package contest220325;
import java.io.*;
import java.util.*;
import java.util.function.Consumer;
import java.util.function.IntUnaryOperator;
import java.util.function.LongUnaryOperator;

public class F {
	InputStream is;
	FastWriter out;

	String INPUT = "";

	public void solve()
	{
		int n = ni();
		int[] a = na(n);
		int[] parity = new int[n+1];
		int[] ft = new int[n+5];
		for(int i = 0;i < n;i++){
			parity[a[i]] = sumFenwick(ft, a[i]) % 2;
			addFenwick(ft, a[i], 1);
		}

		Node[] nodes = new Node[n+1];
		Node root = null;
		for(int i = 0;i < n;i++){
			nodes[a[i]] = new Node(parity[a[i]], a[i]);
			root = merge(root, nodes[a[i]]);
		}

		Deque<String> route = new ArrayDeque<>();
		for(int i = n;i >= 1;i--){
			Node tar = nodes[i];
			int ind = index(tar);
			root = delete(root, ind);
			if(ind % 2 == 1){
				if(sum(root) == size(root)){
					out.println("No");
					return;
				}
				Node lazy = null;
				Node cur = root;
				while(cur != null){
					if(sum(cur.R) < size(cur.R)){
						cur = cur.R;
					}else if(cur.v == 0){
						lazy = cur;
						break;
					}else{
						cur = cur.L;
					}
				}

				assert lazy != null;
				if(index(lazy) % 2 != 0){
					out.println("No");
					return;
				}
				int pos = index(lazy);
				root = delete(root, pos);

				route.addFirst("" + lazy.id + " " + (pos+1));
				route.addFirst("" + i + " " + (ind));

				i--;
				while(i > lazy.id){
					ind = index(nodes[i]);
					root = delete(root, ind);
					route.addFirst("" + i + " " + (ind+1));
					i--;
				}
			}else{
				route.addFirst("" + i + " " + (ind+1));
			}
		}
		out.println("Yes");
		for(String r : route){
			out.println(r);
		}
	}


	public static Random gen = new Random();
	public static final int mod = 998244353;

	static public class Node
	{
		public long priority;
		public Node L, R, P;
		int id;

		public long v; // value
		public long sum;
		public int size;

		public Node(int v, int id)
		{
			this.v = v;
			this.id = id;
			priority = gen.nextLong();
			update();
		}

		public void update()
		{
			size = size(L) + size(R) + 1;
			sum = v + sum(L) + sum(R);
			// TODO
		}

		@Override
		public String toString() {
			return "Node{" +
					"v=" + v +
					", sum=" + sum +
					", size=" + size +
					'}';
		}
	}

	public static void propagate(Node x)
	{
		for(;x != null;x = x.P)x.update();
	}

	public static Node disconnect(Node a)
	{
		if(a == null)return null;
		a.L = a.R = a.P = null;
		a.update();
		return a;
	}

	public static int size(Node x){ return x == null ? 0 : x.size;}
	public static long sum(Node x){ return x == null ? 0 : x.sum;}

	public static void setParent(Node a, Node par)
	{
		if(a != null)a.P = par;
	}

	public static Node merge(Node a, Node b, Node... c)
	{
		Node x = merge(a, b);
		for(Node n : c)x = merge(x, n);
		return x;
	}

	public static Node merge(Node a, Node b)
	{
		if(b == null)return a;
		if(a == null)return b;
		if(a.priority > b.priority){
			setParent(a.R, null);
			setParent(b, null);
			a.R = merge(a.R, b);
			setParent(a.R, a);
			a.update();
			return a;
		}else{
			setParent(a, null);
			setParent(b.L, null);
			b.L = merge(a, b.L);
			setParent(b.L, b);
			b.update();
			return b;
		}
	}

	public static Node[] split(Node x)
	{
		if(x == null)return new Node[]{null, null};
		if(x.L != null)x.L.P = null;
		Node[] sp = new Node[]{x.L, x};
		x.L = null;
		x.update();
		while(x.P != null){
			Node p = x.P;
			x.P = null;
			if(x == p.L){
				p.L = sp[1];
				if(sp[1] != null)sp[1].P = p;
				sp[1] = p;
			}else{
				p.R = sp[0];
				if(sp[0] != null)sp[0].P = p;
				sp[0] = p;
			}
			p.update();
			x = p;
		}
		return sp;
	}

	// [0,K),[K,N)
	public static Node[] split(Node a, int K)
	{
		if(a == null)return new Node[]{null, null};
		if(K <= size(a.L)){
			setParent(a.L, null);
			Node[] s = split(a.L, K);
			a.L = s[1];
			setParent(a.L, a);
			a.update();
			s[1] = a;
			return s;
		}else{
			setParent(a.R, null);
			Node[] s = split(a.R, K- size(a.L)-1);
			a.R = s[0];
			setParent(a.R, a);
			a.update();
			s[0] = a;
			return s;
		}
	}

	public static Node insertb(Node root, Node x)
	{
		assert x != null;
		int ind = lowerBound(root, x.v);
		return insert(root, ind, x);
	}

	public static Node insert(Node root, int K, Node x)
	{
		assert K >= 0;
		assert K <= size(root);
		assert size(x) == 1;
		Node[] sp = split(root, K);
		return merge(sp[0], x, sp[1]);
	}

	public static Node delete(Node root, int K)
	{
		assert K >= 0;
		assert K < size(root);
		Node[] lm_r = split(root, K+1);
		Node[] l_m = split(lm_r[0], K);
		return merge(l_m[0], lm_r[1]);
	}

	public static Node get(Node a, int K)
	{
		assert K >= 0;
		assert K < size(a);
		while(a != null){
			if(K < size(a.L)){
				a = a.L;
			}else if(K == size(a.L)){
				break;
			}else{
				K = K - size(a.L)-1;
				a = a.R;
			}
		}
		return a;
	}

	public static int index(Node a)
	{
		assert a != null;
		int ind = size(a.L);
		while(a != null){
			Node par = a.P;
			if(par != null && par.R == a){
				ind += size(par.L) + 1;
			}
			a = par;
		}
		return ind;
	}

	public static Node mergeTechnically(Node x, Node y)
	{
		if(size(x) > size(y)){
			Node d = x; x = y; y = d;
		}
		// |x|<=|y|
		for(Node cur : nodesdfs(x))y = insertb(y, disconnect(cur));
		return y;
	}

	public static int lowerBound(Node a, long q)
	{
		int lcount = 0;
		while(a != null){
			if(a.v >= q){
				a = a.L;
			}else{
				lcount += size(a.L) + 1;
				a = a.R;
			}
		}
		return lcount;
	}

	public static Node next(Node x)
	{
		if(x == null)return null;
		if(x.R != null){
			x = x.R;
			while(x.L != null)x = x.L;
			return x;
		}else{
			while(true){
				Node p = x.P;
				if(p == null)return null;
				if(p.L == x)return p;
				x = p;
			}
		}
	}

	public static Node prev(Node x)
	{
		if(x == null)return null;
		if(x.L != null){
			x = x.L;
			while(x.R != null)x = x.R;
			return x;
		}else{
			while(true){
				Node p = x.P;
				if(p == null)return null;
				if(p.R == x)return p;
				x = p;
			}
		}
	}

	public static Node build(Node[] a){return build(a, 0, a.length);}
	public static Node build(Node[] a, int l, int r)
	{
		if(l >= r)return null;

		int h = l+r>>1;
		Node root = a[h];

		Node L = build(a, l, h);
		root.L = L;
		if(L != null)L.P = root;

		Node R = build(a, h+1, r);
		root.R = R;
		if(R != null)R.P = root;

		root.update();
		return root;
	}


	public static Node[] nodes(Node a) { return nodes(a, new Node[size(a)], 0, size(a)); }
	public static Node[] nodes(Node a, Node[] ns, int L, int R)
	{
		if(a == null)return ns;
		nodes(a.L, ns, L, L+ size(a.L));
		ns[L+ size(a.L)] = a;
		nodes(a.R, ns, R- size(a.R), R);
		return ns;
	}

