Problem: There is a road with length l meters. The start of the road has coordinate 0, the end of the road has coordinate l.

There are two cars, the first standing at the start of the road and the second standing at the end of the road. They will start driving simultaneously. The first car will drive from the start to the end and the second car will drive from the end to the start.

Initially, they will drive with a speed of 1 meter per second. There are n flags at different coordinates a_1, a_2, …, a_n. Each time when any of two cars drives through a flag, the speed of that car increases by 1 meter per second.

Find how long will it take for cars to meet (to reach the same coordinate). 

Input

The first line contains one integer t (1 ≤ t ≤ 10^4): the number of test cases.

The first line of each test case contains two integers n, l (1 ≤ n ≤ 10^5, 1 ≤ l ≤ 10^9): the number of flags and the length of the road.

The second line contains n integers a_1, a_2, …, a_n in the increasing order (1 ≤ a_1 < a_2 < … < a_n < l).

It is guaranteed that the sum of n among all test cases does not exceed 10^5.

Output

For each test case print a single real number: the time required for cars to meet.

Your answer will be considered correct, if its absolute or relative error does not exceed 10^{-6}. More formally, if your answer is a and jury's answer is b, your answer will be considered correct if \frac{|a-b|}{max{(1, b)}} ≤ 10^{-6}.

Example

Input


5
2 10
1 9
1 10
1
5 7
1 2 3 4 6
2 1000000000
413470354 982876160
9 478
1 10 25 33 239 445 453 468 477


Output


3.000000000000000
3.666666666666667
2.047619047619048
329737645.750000000000000
53.700000000000000

Note

In the first test case cars will meet in the coordinate 5.

The first car will be in the coordinate 1 in 1 second and after that its speed will increase by 1 and will be equal to 2 meters per second. After 2 more seconds it will be in the coordinate 5. So, it will be in the coordinate 5 in 3 seconds.

The second car will be in the coordinate 9 in 1 second and after that its speed will increase by 1 and will be equal to 2 meters per second. After 2 more seconds it will be in the coordinate 5. So, it will be in the coordinate 5 in 3 seconds.

In the second test case after 1 second the first car will be in the coordinate 1 and will have the speed equal to 2 meters per second, the second car will be in the coordinate 9 and will have the speed equal to 1 meter per second. So, they will meet after (9-1)/(2+1) = 8/3 seconds. So, the answer is equal to 1 + 8/3 = 11/3.

Solution (in JAVA):

Solution:

    import java.util.*;
    import java.lang.*;
    import java.io.*;   
    import java.math.*;
    public class Prac{     
        static class InputReader { 
            private final InputStream stream;
            private final byte[] buf = new byte[8192];
            private int curChar, snumChars;
            public InputReader(InputStream st) {
                this.stream = st;
            } 
            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 ni() {
                int c = read();
                while (isSpaceChar(c)) {
                    c = read();
                }
                int sgn = 1;
                if (c == '-') {
                    sgn = -1;
                    c = read();
                }
                int res = 0;
                do {
                    res *= 10;
                    res += c - '0';
                    c = read();
                } while (!isSpaceChar(c));
                return res * sgn;
            } 
            public long nl() {
                int c = read();
                while (isSpaceChar(c)) {
                c = read();
                }
                int sgn = 1;
                if (c == '-') {
                    sgn = -1;
                    c = read();
                }
                long res = 0;
                do {
                    res *= 10;
                    res += c - '0';
                    c = read();
                } while (!isSpaceChar(c));
                return res * sgn;
            } 
            public int[] nia(int n) {
                int a[] = new int[n];
                for (int i = 0; i < n; i++) {
                    a[i] = ni();
                }
                return a;
            } 
            public int[] nia1(int n) {
                int a[] = new int[n+1];
                for (int i = 1; i <=n; i++) {
                    a[i] = ni();
                }
                return a;
            } 
            public long[] nla(int n) {
                long a[] = new long[n];
                for (int i = 0; i < n; i++) {
                    a[i] = nl();
                }
                return a;
            } 
            public long[] nla1(int n) {
                long a[] = new long[n+1];
                for (int i = 1; i <= n; i++) {
                    a[i] = nl();
                }
                return a;
            } 
            public Long[] nLa(int n) {
                Long a[] = new Long[n];
                for (int i = 0; i < n; i++) {
                    a[i] = nl();
                }
                return a;
            } 
            public Long[] nLa1(int n) {
                Long a[] = new Long[n+1];
                for (int i = 1; i <= n; i++) {
                    a[i] = nl();
                }
                return a;
            } 
            public Integer[] nIa(int n) {
                Integer a[] = new Integer[n];
                for (int i = 0; i < n; i++) {
                    a[i] = ni();
                }
                return a;
            } 
            public Integer[] nIa1(int n) {
                Integer a[] = new Integer[n+1];
                for (int i = 1; i <= n; i++) {
                    a[i] = ni();
                }
                return a;
            } 
            public String rs() {
                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;
            }

