[JAVA] 백준 기초문제 5

문제 상수 2908번

https://www.acmicpc.net/problem/2908

2908번: 상수

 

코드

import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args) {
 
		Scanner in = new Scanner(System.in);
        
		int A = in.nextInt();
		int B = in.nextInt();
        
        in.close();
        
		A = Integer.parseInt(new StringBuilder().append(A).reverse().toString());
		B = Integer.parseInt(new StringBuilder().append(B).reverse().toString());
		
		System.out.print(A > B ? A : B);
	
	}
}

 

문제 5622 다이얼

https://www.acmicpc.net/problem/5622

5622번: 다이얼

 

코드

import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
    
		Scanner in = new Scanner(System.in);
		
		String s = in.nextLine();
 
		int count = 0;
		int k = s.length();
        
		for(int i = 0; i < k; i++) {
        
			switch(s.charAt(i)) {
            
			case 'A' : case 'B': case 'C' : 
				count += 3;
				break;
                
			case 'D' : case 'E': case 'F' :
				count += 4; 
				break;
                
			case 'G' : case 'H': case 'I' :
				count += 5; 
				break;
                
			case 'J' : case 'K': case 'L' : 
				count += 6;
				break;
                
			case 'M' : case 'N': case 'O' :
				count += 7;
				break;
                
			case 'P' : case 'Q': case 'R' : case 'S' : 
				count += 8; 
				break;
                
			case 'T' : case 'U': case 'V' : 
				count += 9;
				break;
                
			case 'W' : case 'X': case 'Y' : case 'Z' : 
				count += 10;
				break;
			}
		}		
		System.out.print(count);
	}
}

 

문제 알파벳 찾기 10809 

https://www.acmicpc.net/problem/10809

10809번: 알파벳 찾기

import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
 
 
		int[] arr = new int[26];
		
		for(int i = 0; i < arr.length; i++) {
			arr[i] = -1;
		}
 
		String S = in.nextLine();
 
		for(int i = 0; i < S.length(); i++) {
			char ch = S.charAt(i);
    
			if(arr[ch - 'a'] == -1) {	
				arr[ch - 'a'] = i;
			}
		}
 
		for(int val : arr) {	
			System.out.print(val + " ");
		}
	}
}