[JAVA] 단계별로 풀어보기 5. 1차원 배열

코드가 이게 뭐야, 나중에 다시보기

1. 10818  최소, 최대

https://www.acmicpc.net/problem/10818

10818번: 최소, 최대

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

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int[] arr =new int[Integer.parseInt(br.readLine())];
        StringTokenizer st = new StringTokenizer(br.readLine(), " ");
        
        for(int i=0 ; i<arr.length ; i++)
            arr[i] = Integer.parseInt(st.nextToken());
        
        Arrays.sort(arr);
        System.out.println(arr[0] + " " + arr[arr.length-1]);
	}
}

 

2. 2562  최댓값

https://www.acmicpc.net/problem/2562

2562번: 최댓값

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

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int max = 0;
        int index = 0;
        
        for(int i=0 ; i<9 ; i++) {
            int num = Integer.parseInt(br.readLine());
            
            if(num>max) {
                max = num;
                index = i+1;
            }
        }
        
        System.out.println(max + "\n" + index);
	}
}

3. 2577  숫자의 개수
https://www.acmicpc.net/problem/2577

2577번: 숫자의 개수

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

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int[] count = {0, 0, 0, 0 ,0, 0, 0, 0, 0, 0};
        int sum = Integer.parseInt(br.readLine())
        	*Integer.parseInt(br.readLine())
                *Integer.parseInt(br.readLine());
        
        while(sum!=0) {
            count[sum%10]++;
            sum/=10;
        }
        for(int i : count)
        	System.out.println(i);
	}
}

 

4. 3052  MODULO

https://www.acmicpc.net/problem/3052

3052번: 나머지

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

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int[] mod = new int[10];
		int result = 1;

		for (int i = 0; i < 10; i++)
			mod[i] = Integer.parseInt(br.readLine()) % 42;

		Arrays.sort(mod);
		for (int i = 1; i < 10; i++) {
			if (mod[i] != mod[i - 1])
				result++;
		}
		System.out.println(result);
	}
}

 

5. 1546  평균

https://www.acmicpc.net/problem/1546

1546번: 평균

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

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());
		int m = 0;
		double result = 0;

		String[] str = br.readLine().split(" ");

		for (int i = 0; i < n; i++) {
			if (Integer.parseInt(str[i]) > m)
				m = (int) Integer.parseInt(str[i]);
		}

		for (int i = 0; i < n; i++) {
			result = result + (Double.parseDouble(str[i])/m*100);
		}
		result = result/n;

		System.out.println((result));
	}
}

 

6. 8958  Score

https://www.acmicpc.net/problem/8958

8958번: OX퀴즈

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

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

		for (int t = Integer.parseInt(br.readLine()); t > 0; t--) {
			int sum = 0;
			int score = 0;
			String str = br.readLine();

			for (int i = 0; i < str.length(); i++) {
				if (str.charAt(i) == 'O') {
					score++;
				} else {
					score = 0;
				}
				sum += score;
			}
			sb.append(sum).append('\n');
		}
		System.out.println(sb);
	}
}

 

7. 4344  Above Average

https://www.acmicpc.net/problem/4344

4344번: 평균은 넘겠지

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

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		for (int c = Integer.parseInt(br.readLine()); c > 0; c--) {
			String[] str = (br.readLine().split(" "));
			int n = Integer.parseInt(str[0]);

			double ave = 0;
			for (int i = 1; i <= n; i++) {
				ave += Double.parseDouble(str[i]);
			}
			ave = ave / n;

			int ratio = 0;
			for (int i = 1; i <= n; i++) {
				if (Double.parseDouble(str[i]) > ave) {
					ratio++;
				}
			}
			System.out.printf("%.3f%%%n", (double) ratio / n * 100);
		}
	}
}