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.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        OutputWriter out = new OutputWriter(outputStream);
        TaskC2 solver = new TaskC2();
        int testCount = Integer.parseInt(in.next());
        for (int i = 1; i <= testCount; i++)
            solver.solve(i, in, out);
        out.close();
    }

    static class TaskC2 {
        public void solve(int testNumber, InputReader in, OutputWriter out) {
            int n = in.nextInt(), q = in.nextInt();
            long[] a = in.readLongArray(n);
            TaskC2.SegmentTree T = new TaskC2.SegmentTree(a);
            out.println(T.answer());

            for (int i = 0; i < q; i++) {
                int l = in.nextInt() - 1, r = in.nextInt() - 1;
                T.swap(l, r);
                out.println(T.answer());
            }
        }

        public static class SegmentTree {
            int n;
            Node[] tree;
            long[] arr;

            static Node unite(Node a, Node b) {
                Node res = new Node();
                res.oddplus = Long.max(a.oddplus + b.evenminus, a.evenplus + b.oddplus);
                res.oddminus = Long.max(a.oddminus + b.evenplus, a.evenminus + b.oddminus);

                res.evenplus = Long.max(a.oddplus + b.oddminus, a.evenplus + b.evenplus);
                res.evenminus = Long.max(a.oddminus + b.oddplus, a.evenminus + b.evenminus);

                return res;
            }

            void pull(int x, int y) {
                tree[x] = unite(tree[x + 1], tree[y]);
            }

            SegmentTree(int n) {
                this.n = n;
                tree = new Node[2 * n - 1];
                for (int i = 0; i < tree.length; i++) tree[i] = new Node();
                build(0, 0, n - 1);
            }

            SegmentTree(long[] v) {
                n = v.length;
                arr = v.clone();
                tree = new Node[2 * n - 1];
                for (int i = 0; i < tree.length; i++) tree[i] = new Node();
                build(0, 0, n - 1, v);
            }

            void build(int x, int l, int r) {
                if (l == r) {
                    return;
                }
                int m = (l + r) >> 1;
                int y = x + ((m - l + 1) << 1);
                build(x + 1, l, m);
                build(y, m + 1, r);
                pull(x, y);
            }

            void build(int x, int l, int r, long[] v) {
                if (l == r) {
                    tree[x].apply(v[l]);
                    return;
                }
                int m = (l + r) >> 1;
                int y = x + ((m - l + 1) << 1);
                build(x + 1, l, m, v);
                build(y, m + 1, r, v);
                pull(x, y);
            }

            public Node get(int ll, int rr) {
                return get(ll, rr, 0, 0, n - 1);
            }

            Node get(int ll, int rr, int x, int l, int r) {
                if (ll <= l && r <= rr) {
                    return tree[x];
                }
                int m = (l + r) >> 1;
                int y = x + ((m - l + 1) << 1);
                Node res;
                if (rr <= m) {
                    res = get(ll, rr, x + 1, l, m);
                } else {
                    if (ll > m) {
                        res = get(ll, rr, y, m + 1, r);
                    } else {
                        res = unite(get(ll, rr, x + 1, l, m), get(ll, rr, y, m + 1, r));
                    }
                }
                pull(x, y);
                return res;
            }

            void modify(int ll, int rr, long v) {
                modify(ll, rr, v, 0, 0, n - 1);
            }

            void modify(int ll, int rr, long v, int x, int l, int r) {
                if (ll <= l && r <= rr) {
                    tree[x].apply(v);
                    return;
                }
                int m = (l + r) >> 1;
                int y = x + ((m - l + 1) << 1);
                if (ll <= m) {
                    modify(ll, rr, v, x + 1, l, m);
                }
                if (rr > m) {
                    modify(ll, rr, v, y, m + 1, r);
                }
                pull(x, y);
            }

            Long answer() {
                Node node = get(0, n - 1);
                return Long.max(node.oddplus, node.evenplus);
            }

            void swap(int i, int j) {
                modify(i, i, arr[j]);
                modify(j, j, arr[i]);
                long v = arr[i];
                arr[i] = arr[j];
                arr[j] = v;
            }

            public static class Node {
                long oddplus;
                long oddminus;
                long evenplus;
                long evenminus;

                void apply(long v) {
                    evenplus = evenminus = 0;
                    oddplus = v;
                    oddminus = -v;
                }

            }

        }

    }

    static class OutputWriter {
        private final PrintWriter writer;

        public OutputWriter(OutputStream outputStream) {
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
        }

        public OutputWriter(Writer writer) {
            this.writer = new PrintWriter(writer);
        }

        public void println(Object... objects) {
            for (int i = 0; i < objects.length; i++) {
                if (i != 0) {
                    writer.print(' ');
                }
                writer.print(objects[i]);
            }
            writer.print('\n');
        }

        public void close() {
            writer.close();
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputReader.SpaceCharFilter filter;

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

        public long[] readLongArray(int size) {
            long[] array = new long[size];
            for (int i = 0; i < size; i++) {
                array[i] = nextLong();
            }
            return array;
        }

        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 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 String next() {
            int c;
            while (isSpaceChar(c = this.read())) {
                ;
            }

            StringBuilder result = new StringBuilder();
            result.appendCodePoint(c);

            while (!isSpaceChar(c = this.read())) {
                result.appendCodePoint(c);
            }

            return result.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

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

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }
}