[프로그래머스] Lv.1 없는 숫자 더하기

https://school.programmers.co.kr/learn/courses/30/lessons/86051?language=java

프로그래머스

 

 

class Solution {
    public int solution(int[] numbers) {
        int answer = 0;
        boolean[] visited = new boolean[10];
        for(int num : numbers) {
            visited[num] = true;
        }
        
        for (int i = 0; i < visited.length; i++){
            if (!visited[i]) answer += i;
        }
        return answer;
    }
}