백준 10809번: 알파벳 찾기

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

import java.io.BufferedReader;
import java.io.InputStreamReader;
 
public class Main {
    
    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String input = reader.readLine();
        
        int[] arr = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,};
        for(int i=0 ; i<input.length() ; i++){
            int value = input.charAt(i) - 97;
            if(arr[value] == -1)
                arr[value] = i;
        }
        
        StringBuilder builder = new StringBuilder();
        for(int i=0 ; i<arr.length ; i++)
            builder.append(arr[i]).append(" ");
        
        System.out.println(builder);
    }
}