[1일 1문제] 백준 단계별로 풀어보기 8-10번, 1-2번 (1.1~1.5)

1.1

문제번호 3052

나머지

package baekjoon;

import java.util.Arrays;
import java.util.Scanner;

public class java_0101 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] A = new int[10];
		int[] B = new int[10];
		
		for (int i = 0; i < 10; i++) {
			A[i] = sc.nextInt();
			B[i] = A[i] % 42;
		}
		
		int[] count = Arrays.stream(B).distinct().toArray();
		System.out.println(count.length);
	}
}

 

1.2

문제번호 10811

바구니 뒤집기

package baekjoon;

import java.util.Arrays;
import java.util.Scanner;

public class java_0102 {	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int M = sc.nextInt();
		
		int[] a = new int[N];
		for(int i = 0; i < N; i++) {
			a[i] = i + 1;
		}
		
		for (int n = 0; n < M; n++) {
			int i = sc.nextInt() - 1;
			int j = sc.nextInt() - 1;
			
			while (i < j) {
				int temp = a[i];
				a[i++] = a[j];
				a[j--] = temp;
			}
		}
		
		for(int i=0; i<N; i++) {
			System.out.print(a[i] + " ");
		}
	}
}

 

1.3

문제번호 1546

평균

package baekjoon;

import java.util.Scanner;

public class java_0103 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
		
		double[] scores = new double[n];
		
		double max = 0;
		for (int i=0; i<n; i++) {
			scores[i] = sc.nextDouble();
			if(scores[i] > max) {
				max = scores[i];
			}
		}
		
		double sum = 0;
		
		for (int i=0; i<n; i++) {
			sum += (scores[i] / max) * 100;
		}
		System.out.println(sum/n);
	}
}

 

1.4

문제번호 27866

문자와 문자열

package baekjoon;

import java.util.Scanner;

public class java_0104 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		String S = sc.next();
		int i = sc.nextInt();
		
		System.out.println(S.substring(i-1, i));
	}
}

 

1.5

문제번호 2743

단어 길이 재기

package baekjoon;

import java.util.Scanner;

public class java_0105 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		String S = sc.next();
		System.out.println(S.length());
	}
}