[백준 Java] 정렬: - 18870번: 좌표 압축

 

 

import java.io.*;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringBuilder sb = new StringBuilder();
        StringTokenizer st;

        int N = Integer.parseInt(br.readLine());
        int[] origin = new int[N];
        int[] sorted = new int[N];
        HashMap<Integer, Integer> orderMap = new HashMap<Integer, Integer>();

        st = new StringTokenizer(br.readLine());
        for (int i = 0; i < N; i++) {
            sorted[i] = origin[i] = Integer.parseInt(st.nextToken());
        }

        Arrays.sort(sorted);

        int order = 0;
        for (int v : sorted) {
            if (!orderMap.containsKey(v)) {
                orderMap.put(v, order);
                order++;
            }
        }

        for (int key : origin) {
            int ordering = orderMap.get(key);
            sb.append(ordering).append(' ');
        }

        bw.write(String.valueOf(sb));

        br.close();
        bw.flush();
        bw.close();
    }
}