	// faster than nodes but inconsistent
	public static Node[] nodesdfs(Node a) { return nodesdfs(a, new Node[a.size], new int[]{0}); }
	public static Node[] nodesdfs(Node a, Node[] ns, int[] pos)
	{
		if(a == null)return ns;
		ns[pos[0]++] = a;
		nodesdfs(a.L, ns, pos);
		nodesdfs(a.R, ns, pos);
		return ns;
	}

	public static String toString(Node a, String indent)
	{
		if(a == null)return "";
		return toString(a.L, indent + "  ") +
				indent + a + "\n" +
				toString(a.R, indent + "  ");
	}

	public static Node operate(Node root, int l, int r, Consumer<Node> o)
	{
		Node[] lm_r = split(root, r);
		Node[] l_m = split(lm_r[0], l);
		o.accept(l_m[1]);
		l_m[1].update();
		return merge(l_m[0], l_m[1], lm_r[1]);
	}



	public static int sumFenwick(int[] ft, int i)
	{
		int sum = 0;
		for(i++;i > 0;i -= i&-i)sum += ft[i];
		return sum;
	}

	public static void addFenwick(int[] ft, int i, int v)
	{
		if(v == 0 || i < 0)return;
		int n = ft.length;
		for(i++;i < n;i += i&-i)ft[i] += v;
	}

	public static int firstGEFenwick(int[] ft, int v)
	{
		int i = 0, n = ft.length;
		for(int b = Integer.highestOneBit(n);b != 0;b >>= 1){
			if((i|b) < n && ft[i|b] < v){
				i |= b;
				v -= ft[i];
			}
		}
		return i;
	}


	public static void main(String[] args) {
		new F().run();
	}

	public void run()
	{
		long S = System.currentTimeMillis();
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new FastWriter(System.out);

		solve();
		out.flush();
		long G = System.currentTimeMillis();
		tr(G-S+"ms");
		//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
		//			@Override
		//			public void run() {
		//				long s = System.currentTimeMillis();
		//				solve();
		//				out.flush();
		//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
		//			}
		//		};
		//		t.start();
		//		t.join();
	}

	private boolean eof()
	{
		if(lenbuf == -1)return true;
		int lptr = ptrbuf;
		while(lptr < lenbuf)if(!isSpaceChar(inbuf[lptr++]))return false;

		try {
			is.mark(1000);
			while(true){
				int b = is.read();
				if(b == -1){
					is.reset();
					return true;
				}else if(!isSpaceChar(b)){
					is.reset();
					return false;
				}
			}
		} catch (IOException e) {
			return true;
		}
	}

	private final byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;

	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}

	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	//	private boolean isSpaceChar(int c) { return !(c >= 32 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }

	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }

	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}

	private char[][] nm(int n, int m)
	{
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}

	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}

	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}

	private int ni()
	{
		int num = 0, b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}

		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}

	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}

		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}

	public static class FastWriter
	{
		private static final int BUF_SIZE = 1<<13;
		private final byte[] buf = new byte[BUF_SIZE];
		private final OutputStream out;
		private int ptr = 0;

		private FastWriter(){out = null;}

		public FastWriter(OutputStream os)
		{
			this.out = os;
		}

		public FastWriter(String path)
		{
			try {
				this.out = new FileOutputStream(path);
			} catch (FileNotFoundException e) {
				throw new RuntimeException("FastWriter");
			}
		}

		public FastWriter write(byte b)
		{
			buf[ptr++] = b;
			if(ptr == BUF_SIZE)innerflush();
			return this;
		}

		public FastWriter write(char c)
		{
			return write((byte)c);
		}

		public FastWriter write(char[] s)
		{
			for(char c : s){
				buf[ptr++] = (byte)c;
				if(ptr == BUF_SIZE)innerflush();
			}
			return this;
		}

