IceCreamParlor.java

import java.io.*;
import java.util.*;

public class IceCreamParlor{
    public static void main(String[] args) throws IOException {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            int t = Integer.parseInt(br.readLine().trim());

            for(int i=0; i<t; i++){
                int m = Integer.parseInt(br.readLine().trim());
                int n = Integer.parseInt(br.readLine().trim());
                String[] fstr = br.readLine().trim().split(" ");
                int[] flavors = new int[n];
                
                for(int j=0; j<n; j++){
                   flavors[j] = Integer.parseInt(fstr[j]);
                }

                for(int j=0; j<n; j++){
                    for(int k=j+1;k<n;k++){
                        if(j<k && j!=k && flavors[j] + flavors[k] == m){
                            System.out.println(String.format("%d %d", j + 1, k + 1));
                        }
                    }
                }
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}