diff --git "a/Seol-JY/202512/12 BOJ G2 \352\274\254\354\235\270 \354\240\204\352\271\203\354\244\204.md" "b/Seol-JY/202512/12 BOJ G2 \352\274\254\354\235\270 \354\240\204\352\271\203\354\244\204.md"
new file mode 100644
index 00000000..b39a5b59
--- /dev/null
+++ "b/Seol-JY/202512/12 BOJ G2 \352\274\254\354\235\270 \354\240\204\352\271\203\354\244\204.md"	
@@ -0,0 +1,31 @@
+import java.io.*;
+import java.util.*;
+
+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().trim());
+
+        int[] arr = new int[n];
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        for (int i = 0; i < n; i++) {
+            arr[i] = Integer.parseInt(st.nextToken());
+        }
+
+        ArrayList<Integer> lis = new ArrayList<>();
+
+        for (int a : arr) {
+            int pos = Collections.binarySearch(lis, a);
+            if (pos < 0) pos = -(pos + 1);
+
+            if (pos == lis.size()) {
+                lis.add(a);
+            } else {
+                lis.set(pos, a);
+            }
+        }
+
+        System.out.println(n - lis.size());
+    }
+}