[JAVA-자바] 18870번: 좌표 압축

 

HashMap을 사용한 소스코드:

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Arrays;
import java.util.HashMap;
import java.util.StringTokenizer;

public class Main {
    static BufferedReader br;
    static BufferedWriter bw;

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

        HashMap<Integer, Integer> hashMap = new HashMap<>();

        int N = Integer.parseInt(br.readLine());
        int[] dots = new int[N];
        int[] sorted = new int[N];

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

        Arrays.sort(sorted);

        int rank = 0;
        for (int temp : sorted) {
            if (!hashMap.containsKey(temp)) {
                hashMap.put(temp, rank);
                rank++;
            }
        }

        for (int dot : dots) {
            bw.write(hashMap.get(dot) + " ");
        }

        bw.close();
    }
}

 

binarhSearch를 사용한 코드:

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Arrays;
import java.util.HashSet;
import java.util.StringTokenizer;

public class Main {
    static BufferedReader br;
    static BufferedWriter bw;

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

        int N = Integer.parseInt(br.readLine());
        int[] dots = new int[N];
        HashSet<Integer> set = new HashSet<>();

        StringTokenizer st = new StringTokenizer(br.readLine());
        for (int i = 0; i < N; i++) {
            int num = Integer.parseInt(st.nextToken());
            dots[i] = num;
            set.add(num);
        }
        br.close();

        int[] sorted = set.stream().mapToInt(Integer::intValue).sorted().toArray();

        for (int dot : dots) {
            bw.write(Arrays.binarySearch(sorted, dot) + " ");
        }

        bw.close();
    }
}

 

글의 내용 중 잘못된 점이나 수정이 필요한 부분, 혹은 궁금한 사항이 있다면 언제든 댓글로 남겨주시면 감사하겠습니다.

여러분의 피드백은 더 나은 글을 작성하는 데 큰 도움이 됩니다. 감사합니다.