Problem: This is the easy version of the problem. The difference between the versions is that the easy version has no swap operations. You can make hacks only if all versions of the problem are solved.

Pikachu is a cute and friendly pokémon living in the wild pikachu herd.

But it has become known recently that infamous team R wanted to steal all these pokémon! Pokémon trainer Andrew decided to help Pikachu to build a pokémon army to resist.

First, Andrew counted all the pokémon — there were exactly n pikachu. The strength of the i-th pokémon is equal to a_i, and all these numbers are distinct.

As an army, Andrew can choose any non-empty subsequence of pokemons. In other words, Andrew chooses some array b from k indices such that 1 ≤ b_1 < b_2 < ... < b_k ≤ n, and his army will consist of pokémons with forces a_{b_1}, a_{b_2}, ..., a_{b_k}.

The strength of the army is equal to the alternating sum of elements of the subsequence; that is, a_{b_1} - a_{b_2} + a_{b_3} - a_{b_4} + ....

Andrew is experimenting with pokémon order. He performs q operations. In i-th operation Andrew swaps l_i-th and r_i-th pokémon.

Note: q=0 in this version of the task.

Andrew wants to know the maximal stregth of the army he can achieve with the initial pokémon placement. He also needs to know the maximal strength after each operation.

Help Andrew and the pokémon, or team R will realize their tricky plan!

Input

Each test contains multiple test cases.

The first line contains one positive integer t (1 ≤ t ≤ 10^3) denoting the number of test cases. Description of the test cases follows.

The first line of each test case contains two integers n and q (1 ≤ n ≤ 3 ⋅ 10^5, q = 0) denoting the number of pokémon and number of operations respectively.

The second line contains n distinct positive integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ n) denoting the strengths of the pokémon.

i-th of the last q lines contains two positive integers l_i and r_i (1 ≤ l_i ≤ r_i ≤ n) denoting the indices of pokémon that were swapped in the i-th operation.

It is guaranteed that the sum of n over all test cases does not exceed 3 ⋅ 10^5, and the sum of q over all test cases does not exceed 3 ⋅ 10^5. 

Output

For each test case, print q+1 integers: the maximal strength of army before the swaps and after each swap.

Example

Input


3
3 0
1 3 2
2 0
1 2
7 0
1 2 5 4 3 6 7


Output


3
2
9

Note

In third test case we can build an army in such way: [1 2 5 4 3 6 7], its strength will be 5−3+7=9.

Solution (in JAVA):

Solution:

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

// Try for an hour then stop unless u know your on the right track!!!!!
// If u are on an easy problem and start doing complex things fairly likely u did something wrong
// Be fast
public class cf1420_Div2_C2 {
	
	public static class Pair{
		long plusplus;
		long plusminus;
		long minusminus;
		long minusplus;	
	}
	
	public static Pair[] t;

	public static void init(long[] arr) {
		t = new Pair[4 * arr.length];
		build(arr, 1, 0, arr.length - 1);
	}
	
	public static void combine(Pair x, Pair y, Pair make) {
		make.plusminus = Math.max(x.plusminus, y.plusminus);
		make.plusplus = Math.max(x.plusplus, y.plusplus);
		make.minusplus = Math.max(x.minusplus, y.minusplus);
		make.minusminus = Math.max(x.minusminus, y.minusminus);
		
		make.plusplus = Math.max(make.plusplus, x.plusminus + y.plusplus);
		make.plusplus = Math.max(make.plusplus, x.plusplus + y.minusplus);
		make.plusminus = Math.max(make.plusminus, x.plusplus + y.minusminus);
		make.plusminus = Math.max(make.plusminus, x.plusminus + y.plusminus);
		make.minusminus = Math.max(make.minusminus, x.minusminus + y.plusminus);
		make.minusminus = Math.max(make.minusminus, x.minusplus + y.minusminus);
		make.minusplus = Math.max(make.minusplus, x.minusplus + y.minusplus);
		make.minusplus = Math.max(make.minusplus, x.minusminus + y.plusplus);
	} 
		
	public static void build(long[] arr, int v, int tl, int tr) {
		t[v] = new Pair();
		if (tl == tr) {
			t[v].plusplus = arr[tl];
			t[v].minusminus = -arr[tl];
			return;
		}
		int tm = tl + (tr - tl) / 2;
		build(arr, 2 * v, tl, tm);
		build(arr, 2 * v + 1, tm + 1, tr);
		combine(t[2 * v], t[2 * v + 1], t[v]);
	}
	
	public static void update(int v, int tl, int tr, int pos, long val) {
		if (tl == tr) {
			t[v].plusplus = val;
			t[v].minusminus = -val ;
			return;
		}
		int tm = tl + (tr - tl) / 2;
		if (pos <= tm)
			update(2 * v, tl, tm, pos, val);
		else
			update(2 * v + 1, tm + 1, tr, pos, val);
		combine(t[2 * v], t[2 * v + 1], t[v]);
	}
	
	public static long answer() {
		return Math.max(t[1].plusplus, t[1].plusminus);
	}
		
    public static void main(String[] args) throws IOException {
        FastScanner in = new FastScanner(System.in);
        PrintWriter out = new PrintWriter(System.out);
        
        int t = in.nextInt();
        for ( ; t > 0; t--) {
        	int n = in.nextInt();
        	int q = in.nextInt();
        	long[] arr = new long[n];
        	for (int i = 0; i < n; i++)
        		arr[i] = in.nextInt();
        	init(arr);
        	out.println(answer());
        	for (int i = 0; i < q; i++) {
        		int l = in.nextInt();
        		int r = in.nextInt();
        		long v1 = arr[l - 1];
        		long v2 = arr[r - 1];
        		update(1, 0, arr.length - 1, l - 1, v2);
        		update(1, 0, arr.length - 1, r - 1, v1);
        		out.println(answer());
        		arr[l - 1] = v2;
        		arr[r - 1] = v1;
        	}
        	// out.print(str.toString());
        }
        out.close();
    }
    
    public static void shuffle(int[] arr) {
    	Random rgen = new Random();
    	
    	for (int i = 0; i < arr.length; i++) {
    		int rPos = rgen.nextInt(arr.length);
    		int temp = arr[i];
    		arr[i] = arr[rPos];
    		arr[rPos]=temp;
    	}
    }

    static class FastScanner {
        private final InputStream stream;
        private final byte[] buf = new byte[8192];
        private int curChar, numChars;
        private SpaceCharFilter filter;
 
        FastScanner(InputStream stream) {
            this.stream = stream;
        }
 
        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++];
        }
 
        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;
        }
 
        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;
        }
 
        String next() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }
 
        boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }
 
        interface SpaceCharFilter {
            boolean isSpaceChar(int ch);
        }
    }
}