Using HashMap, storing all possible substrings of any string you add to the contacts: AC, 0.7s on testcases

public static void main(String[] args) throws Exception{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    int numQueries = Integer.parseInt(br.readLine());
    HashMap<String, Integer> map = new HashMap<String, Integer>();

    for (int i = 0; i < numQueries; i++){
        String[] data = br.readLine().split(" ");

        if (data[0].equals("add")){
            for (int j = 1; j <= data[1].length(); j++){
                String sub = data[1].substring(0, j);
                if (map.get(sub) == null){
                    map.put(sub, 1);
                } else {
                    map.put(sub, map.get(sub) + 1);
                }
            }
        } else { //query matches
            if (map.get(data[1]) == null){
                System.out.println(0);
            } else {
                System.out.println(map.get(data[1]));
            }

        }
    }
}