		public FastWriter write(String s)
		{
			s.chars().forEach(c -> {
				buf[ptr++] = (byte)c;
				if(ptr == BUF_SIZE)innerflush();
			});
			return this;
		}

		private static int countDigits(int l) {
			if (l >= 1000000000) return 10;
			if (l >= 100000000) return 9;
			if (l >= 10000000) return 8;
			if (l >= 1000000) return 7;
			if (l >= 100000) return 6;
			if (l >= 10000) return 5;
			if (l >= 1000) return 4;
			if (l >= 100) return 3;
			if (l >= 10) return 2;
			return 1;
		}

		public FastWriter write(int x)
		{
			if(x == Integer.MIN_VALUE){
				return write((long)x);
			}
			if(ptr + 12 >= BUF_SIZE)innerflush();
			if(x < 0){
				write((byte)'-');
				x = -x;
			}
			int d = countDigits(x);
			for(int i = ptr + d - 1;i >= ptr;i--){
				buf[i] = (byte)('0'+x%10);
				x /= 10;
			}
			ptr += d;
			return this;
		}

		private static int countDigits(long l) {
			if (l >= 1000000000000000000L) return 19;
			if (l >= 100000000000000000L) return 18;
			if (l >= 10000000000000000L) return 17;
			if (l >= 1000000000000000L) return 16;
			if (l >= 100000000000000L) return 15;
			if (l >= 10000000000000L) return 14;
			if (l >= 1000000000000L) return 13;
			if (l >= 100000000000L) return 12;
			if (l >= 10000000000L) return 11;
			if (l >= 1000000000L) return 10;
			if (l >= 100000000L) return 9;
			if (l >= 10000000L) return 8;
			if (l >= 1000000L) return 7;
			if (l >= 100000L) return 6;
			if (l >= 10000L) return 5;
			if (l >= 1000L) return 4;
			if (l >= 100L) return 3;
			if (l >= 10L) return 2;
			return 1;
		}

		public FastWriter write(long x)
		{
			if(x == Long.MIN_VALUE){
				return write("" + x);
			}
			if(ptr + 21 >= BUF_SIZE)innerflush();
			if(x < 0){
				write((byte)'-');
				x = -x;
			}
			int d = countDigits(x);
			for(int i = ptr + d - 1;i >= ptr;i--){
				buf[i] = (byte)('0'+x%10);
				x /= 10;
			}
			ptr += d;
			return this;
		}

		public FastWriter write(double x, int precision)
		{
			if(x < 0){
				write('-');
				x = -x;
			}
			x += Math.pow(10, -precision)/2;
			//		if(x < 0){ x = 0; }
			write((long)x).write(".");
			x -= (long)x;
			for(int i = 0;i < precision;i++){
				x *= 10;
				write((char)('0'+(int)x));
				x -= (int)x;
			}
			return this;
		}

		public FastWriter writeln(char c){ return write(c).writeln(); }
		public FastWriter writeln(int x){ return write(x).writeln(); }
		public FastWriter writeln(long x){ return write(x).writeln(); }
		public FastWriter writeln(double x, int precision){ return write(x, precision).writeln(); }

		public FastWriter write(int... xs)
		{
			boolean first = true;
			for(int x : xs) {
				if (!first) write(' ');
				first = false;
				write(x);
			}
			return this;
		}

		public FastWriter write(long... xs)
		{
			boolean first = true;
			for(long x : xs) {
				if (!first) write(' ');
				first = false;
				write(x);
			}
			return this;
		}

		public FastWriter write(IntUnaryOperator f, int... xs)
		{
			boolean first = true;
			for(int x : xs) {
				if (!first) write(' ');
				first = false;
				write(f.applyAsInt(x));
			}
			return this;
		}

		public FastWriter write(LongUnaryOperator f, long... xs)
		{
			boolean first = true;
			for(long x : xs) {
				if (!first) write(' ');
				first = false;
				write(f.applyAsLong(x));
			}
			return this;
		}

