[20250714] BOJ / G5 / 감소하는 수 / 김수연

suyeun84/202507/14 BOJ G5 감소하는 수.md

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+ ```java
+import java.util.*;
+import java.io.*;
+
+public class boj1038 {
+    static List<Long> arr = new ArrayList<>();
+
+    public static void main(String[] args) throws Exception{
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int N = Integer.parseInt(br.readLine());
+
+        if(N <= 10) System.out.println(N);
+        else{
+            for(int i = 0; i < 10; i++) set(i, 1);
+            if(N >= arr.size()) System.out.println(-1);
+            else{
+                Collections.sort(arr);
+                System.out.println(arr.get(N));
+            }
+        }
+    }
+
+    static void set(long num, int val){
+        if(val > 10) return;
+        arr.add(num);
+        for(int i = 0; i < num % 10; i++){
+            set((num * 10) + i, val + 1);
+        }
+    }
+}
+```