문제 풀이1. HashMap 사용(메모리 초과)import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.util.Arrays;import java.util.Collections;import java.util.HashMap;import java.util.StringTokenizer;public class Main { public static void main(String[] args) throws IOException { BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer..