JAVA 백준10825 국영수(BOJ10825)

문제링크 : https://www.acmicpc.net/problem/10825

Comparable 인터페이스 사용해보기 좋은 문제였다.

10825번: 국영수

import java.io.*;
import java.util.*;

public class Main {
    static FastReader scan = new FastReader(); // 입력
    static StringBuilder sb = new StringBuilder(); //제출답안

    static int N;
    static StudentInfo[] scoreList;


    static void input() { //입력함수
        N = scan.nextInt();
        scoreList = new StudentInfo[N];

        for(int i =0; i < N; i++) {
            scoreList[i] = new StudentInfo();
            scoreList[i].name = scan.next();
            scoreList[i].korean = scan.nextInt();
            scoreList[i].english = scan.nextInt();
            scoreList[i].math = scan.nextInt();
        }
    }

    public static void main(String[] args) {
        input(); // 입력

        Arrays.sort(scoreList);

        for(int i = 0; i < N; i++) {
            sb.append(scoreList[i].name);
            sb.append('\n');
        }
        System.out.println(sb.toString());
    }

    static class StudentInfo implements Comparable<StudentInfo> {
        String name;
        int korean, english, math;

        @Override
        public int compareTo(StudentInfo studentInfo) {
            //국어 내림차순
            if(korean != studentInfo.korean) {
                return studentInfo.korean - korean;
            }
            //영어 오름차순
            if(english != studentInfo.english) {
                return english - studentInfo.english;
            }
            //수학 내림차순
            if(math != studentInfo.math) {
                return studentInfo.math - math;
            }
            //이름 오름차순
            return name.compareTo(studentInfo.name);
        }
    }


    //류호석 강사님 템플릿
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        public FastReader(String s) throws FileNotFoundException {
            br = new BufferedReader(new FileReader(new File(s)));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}