diff --git a/Basic_Of_Algorithm/src/programmers_level_2/no_13.java b/Basic_Of_Algorithm/src/programmers_level_2/no_13.java
new file mode 100644
index 0000000..ef45464
--- /dev/null
+++ b/Basic_Of_Algorithm/src/programmers_level_2/no_13.java
@@ -0,0 +1,54 @@
+package programmers_level_2;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+public class no_13 {
+
+	
+	public static void main(String[] args) {
+		
+String [] record = {"Enter uid1234 Muzi", "Enter uid4567 Prodo","Leave uid1234","Enter uid1234 Prodo","Change uid4567 Ryan"};
+		
+		HashMap<String,String> map = new HashMap<>();
+		ArrayList<String> answerList = new ArrayList<>();
+		
+		for(String str : record) {
+			
+			String temp[] = str.split(" ");
+			String action = temp[0];
+			String id = temp[1];
+			
+			if(action.equals("Leave")) continue;
+			
+			String nick = temp[2];
+			
+			map.put(id, nick);
+			
+		}
+		
+		for(String str : record) {
+			
+			String temp[] = str.split(" ");
+			String action = temp[0];
+			String id = temp[1];
+			
+			if(action.equals("Change")) continue;
+			
+			String nick = map.get(id);
+			String ans = nick + "님이 " + (action.equals("Enter") ? "들어왔습니다." : "나갔습니다.");
+			
+			answerList.add(ans);
+		
+		}
+		
+		
+		String[]answer = new String[answerList.size()];
+		
+		for(int i = 0 ; i< answerList.size();i++) answer[i] = answerList.get(i);
+		
+		for(String str : answer)System.out.println(str);
+		
+		
+	}
+}
diff --git a/Basic_Of_Algorithm/src/programmers_level_2/no_14.java b/Basic_Of_Algorithm/src/programmers_level_2/no_14.java
new file mode 100644
index 0000000..a6353ea
--- /dev/null
+++ b/Basic_Of_Algorithm/src/programmers_level_2/no_14.java
@@ -0,0 +1,70 @@
+package programmers_level_2;
+
+public class no_14 {
+
+	public static void main(String[] args) {
+		
+		String p = "()))((()";
+		
+		System.out.println(solution(p));
+		
+	}
+	
+	static String solution(String p) {
+		
+		String answer = change(p);
+		
+		
+		
+		return answer;
+		
+		
+	}
+	static String change(String w) {
+		
+		if(w.isEmpty())return "";
+		
+		String u = "";
+		String v = "";
+		
+		int l = 0;
+		int r = 0;
+		int i;
+		for(i=0;i<w.length();i++) {
+			
+			if(w.charAt(i)==')') l++;
+			else r++;
+			
+			if(l==r) break;
+			
+		}
+		
+		u = w.substring(0,i+1);
+		v = w.substring(i+1,w.length());
+		
+		if(isRight(u)) {
+			u = u + change(v);
+		}else {
+			String newU = "(" + change(v) + ")";
+			u = u.substring(1,u.length()-1);
+			u = u.replaceAll("\\(", "\\.");
+			u = u.replaceAll("\\)", "\\(");
+			u = u.replaceAll("\\.", "\\)");
+			newU += u;
+			u = newU;
+		}
+		
+		
+		return u;
+		
+		
+	}
+	
+	static boolean isRight(String u) {
+		
+		if(u.charAt(0)==')') return false;
+		return true;
+		
+	}
+	
+}