Problem: Pavel is going to make a game of his dream. However, he knows that he can't make it on his own so he founded a development company and hired n workers of staff. Now he wants to pick n workers from the staff who will be directly responsible for developing a game.

Each worker has a certain skill level vi. Besides, each worker doesn't want to work with the one whose skill is very different. In other words, the i-th worker won't work with those whose skill is less than li, and with those whose skill is more than ri.

Pavel understands that the game of his dream isn't too hard to develop, so the worker with any skill will be equally useful. That's why he wants to pick a team of the maximum possible size. Help him pick such team.

Input

The first line contains a single integer n (1 ≤ n ≤ 105) — the number of workers Pavel hired.

Each of the following n lines contains three space-separated integers li, vi, ri (1 ≤ li ≤ vi ≤ ri ≤ 3·105) — the minimum skill value of the workers that the i-th worker can work with, the i-th worker's skill and the maximum skill value of the workers that the i-th worker can work with.

Output

In the first line print a single integer m — the number of workers Pavel must pick for developing the game.

In the next line print m space-separated integers — the numbers of the workers in any order.

If there are multiple optimal solutions, print any of them.

Examples

Input

4
2 8 9
1 4 7
3 6 8
5 8 10


Output

3
1 3 4


Input

6
3 5 16
1 6 11
4 8 12
7 9 16
2 10 14
8 13 15


Output

4
1 2 3 5

Solution (in JAVA):

Solution:

import java.io.*;
import java.math.*;
import java.util.*;


import static java.util.Arrays.*;

public class D {
	private static final int mod = (int)1e9+7;

	final Random random = new Random(0);
	final IOFast io = new IOFast();
	
	public void run() throws IOException {
		int n = io.nextInt();
		final int[][] xs = io.nextIntArray2DWithIndex(n, 3);
		int[][] ys = new int[n*2][2];
		
		for(int i = 0, j = 0; i < n; i++) {
			for(int k = 0; k < xs[i].length; k++) xs[i][k]--;
			ys[j][0] = i;
			ys[j++][1] = xs[i][0];
			
			ys[j][0] = i + n;
			ys[j++][1] = xs[i][1];
		}
		
		arrayIntSort(ys, 1, 0);
		
		final int MAX = 3*100000;
		SplayTreeIndex root = new SplayTreeIndex();
		for(int i = 0; i < MAX; i++) {
			root.insert(0, 0);
		}

		int ans = 0;
		int ansIdx = 0;
		int ansIdx2 = 0;
		for(int i = 0; i < ys.length; i++) {
			int idx = ys[i][0] % n;
			if(ys[i][0] < n) {
				root.add(xs[idx][1], xs[idx][2], 1);
//				io.out.println("add: " + xs[idx][1] + " " + xs[idx][2] + " " + root.max(0, MAX - 1));
				if(ans < root.max(0, MAX - 1)) {
					ans = root.max(0, MAX - 1);
					ansIdx = i;
					ansIdx2 = idx;
				}
			}
			else {
				root.add(xs[idx][1], xs[idx][2], -1);
//				io.out.println("del: " + xs[idx][1] + " " + xs[idx][2]);
			}
		}
		
		for(int i = 0; i < ansIdx; i++) {
			int idx = ys[i][0] % n;
			if(ys[i][0] < n) {
				root.add(xs[idx][1], xs[idx][2], 1);
//				io.out.println("add: " + xs[idx][1] + " " + xs[idx][2] + " " + root.max(0, MAX - 1));
			}
			else {
				root.add(xs[idx][1], xs[idx][2], -1);
//				io.out.println("del: " + xs[idx][1] + " " + xs[idx][2]);
			}
		}
		
		int low = xs[ansIdx2][1] - 1;
		int high = xs[ansIdx2][2];
		while(high - low > 1) {
			int mid = (low + high) / 2;
			if(root.max(xs[ansIdx2][1], mid) == ans - 1) { high = mid; }
			else { low = mid; }
		}
		
