[프로그래머스/자바] 글자 지우기

class Solution {
    public String solution(String my_string, int[] indices) {
        StringBuilder sb = new StringBuilder();
        
        int[] flag = new int[my_string.length()];
        
        for (int i : indices) {
            flag[i] = 1;
        }
        
        for (int i = 0; i < flag.length; i++) {
            if (flag[i] == 0) sb.append(my_string.charAt(i));
        }
        
        return sb.toString();
    }
}