题解 | #游游的元素修改#

import java.io.*;
import java.util.*;
import java.math.BigInteger;

public class Main {
    static void solve() {
        int n = in.nextInt(), l = in.nextInt(), r = in.nextInt();
        long sum = 0, x = 0, y = 0;
        for(int i=0;i<n;i++) {
            long a = in.nextLong();
            sum += a;
            if(a<l) {
                x += l-a;
            }
            if(a>r) {
                y += a-r;
            }
        }
        if(sum/n>=l&&(sum+n-1)/n<=r) {
            out.println(Math.max(x,y));
            return;
        }
        out.println(-1);
    }

    public static void main(String[] args) {
        int T = in.nextInt();
        while(T-->0) {
            solve();
        }
        out.flush();
    }

    static FastReader in = new FastReader();
    static PrintWriter out = new PrintWriter(System.out);

    static class FastReader {
        static BufferedReader br;
        static StringTokenizer st;

        FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            String str = "";
            while (st == null || !st.hasMoreElements()) {
                try {
                    str = br.readLine();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
                st = new StringTokenizer(str);
            }
            return st.nextToken();
        }

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

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

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