[20250806] BOJ / G5 / 감소하는 수 / 이종환

0224LJH/6 BOJ 감소하는 수.md

@@ -0,0 +1,52 @@
+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+
+
+public class Main {
+
+    static int target,idx;
+    static long[] decreasingNum;
+
+
+    public static void main(String[] args) throws IOException {
+        init();
+        process();
+        print();
+    }
+
+    private static void init() throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        target = Integer.parseInt(br.readLine());
+        decreasingNum = new long[1000001];
+        Arrays.fill(decreasingNum, -1);
+        idx = 0;
+    }
+
+    private static void process() throws IOException {
+        for (int i = 1; i <= 10; i++){
+            findNum(i-1,0,10);
+        }
+
+    }
+
+    private static void findNum(int curPos, long curNum,int limit) {
+        if (curPos == -1){
+            decreasingNum[idx++] = curNum;
+        }
+
+        for (int i = 0; i < limit; i++){
+            long tempNum = (long) (curNum + Math.pow(10,curPos) * i);
+            findNum(curPos-1,tempNum,i);
+
+        }
+    }
+
+
+    private static void print() {
+        System.out.println(decreasingNum[target]);
+    }
+}
+```