Question2.java

import java.util.HashMap;
import java.util.Map;

    class Question2 {
        public static final int MAX_UNICODE = 65_535;

        public static void main(String[] args) {
            System.out.println(checkWhetherStringIsUnique("Competitive Programming"));
        }

        public static boolean checkWhetherStringIsUnique(String string) {
            Map<Character, Integer> characters = new HashMap<>();

            // Write your code here...
            char[] c = string.toCharArray();
            char[] temp = c;
            for (int i = 0; i < c.length; i++) {
                int count = 0;
                if (characters.containsKey(c[i])) {
                    count = characters.get(c[i]);
                    characters.put(c[i], ++count);
                }
            }
            for (int i : characters.values()) {
                if (i > 1)
                    return false;
            }
            return true;
        }
    }