//		System.err.println(high + " " + xs[ansIdx2][0]);
//		high = 7;
		io.out.println(ans);
		for(int i = 0; i <= ansIdx; i++) {
			int idx = ys[i][0] % n;
			
			if(xs[idx][1] >= xs[ansIdx2][0] && xs[idx][2] >= high && xs[idx][1] <= high) {
				io.out.print((idx+1) + " ");
			}
		}
		io.out.println();
	}
	
	static
	class StarrySkyTree {
		final int n;
		final int[] seg;
		
		public StarrySkyTree(final int n) {
			this.n = Integer.highestOneBit(n) << 1;
			seg = new int[1<<this.n];
		}
		
		int restore(int k) {
			k += n - 1;
			int ret = seg[k];
			while(k > 0) {
				k = (k - 1) / 2;
				ret += seg[k];
			}
			return ret;
		}
		
		int max() { return seg[0]; }
		
		// [l, r)
		void add(int l, int r, int v) { add(0, 0, n, l, r, v); }
		void add(int k, int a, int b, int l, int r, int v) {
			if(r <= a || l >= b) { return; }
			
			if(a <= l && r <= b) { seg[k] += v; return; }
			
			final int c = (a + b) / 2;
			final int kl = 2*k+1;
			final int kr = 2*k+2;
			add(kl, a, c, l, r, v);
			add(kr, c, b, l, r, v);
			final int val = Math.max(seg[kl], seg[kr]);
			seg[kl] -= val;
			seg[kr] -= val;
			seg[k] += val;
		}
	}
	
	
	static
public
class SplayTreeIndex {
	Node root;

	static int getCount(Node n) { return n == null ? 0 : n.count; }
	static Node getLeft(Node n) { return n == null ? null : n.getLeft(); }
	static Node getRight(Node n) { return n == null ? null : n.getRight(); }

	// insert index value
	void insert(int index, int value) {
		insert(index, new Node(value, null));
	}
	void insert(int index, Node insertNode) {
		if(root == null) { root = insertNode; return; }
		final int n = getCount(root);
		if(n < index) throw new RuntimeException();
		final Node add = insertNode;
		if(n == index) {
			Node node = find(n - 1);
			Node.linkRight(add, node);
		}
		else {
			final Node node = find(index);
			final Node nl = Node.cut(node.getLeft());
			Node.linkLeft(nl, add);
			Node.linkRight(node, add);
		}
		root = add.splay();
	}

	// index subtree node
	Node find(Node node, int index) {
		while(node != null) {
			node.pushDown();
			if(getCount(node.getLeft()) > index) { node = node.getLeft(); }
			else if(getCount(node.getLeft()) == index) { return root = node.splay(); }
			else { index -= getCount(node.getLeft()) + 1; node = node.getRight(); }
		}
		return null;
	}

	Node find(int index) {
		return find(root, index);
	}

	// remove index
	void remove(final int index) {
		if(index < 0 || getCount(root) <= index) {
			throw new RuntimeException();
		}

		final Node node = find(index);
		final Node nl = Node.cut(node.getLeft());
		final Node nr = Node.cut(node.getRight());

		root = Node.merge(nl, nr);
	}

	final Node[] sep = new Node[3];

	// separate [0,l),[l,r],(r,..)
	Node[] separate(int l, int r) {
		final Node left = Node.cut(getLeft(find(l)));
		final Node mid = find(r - l);
		final Node right = Node.cut(getRight(mid));

		sep[0] = left;
		sep[1] = mid;
		sep[2] = right;

		return sep;
	}
	
	// cut from SplayTree [0, i)
	Node cut(int i) {
		return Node.cut(getLeft(find(i)));
	}
	
	// maybe bug, [l, r] -> [i, i + r - l]
	void move(int l, int r, int i) {
		Node left = Node.cut(getLeft(find(l)));
		final Node mid = find(r - l);
		Node right = Node.cut(getRight(mid));
		
		root = Node.merge(left, right);
		if(find(i) == null) {
			left = root;
			root = null;
		}
		else {
			left = Node.cut(getLeft(find(i)));
		}
		root = Node.merge(Node.merge(left, mid), root);
	}

