Java Study : 6주차 - 백준 문제풀이

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

2908번: 상수

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int x = in.nextInt();
        int y = in.nextInt();
        
        int xx = flip(x);
        int yy = flip(y);
        
        System.out.println(xx > yy ? xx : yy);
    }
    
    public static int flip(int num){
            int result=0;
            while(num!=0){
                result= result * 10 + num % 10;
                num /= 10;
            }
            return result;
        }
}

 

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

5622번: 다이얼

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String x = in.nextLine();
        int time = 0;

        for(int i=0; i<x.length(); i++) {
            if(x.charAt(i) < 83 ) {
                time += (((x.charAt(i) - 62) / 3) + 2);
            }
            else if(x.charAt(i) >= 83 && x.charAt(i) < 90){
                time += (((x.charAt(i) - 63) / 3) + 2);
            }
            else {
                time += 10;
            }
        }
        System.out.println(time);
    }
}

 

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);
        String x = in.nextLine();
        int count = 0;
        int arr[] = new int[26];

        for(int i=0; i<26; i++) {
            arr[i] = -1;
        }

        for(int i=0; i< x.length(); i++) {
            if(arr[x.charAt(i)-97] == -1) {
                arr[x.charAt(i)-97] = count;
            }
            count++;
        }

        for(int i=0; i<26; i++) {
            System.out.print(arr[i] + " ");
        }
    }
}