uploaded at 2022. 12. 28. 오후 6:58:48

programmers/타겟 넘버/solution.java

@@ -0,0 +1,23 @@
+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/43165
+
+import java.util.List;
+import java.util.ArrayList;
+class Solution {
+    
+    public int solution(int[] numbers, int target) {
+        int answer = 0;
+        List<Integer> leaves = List.of(0);
+        for(int num : numbers){
+            List<Integer> tmp = new ArrayList<>();
+            for(int parent : leaves){
+                tmp.add(parent + num);
+                tmp.add(parent - num);
+            }
+            leaves = tmp;
+        }
+        for(int leaf : leaves){
+            if(leaf==target) answer ++;
+        }
+        return answer;
+    }
+}