import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) {
        InputReader in = new InputReader(System.in);
        int n = in.nextInt();
        int[] arr = new int[n];
        int[] prefixSum = new int[n];
        int sum = 0;
        for (int i = 0; i < n; i++) {
            arr[i] = in.nextInt();
            sum += arr[i];
            prefixSum[i] = sum;
        }
        int j = n - 1;
        while (j >= 0 && prefixSum[j] == 0) j--;
        int index = 0;
        while (index < n && prefixSum[index] == 0) index++;
        if (index == j || j == -1) {
            System.out.println("NO");
            return;
        }

        System.out.println("YES");
        if (n >= 2) {
            System.out.println(2);
        } else {
            System.out.println(1);
        }
        System.out.println(new StringBuilder().append("1 ").append(j));
        if (n >= 2) {
            System.out.println(new StringBuilder().append(j + 1).append(' ').append(n));
        }

    }
}

class InputReader {
    BufferedReader reader;
    StringTokenizer tokenizer;

    public InputReader(InputStream stream) {
        reader = new BufferedReader(new InputStreamReader(stream));
        tokenizer = null;
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }

    public long nextLong() {
        return Long.parseLong(next());
    }

    public int nextInt() {
        return Integer.parseInt(next());
    }

}