            private boolean isEndOfLine(int c) {
                return c == '\n' || c == '\r' || c == -1;
            } 
        }
        public static class Key {
            private final int x, y;
            public Key(int x, int y) {
                this.x = x; this.y = y;
            }
            @Override
            public boolean equals(Object o) {
                if (this == o) return true;
                if (!(o instanceof Key)) return false;
                Key key = (Key) o;
                return x == key.x && y == key.y;
            }   
            @Override
            public int hashCode() {
                int result = x;
                result = 31 * result + y;
                return result;
            }
        }
        static class Pair{
                int x,y;
                Pair(int a,int b){
                        x=a;y=b;
                }
    //            @Override
    //            public int compareTo(Pair p) {
    //                    if(x==p.x) return y-p.y;
    //                    return x-p.x;
    //            }
        }
        static void shuffleArray(int temp[]){
            int n = temp.length;
            Random rnd = new Random();
            for(int i=0; i<n; ++i){
                int tmp = temp[i];
                int randomPos = i + rnd.nextInt(n-i);
                temp[i] = temp[randomPos];
                temp[randomPos] = tmp;
            }   
        }
        static long gcd(long a,long b){ return b==0?a:gcd(b,a%b);}
        static long lcm(long a,long b){return (a/gcd(a,b))*b;}
        static PrintWriter w = new PrintWriter(System.out);
        static long mod=998244353L,mod1=1000000007;
        //static int r[]={0,1,0,-1}, c[]={1,0,-1,0};
        static long modInverse(long a, long m){
            long num=m;
            long x=1;
            long power=a%mod;
            while(num>0){
                  if(num%2==1){
                      x=(x*power)%mod;
                }
                num>>=1;
                power=(power*power)%mod;         
            }
            return x;
        }
        static long fact[]=new long[1000005];
        public static void findFact(){
            fact[0]=1;
            for(int i=1;i<=1000000;i++){
                fact[i]=(i*fact[i-1])%mod;
            }
        } 
        static long ncrWithMod(int n,int r){
            if(n<r)return 0L;

            return (fact[n]*modInverse((fact[r]*fact[n-r])%mod,mod-2))%mod;
        }
        
        public static void main(String [] args){
            InputReader sc=new InputReader(System.in); 
            int t = sc.ni();
            while(t -- > 0 ){
                int n = sc.ni();
                double l = sc.ni();
                double arr[] = new double[n+2];
                for(int i = 1 ; i <= n ; i ++){
                    arr[i] = sc.ni();
                }
                arr[0] = 0;
                arr[n+1] = l;
                double left[] = new double[n+2];
                double right[] = new double[n+2];
                double s = 1;
                for(int i = 1 ; i <= n+1 ; i ++){
                    left[i] = (arr[i] - arr[i-1])/s;
                    left[i] += left[i-1];
                    s++;
                }
                s=1;
                for(int i = n ; i >= 0 ; i --){
                    right[i] = (arr[i+1] - arr[i])/s;
                    right[i] += right[i+1];
                    s++;
                }
                for(int i = 0 ; i < n+2 ; i ++){
                    if(left[i] > right[i]){
                        //w.println(i);
                        double diff = right[i] - left[i - 1];
                        double dis = diff * (i*1D);
                        
                        double sp = (i) + (n - i + 2);
                        double di = arr[i] - arr[i-1] - dis;
                        double ti = di/sp;
                        w.println(right[i] + ti);
                        break;
                    }
                    else if(left[i] == right[i]){
                        w.println(left[i]);
                        break;
                    }
                }
                
                for(int i = 0 ; i < n+2 ; i++){
                    //w.print(left[i] +" ");
                }
                w.println();
                for(int i = 0 ; i < n+2 ; i++){
                    //w.print(right[i] +" ");
                }
            }
            w.close();
        }
    }