import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Random;
import java.util.TreeMap;
 
 
public class Main {
	
	public static void main(String[] args) throws IOException {
		Main m = new Main();
		//*
		m.input();
		m.solve();
		m.output();
		/*/
		m.debug();
		//*/
	}
	
	public void debug() {
	}
	
	/*
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	/*/
	InputUtil in = new InputUtil();
	PrintWriter out = new PrintWriter(System.out);
	//*/
	int N = 0;
	int[] A = null;
	TreeMap<Integer,LinkedList<Integer>> numMap = new TreeMap<>();
	long ans = 0;
	LinkedList<Pair> ope = new LinkedList<>();
	int maxval = Integer.MIN_VALUE;
	int maxidx = -1;
	int minval = Integer.MAX_VALUE;
	int minidx = -1;
	
	
	public void input() throws IOException {
		/*
		S = br.readLine();
		/*/
		N = in.nextInt();
		A = new int[N];
		for(int i=0; i<N; i++){
			A[i] = in.nextInt();
			if(maxval<A[i]){
				maxval=A[i];
				maxidx=i;
			}
			if(minval>A[i]){
				minval=A[i];
				minidx=i;
			}
		}
		//*/
	}
	

 
	public void solve() throws IOException {
		boolean plus = (maxval > 0 && (minval > 0 || Math.abs(maxval) > Math.abs(minval)));
		if(plus){
			for(int i=0; i<N; i++){
				int preIdx = i-1;
				if(preIdx<0){
					preIdx = maxidx;
				}
				if(A[i]<0){
					doOperation(preIdx,i);
				}
				doOperation(preIdx,i);
			}
		}else{
			for(int i=N-1; i>=0; i--){
				int preIdx = i+1;
				if(preIdx>N-1){
					preIdx = minidx;
				}
				
				if(A[i]>0){
					doOperation(preIdx,i);
				}
				doOperation(preIdx,i);
			}
		}
	}
	
	private void doOperation(int x, int y) {
		ope.add(new Pair(x+1,y+1));
	}
	
	public void output() {
		out.println(ope.size());
		for(Pair xy : ope)
			out.println(xy.x+" "+xy.y);
		out.flush();
	}
}

class Pair  {
	int x;
	int y;
	public Pair(int x,int y) {
		this.x=x;
		this.y=y;
	}
	
}

 
//*
class InputUtil {
	//Static Fields
	private static final int BUFSIZ = 100000;
	
	//Fields
	protected InputStream in;
	private byte[] buf = null;
	private int ptr = 0;
	private int max = -1;
	private DataInputStream dis = null;
	//Constructors
	public InputUtil() {this(System.in,BUFSIZ);}
	public InputUtil(InputStream in, int bufsiz) {
		initBuf(bufsiz);
		initIn(in);
	}
	
	//Methods
	//Initializer
	protected void initIn(InputStream in) {dis = new DataInputStream(this.in = in);}
	protected void initBuf(int bufsiz) {buf = new byte[bufsiz];}
	
	//buffer operation
	private void next() throws IOException {ptr++; readBuf();}
	private void readBuf() throws IOException {
		if(ptr >= max && dis.available()>0) {
			if(max>0) Arrays.fill(buf,0,max,(byte)0);
			max = dis.read(buf);
			ptr = 0;
		}
	}
	
	//Number Input Reader/Parser
	private boolean isNum(byte b) {return '0' <= b && b <= '9'; }
	private boolean isMinus(byte b) {return b=='-'; }
 
	private int _nextInt() throws IOException {
		int sign = 1;
		int res = 0;
		byte c;
		while (!isNum(c=buf[ptr]) && !isMinus(c)) 
			next();
		if (isMinus(buf[ptr])) {
			sign = -1;
			next();
		}
		while (isNum(c=buf[ptr])) {
			res *= 10;
			res += c - '0' ;
			next();
		}
		next();
		return sign * res;
	}
	
	public int nextInt() throws IOException {
		readBuf();
		return _nextInt();
	}
 
	public int[] nextInt(int[] result) throws IOException {
		readBuf();
		for(int i=0; i<result.length; i++) {
			result[i] = _nextInt();
		}
		return result;
	}
	
	//Close 
	public void close() throws IOException {
		if(!this.in.equals(System.in)) 
			this.in.close();
	}
}
//*/

Measured memory_bytes: 23380