	// all operation [l,r]
	// reverse [l,r]
	void reverse(int l, int r) {
		Node[] sep = separate(l, r);
		sep[1].reverse();
		root = Node.merge(Node.merge(sep[0], sep[1]), sep[2]);
	}

	// revolve [l,l+1,l+2,...,r] -> [r-t+1,r-t+2,..,r,l,l+1,...,r-t]
	void revolve(int l, int r, int t) {
		rotate(l, r, t % (r - l + 1));
	}

	// same revolve (right rotate t elements)
	void rotate(int l, int r, int t) {
		if(r - l < t) while(true);
		Node[] sep = separate(l, r);

		Node n = find(sep[1], r - l - t);
		Node nr = Node.cut(getRight(n));
		root = Node.merge(Node.merge(sep[0], nr), Node.merge(n, sep[2]));
	}

	// max elem [l,r]
	int max(int l, int r) {
		Node[] sep = separate(l, r);
		final int res = sep[1].pushDown().max;
		root = Node.merge(Node.merge(sep[0], sep[1]), sep[2]);
		return res;
	}

	// min elem [l,r]
	int min(int l, int r) {
		Node[] sep = separate(l, r);
		final int res = sep[1].pushDown().min;
		root = Node.merge(Node.merge(sep[0], sep[1]), sep[2]);
		return res;
	}

	// sum [l,r]
	int sum(int l, int r) {
		Node[] sep = separate(l, r);
		final int res = sep[1].pushDown().sum;
		root = Node.merge(Node.merge(sep[0], sep[1]), sep[2]);
		return res;
	}

	// add [l,r] val
	void add(int l, int r, int val) {
		Node[] sep = separate(l, r);
		sep[1].addSubTree(val);
		root = Node.merge(Node.merge(sep[0], sep[1]), sep[2]);
	}

	static class Node {
		int value, sum, min, max, count, dval;
		boolean reverse, needPushDown;
		Node left, right, parent;

		void update() {
			count = 1;
			min = max = sum = value;
			if(getLeft() != null) {
				count += left.count;
				sum += left.sum;
				min = Math.min(min, left.min);
				max = Math.max(max, left.max);
			}
			if(getRight() != null) {
				count += right.count;
				sum += right.sum;
				min = Math.min(min, right.min);
				max = Math.max(max, right.max);
			}
			sum += count * dval;
			min += dval;
			max += dval;
		}

		// all operation [l,r]
				// reverse subtree
		void reverse() {
			reverse = !reverse;
			needPushDown = true;
		}

		// add subtree
		void addSubTree(int val) {
			dval += val;
			sum += val * count;
			needPushDown = true;
		}

		// eval lazy value from parent
		static void receiveLazyValue(Node n) {
			if(n != null) {
				n.dval += n.parent.dval;
				n.reverse ^= n.parent.reverse;
				n.min += n.parent.dval;
				n.max += n.parent.dval;
				n.sum += n.parent.dval * n.count;
				n.needPushDown = true;
			}
		}

		// eval lazy value
		Node pushDown() {
			if(needPushDown) {
				receiveLazyValue(left);
				receiveLazyValue(right);
				value += dval;
				dval = 0;
				if(reverse) {
					final Node n = left;
					left = right;
					right = n;
					reverse = false;
				}
				needPushDown = false;
			}
			return this;
		}

		Node getLeft() { pushDown(); return left; }
		Node getRight() { pushDown(); return right; }

		// merge two node. left, right
		static Node merge(final Node nl, final Node nr) {
			if(nl == null) return nr;
			if(nr == null) return nl;
			nl.splay();
			nr.splay();
			final Node leftMaxNode = nl.maxNode();
			Node.linkRight(nr, leftMaxNode);
			return leftMaxNode;
		}

		// p is parent of n. n is left child of p.
		static void linkLeft(final Node n, final Node p) {
			if(p != null) { p.pushDown(); cut(p.getLeft()); p.left = n; }
			if(n != null) { n.parent = p; }
			if(p != null) { p.update(); }
		}

