Ice Cream Parlor

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    Java solution

        public static List<Integer> icecreamParlor(int m, List<Integer> arr) {
            List<Integer> result = new ArrayList<>();
            for (int i = 0; i < arr.size()-1; i++) {
                if(arr.get(i) >= m)
                    continue;
                for (int j = i+1; j < arr.size(); j++) {
                    int sum = arr.get(i) + arr.get(j);
                    if(sum == m){
                        result.add(i+1);
                        result.add(j+1);
                        break;
                    }   
                }
            }
            return result;
        }