diff --git "a/khj20006/202504/10 BOJ P4 \352\264\221\352\263\240.md" "b/khj20006/202504/10 BOJ P4 \352\264\221\352\263\240.md"
new file mode 100644
index 00000000..2a471858
--- /dev/null
+++ "b/khj20006/202504/10 BOJ P4 \352\264\221\352\263\240.md"	
@@ -0,0 +1,61 @@
+```java
+
+import java.util.*;
+import java.io.*;
+
+class Main {
+	
+	// IO field
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	static StringTokenizer st = new StringTokenizer("");
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static String nextToken() throws Exception {
+		while(!st.hasMoreTokens()) nextLine();
+		return st.nextToken();
+	}
+	static int nextInt() throws Exception { return Integer.parseInt(nextToken()); }
+	static long nextLong() throws Exception { return Long.parseLong(nextToken()); }
+	static double nextDouble() throws Exception { return Double.parseDouble(nextToken()); }
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+	
+	// Additional field
+	
+	static int L;
+	static char[] A;
+	static int[] X;
+	
+	public static void main(String[] args) throws Exception {
+		
+		ready();
+		solve();
+	
+		bwEnd();
+		
+	}
+	
+	static void ready() throws Exception{
+		
+		L = nextInt();
+		X = new int[L];
+		A = br.readLine().toCharArray();
+		
+	}
+	
+	static void solve() throws Exception{
+		
+		X[0] = 0;
+		for(int i=1;i<L;i++) {
+			int j = X[i-1];
+			while(j>0 && A[j] != A[i]) j = X[j-1];
+			X[i] = j + (A[j] == A[i] ? 1 : 0);
+		}
+		
+		bw.write((L-X[L-1]) + "\n");
+		
+	}
+	
+}
+
+```