		// p is parent of n. n is right child of p.
		static void linkRight(final Node n, final Node p) {
			if(p != null) { p.pushDown(); cut(p.getRight()); p.right = n; }
			if(n != null) { n.parent = p; }
			if(p != null) { p.update(); }
		}

		// cut n and parent of n.
		static Node cut(final Node n) {
			if(n == null || n.parent == null) { return n; }
			n.parent.pushDown();
			if(n.parent.left == n) {
				n.parent.left = null;
			}
			else {
				n.parent.right = null;
			}
			n.parent.update();
			n.parent = null;
			return n;
		}

		public Node(int value, Node parent) {
			this.value = value;
			this.parent = parent;
			update();
		}

		void rotateRight() {
			final Node x = this;
			final Node p = x.parent;
			final Node g = p.parent;
//			if(g != null) g.pushDown();
			p.pushDown();
			x.pushDown();
			p.left = x.right;
			if(x.right != null) { x.right.parent = p; }
			p.parent = x;
			x.right = p;
			x.parent = g;
			p.update();
			x.update();
			if(g != null) {
				if(g.left == p) g.left = x;
				else if(g.right == p) g.right = x;
//				g.update();
			}
		}

		void rotateLeft() {
			final Node x = this;
			final Node p = x.parent;
			final Node g = p.parent;
//			if(g != null) g.pushDown();
			p.pushDown();
			x.pushDown();
			p.right = x.left;
			if(x.left != null) { x.left.parent = p; }
			p.parent = x;
			x.left = p;
			x.parent = g;
			p.update();
			x.update();
			if(g != null) {
				if(g.left == p) g.left = x;
				else if(g.right == p) g.right = x;
//				g.update();
			}
		}

		public Node splay() {
			final Node x = this;
			while(x.parent != null) {
				final Node p = x.parent;
				if(p.parent == null) {
					// zig step
					if(p.getLeft() == x) { x.rotateRight(); }
					else { x.rotateLeft(); }
				}
				else {
					final Node g = p.parent;
					// zig-zig step / zig-zag step
					if(g.getLeft() == p) {
						if(p.getLeft() == x) { p.rotateRight(); x.rotateRight(); }
						else { x.rotateLeft(); x.rotateRight(); }
					}
					else {
						if(p.getLeft() == x) { x.rotateRight(); x.rotateLeft(); }
						else { p.rotateLeft(); x.rotateLeft(); }
					}
				}
			}
			return x;
		}

		Node maxNode() {
			Node n = this;
			while(true) {
				n.pushDown();
				if(n.right == null) break;
				n = n.right;
			}
			return n.splay();
		}

		Node minNode() {
			Node n = this;
			while(true) {
				n.pushDown();
				if(n.left == null) break;
				n = n.left;
			}
			return n.splay();
		}
	}
}



	static void arrayIntSort(int[][] x, int... keys) {
		Arrays.sort(x, new ArrayIntsComparator(keys));
	}
	
	static class ArrayIntsComparator implements Comparator<int[]> {
		final int[] KEY;
		
		public ArrayIntsComparator(int... key) {
			KEY = key;
		}
		
		@Override
		public int compare(int[] o1, int[] o2) {
			for(int k : KEY) if(o1[k] != o2[k]) return o1[k] - o2[k];
			return 0;
		}
	}
	
	static class ArrayIntComparator implements Comparator<int[]> {
		final int KEY;
		
		public ArrayIntComparator(int key) {
			KEY = key;
		}
		
		@Override
		public int compare(int[] o1, int[] o2) {
			return o1[KEY] - o2[KEY];
		}
	}
	
	void main() throws IOException {
		//		IOFast.setFileIO("rle-size.in", "rle-size.out");
		try {
			run();
		}
		catch (EndOfFileRuntimeException e) { }
		io.out.flush();
	}

	public static void main(String[] args) throws IOException {
		new D().main();
	}
	
	static class EndOfFileRuntimeException extends RuntimeException {
		private static final long serialVersionUID = -8565341110209207657L; }

	static
	public class IOFast {
		private BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		private PrintWriter out = new PrintWriter(System.out);

		void setFileIO(String ins, String outs) throws IOException {
			in = new BufferedReader(new FileReader(ins));
			out = new PrintWriter(new FileWriter(outs));
		}

