[Java/프로그래머스/DFS] 타겟 넘버

문제

programmers.co.kr/learn/courses/30/lessons/43165

코딩테스트 연습 - 타겟 넘버

 

코드

class Solution {
    static int answer;
    
    public void dfs(int index, int result, int[] numbers, int target){
        if(index == numbers.length){
        	if(result==target)
            	answer++;
            return;
        }else{
            dfs(index+1, result+numbers[index], numbers,target);
            dfs(index+1, result-numbers[index], numbers,target);
        }
    }
    public int solution(int[] numbers, int target) {
        answer = 0;
        dfs(0, 0, numbers, target);
        return answer;
    }
}