빠른 A+B (15552)

Java 11

  • BufferedWriter 사용.
import java.io.*;
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));

        int n = Integer.parseInt(br.readLine());

        StringTokenizer st;

        for (int i=0; i<n; i++) {
            st = new StringTokenizer(br.readLine(), " ");
            bw.write((Integer.parseInt(st.nextToken())+Integer.parseInt(st.nextToken())) + "\n");
        }
        br.close();

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

  • StringBuilder 사용.
import java.io.*;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) throws IOException {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int n = Integer.parseInt(br.readLine());

        StringTokenizer st;
        StringBuilder sb = new StringBuilder();

        for (int i=0; i<n; i++) {
            st = new StringTokenizer(br.readLine(), " ");
            sb.append(Integer.parseInt(st.nextToken())+Integer.parseInt(st.nextToken()));
            sb.append("\n");
        }
        br.close();

        System.out.println(sb);
    }
}

BufferedWriter와 StringBuilder 비교.

100만개 정도까지는 StringBuilder 가 아주 조금 더 빠르다.
✔️ 데이터 양이 커지면 커질 수록 BufferedWriter 가 더 빠르다.

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