# HackerRank Solutions – Binary Search – Ice Cream Parlor – Java Solution

All credits to Rodney Shaghoulian for this simple solution for the HackerRank challenge – Binary Search – Ice Cream Parlor. This solution is written in Java.

```// Author: Rodney Shaghoulian
// Github: github.com/RodneyShag

import java.util.Scanner;
import java.util.HashMap;

//  Time Complexity: O(n)
// Space Complexity: O(n)
public class Solution {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int t = scan.nextInt();
while (t-- > 0) {
int m = scan.nextInt();
int n = scan.nextInt();
int [] costs = new int[n];
for (int i = 0; i < n; i++) {
costs[i] = scan.nextInt();
}
}
scan.close();
}

public static void buyIceCream(int [] costs, int money) {
HashMap<Integer, Integer> map = new HashMap<>(); // key = cost, value = ice cream ID
for (int i = 0; i < costs.length; i++) {
int icecreamID = i + 1;
int cost       = costs[i];

/* Find 2 flavors to buy that sum to "money" */
int otherCost  = money - cost;
if (map.containsKey(otherCost)) {
System.out.println(map.get(otherCost) + " " + icecreamID);
}

map.putIfAbsent(cost, icecreamID);
}
}
}```
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