[백준] 33540 Helping Out - Data Structure / Java

• 문제 링크

https://www.acmicpc.net/problem/33540

 

• 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.StringTokenizer;
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));
        StringBuilder sb = new StringBuilder();

        Map<String, Integer> map = new TreeMap<>();
        int n = Integer.parseInt(br.readLine());
        while (n-- > 0) {
            StringTokenizer st = new StringTokenizer(br.readLine());
            String k = st.nextToken();
            map.put(k, map.getOrDefault(k, 0) + Integer.parseInt(st.nextToken()));
        }

        for (String k : map.keySet()) sb.append(k).append(' ').append(map.get(k)).append('\n');

        bw.write(sb.toString());
        bw.flush();
    }

}