From 1456536a540b5f73404200b9e968ec88705bd87c Mon Sep 17 00:00:00 2001
From: lkhyun <102892446+lkhyun@users.noreply.github.com>
Date: Mon, 22 Sep 2025 21:50:37 +0900
Subject: [PATCH] =?UTF-8?q?[20250922]=20BOJ=20/=20G4=20/=20=EB=AC=B8?=
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---
 ...\234\354\212\244\355\205\234 Version 1.md" | 71 +++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 "lkhyun/202509/22 BOJ G4 \353\254\270\354\240\234 \354\266\224\354\262\234 \354\213\234\354\212\244\355\205\234 Version 1.md"

diff --git "a/lkhyun/202509/22 BOJ G4 \353\254\270\354\240\234 \354\266\224\354\262\234 \354\213\234\354\212\244\355\205\234 Version 1.md" "b/lkhyun/202509/22 BOJ G4 \353\254\270\354\240\234 \354\266\224\354\262\234 \354\213\234\354\212\244\355\205\234 Version 1.md"
new file mode 100644
index 00000000..3dc4b82d
--- /dev/null
+++ "b/lkhyun/202509/22 BOJ G4 \353\254\270\354\240\234 \354\266\224\354\262\234 \354\213\234\354\212\244\355\205\234 Version 1.md"	
@@ -0,0 +1,71 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static class Node{
+        int key,difficulty;
+
+        Node(int key, int difficulty){
+            this.key = key;
+            this.difficulty = difficulty;
+        }
+    }
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static int N,M;
+    static Map<Integer,Integer> problems = new HashMap<>();
+    static TreeSet<Node> s = new TreeSet<>((a,b) -> {
+        if(a.difficulty == b.difficulty){
+            return Integer.compare(a.key,b.key);
+        }else{
+            return Integer.compare(a.difficulty,b.difficulty);
+        }
+    });
+    
+    public static void main(String[] args) throws IOException {
+        N = Integer.parseInt(br.readLine());
+        for (int i = 0; i < N; i++) {
+            st = new StringTokenizer(br.readLine());
+            int p = Integer.parseInt(st.nextToken());
+            int l = Integer.parseInt(st.nextToken());
+            problems.put(p,l);
+            s.add(new Node(p,l));
+        }
+        
+        M = Integer.parseInt(br.readLine());
+        for (int i = 0; i < M; i++) {
+            st = new StringTokenizer(br.readLine());
+            String cmd = st.nextToken();
+            
+            if(cmd.equals("add")){
+                int p = Integer.parseInt(st.nextToken());
+                int l = Integer.parseInt(st.nextToken());
+                problems.put(p,l);
+                s.add(new Node(p,l));
+            }
+            else if(cmd.equals("recommend")){
+                int x = Integer.parseInt(st.nextToken());
+                if(x == 1){
+                    Node hard = s.last();
+                    bw.write(hard.key + "\n");
+                }
+                else{
+                    Node easy = s.first();
+                    bw.write(easy.key + "\n");
+                }
+            }
+            else if(cmd.equals("solved")){
+                int p = Integer.parseInt(st.nextToken());
+                int difficulty = problems.get(p);
+                problems.remove(p);
+                s.remove(new Node(p, difficulty));
+            }
+        }
+        
+        bw.close();
+    }
+}
+```