		//		private static final int BUFFER_SIZE = 50 * 200000;
		private static int pos, readLen;
		private static final char[] buffer = new char[1024 * 8];
		private static char[] str = new char[500*8*2];
		private static boolean[] isDigit = new boolean[256];
		private static boolean[] isSpace = new boolean[256];
		private static boolean[] isLineSep = new boolean[256];

		static {
			for(int i = 0; i < 10; i++) { isDigit['0' + i] = true; }
			isDigit['-'] = true;
			isSpace[' '] = isSpace['\r'] = isSpace['\n'] = isSpace['\t'] = true;
			isLineSep['\r'] = isLineSep['\n'] = true;
		}

		public int read() throws IOException {
			if(pos >= readLen) {
				pos = 0;
				readLen = in.read(buffer);
				if(readLen <= 0) { throw new EndOfFileRuntimeException(); }
			}
			return buffer[pos++];
		}

		public int nextInt() throws IOException {
			return Integer.parseInt(nextString());
		}

		public long nextLong() throws IOException {
			return Long.parseLong(nextString());
		}

		public char nextChar() throws IOException {
			while(true) {
				final int c = read();
				if(!isSpace[c]) { return (char)c; }
			}
		}
		
		int reads(int len, boolean[] accept) throws IOException {
			try {
				while(true) {
					final int c = read();
					if(accept[c]) { break; }
					
					if(str.length == len) {
						char[] rep = new char[str.length * 3 / 2];
						System.arraycopy(str, 0, rep, 0, str.length);
						str = rep;
					}
					
					str[len++] = (char)c;
				}
			}
			catch(EndOfFileRuntimeException e) { ; }
			
			return len;
		}
		
		int reads(char[] cs, int len, boolean[] accept) throws IOException {
			try {
				while(true) {
					final int c = read();
					if(accept[c]) { break; }
					cs[len++] = (char)c;
				}
			}
			catch(EndOfFileRuntimeException e) { ; }
			
			return len;
		}

		public char[] nextLine() throws IOException {
			int len = 0;
			str[len++] = nextChar();
			len = reads(len, isLineSep);
			
			try {
				if(str[len-1] == '\r') { len--; read(); }
			}
			catch(EndOfFileRuntimeException e) { ; }
			
			return Arrays.copyOf(str, len);
		}

		public String nextString() throws IOException {
			return new String(next());
		}

		public char[] next() throws IOException {
			int len = 0;
			str[len++] = nextChar();
			len = reads(len, isSpace);
			return Arrays.copyOf(str, len);
		}

		public int next(char[] cs) throws IOException {
			int len = 0;
			cs[len++] = nextChar();
			len = reads(cs, len, isSpace);
			return len;
		}

		public double nextDouble() throws IOException {
			return Double.parseDouble(nextString());
		}

		public long[] nextLongArray(final int n) throws IOException {
			final long[] res = new long[n];
			for(int i = 0; i < n; i++) {
				res[i] = nextLong();
			}
			return res;
		}

		public int[] nextIntArray(final int n) throws IOException {
			final int[] res = new int[n];
			for(int i = 0; i < n; i++) {
				res[i] = nextInt();
			}
			return res;
		}

		public int[][] nextIntArray2D(final int n, final int k) throws IOException {
			final int[][] res = new int[n][];
			for(int i = 0; i < n; i++) {
				res[i] = nextIntArray(k);
			}
			return res;
		}

		public int[][] nextIntArray2DWithIndex(final int n, final int k) throws IOException {
			final int[][] res = new int[n][k+1];
			for(int i = 0; i < n; i++) {
				for(int j = 0; j < k; j++) {
					res[i][j] = nextInt();
				}
				res[i][k] = i;
			}
			return res;
		}

		public double[] nextDoubleArray(final int n) throws IOException {
			final double[] res = new double[n];
			for(int i = 0; i < n; i++) {
				res[i] = nextDouble();
			}
			return res;
		}

	}

}