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:
// package CodeForces;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;

public class Round672C2 {

	public static class Node {
		long oo, oe, eo, ee; // start - end (odd, even)
		
		public Node(long val) {
			this.ee = val;
			this.oo = -val;
			this.eo = 0;
			this.oe = 0;
		}
		
		public Node(Node A, Node B) {
			// ee
			this.ee = Long.max(A.ee + B.oe, Long.max(A.eo + B.ee, Long.max(A.ee, B.ee)));
			// eo
			this.eo = Long.max(A.ee + B.oo, Long.max(A.eo + B.eo, Long.max(A.eo, B.eo)));
			// oe
			this.oe = Long.max(A.oo + B.ee, Long.max(A.oe + B.oe, Long.max(A.oe, B.oe)));
			// oo
			this.oo = Long.max(A.oo + B.eo, Long.max(A.oe + B.oo, Long.max(A.oo, B.oo)));
		}
	}
	
	public static Node[] st;
	
	public static void Build(int start, int end, int index, int[] arr) {
		if(start == end) {
			st[index] = new Node(arr[start]);
			return;
		}
		int mid = (start + end)>>1;
		Build(start, mid, index<<1, arr);
		Build(mid + 1, end, index<<1|1, arr);
		st[index] = new Node(st[index<<1], st[index<<1|1]);
	}
	
	public static void Update(int start, int end, int index, int idx, int val) {
		if(idx < start || end < idx) {
			return;
		}
		if(start == end) {
			st[index] = new Node(val);
			return;
		}
		int mid = (start + end)>>1;
		Update(start, mid, index<<1, idx, val);
		Update(mid + 1, end, index<<1|1, idx, val);
		st[index] = new Node(st[index<<1], st[index<<1|1]);
	}
	
	public static void solve() {
		int t = s.nextInt();
		while(t-- > 0) {
			int n = s.nextInt();
			int q = s.nextInt();
			int[] arr = s.nextIntArray(n);
			st = new Node[4 * n + 1];
			Build(0, n - 1, 1, arr);
			out.println(Give_Ans(st[1]));
			while(q-- > 0) {
				int l = s.nextInt() - 1;
				int r = s.nextInt() - 1;
				Update(0, n - 1, 1, l, arr[r]);
				Update(0, n - 1, 1, r, arr[l]);
				int temp = arr[l];
				arr[l] = arr[r];
				arr[r] = temp;
				out.println(Give_Ans(st[1]));
			}
		}
	}
	
	public static long Give_Ans(Node A) {
		return Long.max(Long.max(A.ee, A.oo), Long.max(A.oe, A.eo));
	}

	public static void main(String[] args) {
		new Thread(null, null, "Thread", 1 << 27) {
			public void run() {
				try {
					out = new PrintWriter(new BufferedOutputStream(System.out));
					s = new FastReader(System.in);
					solve();
					out.close();
				} catch (Exception e) {
					e.printStackTrace();
					System.exit(1);
				}
			}
		}.start();
	}

	public static PrintWriter out;
	public static FastReader s;

	public static class FastReader {

		private InputStream stream;
		private byte[] buf = new byte[4096];
		private int curChar, snumChars;

		public FastReader(InputStream stream) {
			this.stream = stream;
		}

		public int read() {
			if (snumChars == -1) {
				throw new InputMismatchException();
			}
			if (curChar >= snumChars) {
				curChar = 0;
				try {
					snumChars = stream.read(buf);
				} catch (IOException E) {
					throw new InputMismatchException();
				}
			}
			if (snumChars <= 0) {
				return -1;
			}
			return buf[curChar++];
		}

		public int nextInt() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			int number = 0;
			do {
				number *= 10;
				number += c - '0';
				c = read();
			} while (!isSpaceChar(c));
			return number * sgn;
		}

		public long nextLong() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			long sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			long number = 0;
			do {
				number *= 10L;
				number += (long) (c - '0');
				c = read();
			} while (!isSpaceChar(c));
			return number * sgn;
		}

		public int[] nextIntArray(int n) {
			int[] arr = new int[n];
			for (int i = 0; i < n; i++) {
				arr[i] = this.nextInt();
			}
			return arr;
		}

		public long[] nextLongArray(int n) {
			long[] arr = new long[n];
			for (int i = 0; i < n; i++) {
				arr[i] = this.nextLong();
			}
			return arr;
		}

		public 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();
		}

		public String nextLine() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isEndofLine(c));
			return res.toString();
		}

		public boolean isSpaceChar(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		public boolean isEndofLine(int c) {
			return c == '\n' || c == '\r' || c == -1;
		}

	}

	
}