl;
        cout << 2 << endl;
        cout << 1 << " " << i + 1 << endl;
        cout << i + 2 << " " << t << endl;
        return 0;
      }
    }
    cout << "NO" << endl;
  }
  return 0;
}
