백준[Java] 10807번 개수 세기

https://www.acmicpc.net/problem/10807

10807번: 개수 세기

문제풀이 1

import java.util.Scanner;
public class _10807_1 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        int[] arr = new int[N];
        int count = 0;

        for (int i = 0; i < N; i++) {
            arr[i] = sc.nextInt();
        }

        int find = sc.nextInt();

        for (int i = 0; i < arr.length; i++) {
            if (find == arr[i])
                count += 1;
        }
        System.out.println(count);
    }
}

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문제풀이 2

 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class _10807_2 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

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

        StringTokenizer st = new StringTokenizer(br.readLine());

        for (int i = 0; i <arr.length; i++) {
            arr[i] = Integer.parseInt(st.nextToken());
        }

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

        int count = 0;
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] == find)
                count++;
        }
        System.out.println(count);
        br.close();
    }
}

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문제풀이 3

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

public class _10807_3 {
    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());
        int[] arr = new int[N];

        StringTokenizer st = new StringTokenizer(br.readLine());

        for (int i = 0; i <arr.length; i++) {
            arr[i] = Integer.parseInt(st.nextToken());
        }

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

        int count = 0;
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] == find)
                count++;
        }
        bw.write(count + "\n"); // 여기서 "\n"을 안해주면 오류가 나는데 왜인지 모르겠음
        bw.flush();
        bw.close();
        br.close();
    }
}

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