[백준] 4358 생태학 - Data Structure / Java

• 문제 링크

4358번: 생태학

 

• 풀이 과정

 

• 풀이 코드

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Map;
import java.util.TreeMap;

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));

        Map<String, Integer> map = new TreeMap<>();
        int total = 0;

        String input;
        while ((input = br.readLine()) != null) {
            map.put(input, map.getOrDefault(input, 0) + 1);
            total++;
        }

        for (Map.Entry<String, Integer> entry : map.entrySet()) {
            double ratio = entry.getValue() * 100.0 / total;
            bw.write(entry.getKey() + String.format(" %.4f", ratio) + "\n");
        }

        bw.flush();
    }

}

 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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));

        Map<String, Integer> map = new HashMap<>();
        int total = 0;

        String input;
        while ((input = br.readLine()) != null) {
            map.put(input, map.getOrDefault(input, 0) + 1);
            total++;
        }

        List<String> list = new ArrayList<>(map.keySet());
        Collections.sort(list);

        for (String key : list) {
            double ratio = (double) map.get(key) * 100 / total;
            bw.write(key + String.format(" %.4f", ratio) + "\n");
        }

        bw.flush();
    }

}