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.StringTokenizer;

public class C2 {
    private FastScanner in;
    private PrintWriter out;

    public C2(FastScanner in, PrintWriter out) {
        this.in = in;
        this.out = out;
    }

    public static void main(String[] args) {
        try (
                FastScanner in = new FastScanner(System.in);
                PrintWriter out = new PrintWriter(System.out);
        ) {
            C2 solution = new C2(in, out);
            solution.solve();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void solve() throws IOException {
        int t = in.nextInt();
        while (t-- > 0) {
            int n = in.nextInt();
            int q = in.nextInt();
            int[] array = new int[n];
            for (int i = 0; i < n; i++) {
                array[i] = in.nextInt();
            }
            Tree tree = new Tree(array);
            out.println(tree.getResult());
            while (q-- > 0) {
                int l = in.nextInt() - 1;
                int r = in.nextInt() - 1;
                if (l != r) {
                    tree.change(l, array[r]);
                    tree.change(r, array[l]);
                    array[r] ^= array[l];
                    array[l] ^= array[r];
                    array[r] ^= array[l];
                }
                out.println(tree.getResult());
            }
        }
    }

    public static class FastScanner implements Closeable {
        BufferedReader bufferedReader;
        StringTokenizer stringTokenizer;

        public FastScanner(InputStream inputStream) {
            this.bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
        }

        public FastScanner(File file) throws FileNotFoundException {
            this(new FileInputStream(file));
        }

        public String next() throws IOException {
            while (stringTokenizer == null || !stringTokenizer.hasMoreTokens()) {
                String line = bufferedReader.readLine();
                if (line == null) {
                    throw new EOFException("End of input stream is reached.");
                }
                stringTokenizer = new StringTokenizer(line);
            }
            return stringTokenizer.nextToken();
        }

        public String nextLine() throws IOException {
            stringTokenizer = null;
            return bufferedReader.readLine();
        }

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

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

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

        @Override
        public void close() throws IOException {
            bufferedReader.close();
        }
    }

    private class Tree {
        private final static long INF = -1_000_000_000_000L;
        Node root;

        Tree(int[] array) {
            this.root = build(0, array.length, array);
        }

        public long getResult() {
            return Math.max(root.pp, root.pn);
        }

        public void change(int i, int val) {
            change(root, i, val);
        }

        private Node build(int l, int r, int[] array) {
            Node node = new Node(l, r);
            if (node.isLeaf()) {
                setUpLeaf(node, array[l]);
            } else {
                int mid = (l + r) / 2;
                node.leftSon = build(l, mid, array);
                node.rightSon = build(mid, r, array);
                fixNode(node);
            }
            return node;
        }

        private void change(Node node, int i, long val) {
            if (i < node.lB || i >= node.rB) {
                return;
            }
            if (node.isLeaf()) {
                setUpLeaf(node, val);
            } else {
                change(node.leftSon, i, val);
                change(node.rightSon, i, val);
                fixNode(node);
            }
        }

        private void setUpLeaf(Node node, long val) {
            node.pp = val;
            node.nn = -val;
            node.np = INF;
            node.pn = INF;
        }

        private void fixNode(Node node) {
            if (!node.isLeaf()) {
                Node leftSon = node.leftSon;
                Node rightSon = node.rightSon;
                node.nn = Math.max(
                        Math.max(leftSon.nn, rightSon.nn),
                        Math.max(leftSon.nn + rightSon.pn, leftSon.np + rightSon.nn)
                );
                node.np = Math.max(
                        Math.max(leftSon.np, rightSon.np),
                        Math.max(leftSon.nn + rightSon.pp, leftSon.np + rightSon.np)
                );
                node.pn = Math.max(
                        Math.max(leftSon.pn, rightSon.pn),
                        Math.max(leftSon.pn + rightSon.pn, leftSon.pp + rightSon.nn)
                );
                node.pp = Math.max(
                        Math.max(rightSon.pp, leftSon.pp),
                        Math.max(leftSon.pp + rightSon.np, leftSon.pn + rightSon.pp)
                );
            }
        }

        private class Node {
            long np;
            long pp;
            long nn;
            long pn;
            int lB;
            int rB;
            Node leftSon;
            Node rightSon;

            public Node(int lB, int rB) {
                this.lB = lB;
                this.rB = rB;
            }

            public int getSize() {
                return rB - lB;
            }

            public boolean isLeaf() {
                return getSize() == 1;
            }
        }
    }
}