[20260204] BOJ / G5 / 0 만들기 / 이준희

JHLEE325/202602/04 BOJ G5 0 만들기.md

@@ -0,0 +1,52 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    static StringBuilder sb = new StringBuilder();
+    static int N;
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int T = Integer.parseInt(br.readLine());
+
+        for (int t = 0; t < T; t++) {
+            N = Integer.parseInt(br.readLine());
+            bt(1, "1");
+            sb.append("\n");
+        }
+        System.out.print(sb.toString());
+    }
+
+    static void bt(int num, String str) {
+        if (num == N) {
+            if (calculate(str) == 0) {
+                sb.append(str).append("\n");
+            }
+            return;
+        }
+
+        int nextNum = num + 1;
+        bt(nextNum, str + " " + nextNum);
+        bt(nextNum, str + "+" + nextNum);
+        bt(nextNum, str + "-" + nextNum);
+    }
+
+    static int calculate(String str) {
+        String replaced = str.replaceAll(" ", "");
+
+        StringTokenizer st = new StringTokenizer(replaced, "+|-", true);
+
+        int result = Integer.parseInt(st.nextToken());
+        while (st.hasMoreTokens()) {
+            String op = st.nextToken();
+            int next = Integer.parseInt(st.nextToken());
+
+            if (op.equals("+")) result += next;
+            else result -= next;
+        }
+        return result;
+    }
+}
+```