[20260107] BOJ / G5 / 감소하는 수 / 이강현

Author: lkhyun

lkhyun/202601/07 BOJ G5 감소하는 수.md

@@ -0,0 +1,28 @@
+```java
+
+import java.util.*;
+import java.io.*;
+
+public class Main {
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int N = Integer.parseInt(br.readLine());
+
+        List<Long> list = new ArrayList<>();
+
+        for (int i = 1; i < 1024; i++) {
+            long num = 0;
+            for (int j = 9; j >= 0; j--) {
+                if ((i & (1 << j)) != 0) {
+                    num = num * 10 + j;
+                }
+            }
+            list.add(num);
+        }
+
+        Collections.sort(list);
+
+        System.out.println(N >= list.size() ? -1 : list.get(N));
+    }
+}
+```