		public FastWriter writeln()
		{
			return write((byte)'\n');
		}

		public FastWriter writeln(int... xs) { return write(xs).writeln(); }
		public FastWriter writeln(long... xs) { return write(xs).writeln(); }
		public FastWriter writeln(IntUnaryOperator f, int... xs) { return write(f, xs).writeln(); }
		public FastWriter writeln(LongUnaryOperator f, long... xs) { return write(f, xs).writeln(); }
		public FastWriter writeln(char[] line) { return write(line).writeln(); }
		public FastWriter writeln(char[]... map) { for(char[] line : map)write(line).writeln();return this; }
		public FastWriter writeln(String s) { return write(s).writeln(); }

		private void innerflush()
		{
			try {
				out.write(buf, 0, ptr);
				ptr = 0;
			} catch (IOException e) {
				throw new RuntimeException("innerflush");
			}
		}

		public void flush()
		{
			innerflush();
			try {
				out.flush();
			} catch (IOException e) {
				throw new RuntimeException("flush");
			}
		}

		public FastWriter print(byte b) { return write(b); }
		public FastWriter print(char c) { return write(c); }
		public FastWriter print(char[] s) { return write(s); }
		public FastWriter print(String s) { return write(s); }
		public FastWriter print(int x) { return write(x); }
		public FastWriter print(long x) { return write(x); }
		public FastWriter print(double x, int precision) { return write(x, precision); }
		public FastWriter println(char c){ return writeln(c); }
		public FastWriter println(int x){ return writeln(x); }
		public FastWriter println(long x){ return writeln(x); }
		public FastWriter println(double x, int precision){ return writeln(x, precision); }
		public FastWriter print(int... xs) { return write(xs); }
		public FastWriter print(long... xs) { return write(xs); }
		public FastWriter print(IntUnaryOperator f, int... xs) { return write(f, xs); }
		public FastWriter print(LongUnaryOperator f, long... xs) { return write(f, xs); }
		public FastWriter println(int... xs) { return writeln(xs); }
		public FastWriter println(long... xs) { return writeln(xs); }
		public FastWriter println(IntUnaryOperator f, int... xs) { return writeln(f, xs); }
		public FastWriter println(LongUnaryOperator f, long... xs) { return writeln(f, xs); }
		public FastWriter println(char[] line) { return writeln(line); }
		public FastWriter println(char[]... map) { return writeln(map); }
		public FastWriter println(String s) { return writeln(s); }
		public FastWriter println() { return writeln(); }
	}

	public static void trnz(int... o)
	{
		for(int i = 0;i < o.length;i++)if(o[i] != 0)System.out.print(i+":"+o[i]+" ");
		System.out.println();
	}

	// print ids which are 1
	public static void trt(long... o)
	{
		Queue<Integer> stands = new ArrayDeque<>();
		for(int i = 0;i < o.length;i++){
			for(long x = o[i];x != 0;x &= x-1)stands.add(i<<6|Long.numberOfTrailingZeros(x));
		}
		System.out.println(stands);
	}

	public static void tf(boolean... r)
	{
		for(boolean x : r)System.out.print(x?'#':'.');
		System.out.println();
	}

	public static void tf(boolean[]... b)
	{
		for(boolean[] r : b) {
			for(boolean x : r)System.out.print(x?'#':'.');
			System.out.println();
		}
		System.out.println();
	}

	public void tf(long[]... b)
	{
		if(INPUT.length() != 0) {
			for (long[] r : b) {
				for (long x : r) {
					for (int i = 0; i < 64; i++) {
						System.out.print(x << ~i < 0 ? '#' : '.');
					}
				}
				System.out.println();
			}
			System.out.println();
		}
	}

	public void tf(long... b)
	{
		if(INPUT.length() != 0) {
			for (long x : b) {
				for (int i = 0; i < 64; i++) {
					System.out.print(x << ~i < 0 ? '#' : '.');
				}
			}
			System.out.println();
		}
	}

	private void tr(Object... o) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); }
}