Problem: Ehab loves number theory, but for some reason he hates the number x. Given an array a, find the length of its longest subarray such that the sum of its elements isn't divisible by x, or determine that such subarray doesn't exist.

An array a is a subarray of an array b if a can be obtained from b by deletion of several (possibly, zero or all) elements from the beginning and several (possibly, zero or all) elements from the end.

Input

The first line contains an integer t (1 ≤ t ≤ 5) — the number of test cases you need to solve. The description of the test cases follows.

The first line of each test case contains 2 integers n and x (1 ≤ n ≤ 10^5, 1 ≤ x ≤ 10^4) — the number of elements in the array a and the number that Ehab hates.

The second line contains n space-separated integers a_1, a_2, …, a_{n} (0 ≤ a_i ≤ 10^4) — the elements of the array a.

Output

For each testcase, print the length of the longest subarray whose sum isn't divisible by x. If there's no such subarray, print -1.

Example

Input


3
3 3
1 2 3
3 4
1 2 3
2 2
0 6


Output


2
3
-1

Note

In the first test case, the subarray [2,3] has sum of elements 5, which isn't divisible by 3.

In the second test case, the sum of elements of the whole array is 6, which isn't divisible by 4.

In the third test case, all subarrays have an even sum, so the answer is -1.

Solution (in JAVA):

Solution:


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.InputMismatchException;
import java.util.LinkedList;
import java.util.List;
 
 
public class Solution implements Runnable {
 
    public void run() {
 
        InputReader input = new InputReader(System.in);
        PrintWriter w = new PrintWriter(System.out);
        	
        int t= input.nextInt();
        
        while(t-->0)
        {
        	int n =input.nextInt();
        	int x = input.nextInt();
        	
        	int[] arr =new int[n];
        	int ans=0;
        	for(int i=0;i< n;i++)
        	{
        		arr[i]=input.nextInt();
        		ans+=arr[i]%x;
        	}
        	if(ans%x!=0)
        		System.out.println(n);
        	else if(ans==0)
        	{
        			System.out.println(-1);
        	}
        	else
        	{
        		int l=0;
        		int r=0;
        		for(int i=0;i< n;i++)
        		{
        			if(arr[i]%x!=0)
        			{
        				l=i+1;
        				break;
        			}
        		}
        		
        		for(int j=n-1;j>=0;j--)
        		{
        			if(arr[j]%x!=0)
        			{
        				r=j;
        				break;
        			}
        		}
        		r=n-r;
        		System.out.println(n - Math.min(l, r));
        	}
        	
        }
      
        }
        	
class Sorting implements Comparator<pair>
{
	public int compare(pair one, pair two)
	{
		if(one.a>two.a)
			return 1;
		else if(one.a==two.a)
			return 0;
		else 
			return -1;
				
	}
}
class pair
{
	int a;
	int b;
	
	pair(int a ,int b)
	{
		this.a=a;
		this.b=b;
	}
		
}
 
    class Graph{
        private final int v;
        private List<List<Integer>> adj;
        Graph(int v){
            this.v = v;
            adj = new ArrayList<>(v);
            for(int i=0;i<v;i++){
                adj.add(new LinkedList<>());
            }
        }
        private void addEdge(int a,int b){
            adj.get(a).add(b);
        }
        private boolean isCyclic()
        {
            boolean[] visited = new boolean[v];
            boolean[] recStack = new boolean[v];
            for (int i = 0; i < v; i++)
                if (isCyclicUtil(i, visited, recStack))
                    return true;
 
            return false;
        }
        private boolean isCyclicUtil(int i, boolean[] visited, boolean[] recStack)
        {
            if (recStack[i])
                return true;
            if (visited[i])
                return false;
            visited[i] = true;
            recStack[i] = true;
            List<Integer> children = adj.get(i);
            for (Integer c: children)
                if (isCyclicUtil(c, visited, recStack))
                    return true;
            recStack[i] = false;
            return false;
        }
    }
    public static void sortbyColumn(int arr[][], int col)
    {
 
        Arrays.sort(arr, new Comparator<int[]>()
        {
            public int compare(int[] o1, int[] o2){
                return(Integer.valueOf(o1[col]).compareTo(o2[col]));
            }
        });
 
    }
    static long gcd(long a, long b)
    {
        if (b == 0)
            return a;
        return gcd(b, a % b);
    }
    public static class DJSet {
        public int[] upper;
 
        public DJSet(int n) {
            upper = new int[n];
            Arrays.fill(upper, -1);
        }
 
        public int root(int x) {
            return upper[x] < 0 ? x : (upper[x] = root(upper[x]));
        }
 
        public boolean equiv(int x, int y) {
            return root(x) == root(y);
        }
 
        public boolean union(int x, int y) {
            x = root(x);
            y = root(y);
            if (x != y) {
                if (upper[y] < upper[x]) {
                    int d = x;
                    x = y;
                    y = d;
                }
                upper[x] += upper[y];
                upper[y] = x;
            }
            return x == y;
        }
    }
    public static int[] radixSort(int[] f)
    {
        int[] to = new int[f.length];
        {
            int[] b = new int[65537];
            for(int i = 0;i < f.length;i++)b[1+(f[i]&0xffff)]++;
            for(int i = 1;i <= 65536;i++)b[i]+=b[i-1];
            for(int i = 0;i < f.length;i++)to[b[f[i]&0xffff]++] = f[i];
            int[] d = f; f = to;to = d;
        }
        {
            int[] b = new int[65537];
            for(int i = 0;i < f.length;i++)b[1+(f[i]>>>16)]++;
            for(int i = 1;i <= 65536;i++)b[i]+=b[i-1];
            for(int i = 0;i < f.length;i++)to[b[f[i]>>>16]++] = f[i];
            int[] d = f; f = to;to = d;
        }
        return f;
    }
    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;
        private BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 
        public InputReader(InputStream stream) {
            this.stream = stream;
        }
 
        public int read() {
            if (numChars==-1)
                throw new InputMismatchException();
 
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                }
                catch (IOException e) {
                    throw new InputMismatchException();
                }
 
                if(numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }
 
        public String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
        public int nextInt() {
            int c = read();
 
            while(isSpaceChar(c))
                c = read();
 
            int sgn = 1;
 
            if (c == '-') {
                sgn = -1;
                c = read();
            }
 
            int res = 0;
            do {
                if(c<'0'||c>'9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));
 
            return res * sgn;
        }
 
        public long nextLong() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            long res = 0;
 
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));
            return res * sgn;
        }
 
        public double nextDouble() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            double res = 0;
            while (!isSpaceChar(c) && c != '.') {
                if (c == 'e' || c == 'E')
                    return res * Math.pow(10, nextInt());
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            if (c == '.') {
                c = read();
                double m = 1;
                while (!isSpaceChar(c)) {
                    if (c == 'e' || c == 'E')
                        return res * Math.pow(10, nextInt());
                    if (c < '0' || c > '9')
                        throw new InputMismatchException();
                    m /= 10;
                    res += (c - '0') * m;
                    c = read();
                }
            }
            return res * sgn;
        }
 
        public String readString() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            }
            while (!isSpaceChar(c));
 
            return res.toString();
        }
 
        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }
 
        public String next() {
            return readString();
        }
 
        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    }
    public static void main(String args[]) throws Exception {
        new Thread(null, new Solution(),"TaskA",1<<26).start();
    }
}