From 35f4d64ecd4a2fcd23386f92b2b6d3d63bb248e8 Mon Sep 17 00:00:00 2001
From: lkhyun <102892446+lkhyun@users.noreply.github.com>
Date: Sun, 28 Sep 2025 11:34:54 +0900
Subject: [PATCH] =?UTF-8?q?[20250928]=20BOJ=20/=20G4=20/=20=EC=A2=8B?=
 =?UTF-8?q?=EB=8B=A4=20/=20=EC=9D=B4=EA=B0=95=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../28 BOJ G4 \354\242\213\353\213\244.md"    | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 "lkhyun/202509/28 BOJ G4 \354\242\213\353\213\244.md"

diff --git "a/lkhyun/202509/28 BOJ G4 \354\242\213\353\213\244.md" "b/lkhyun/202509/28 BOJ G4 \354\242\213\353\213\244.md"
new file mode 100644
index 00000000..6d384b89
--- /dev/null
+++ "b/lkhyun/202509/28 BOJ G4 \354\242\213\353\213\244.md"	
@@ -0,0 +1,50 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main{
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static StringBuilder sb = new StringBuilder();
+    static int N;
+    static int[] arr;
+
+    public static void main(String[] args) throws Exception {
+        N = Integer.parseInt(br.readLine());
+        arr = new int[N];
+
+        st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < N; i++) {
+            arr[i] = Integer.parseInt(st.nextToken());
+        }
+        Arrays.sort(arr);
+
+        int cnt = 0;
+        for (int i = 0; i < N; i++) {
+            int left = 0;
+            int right = N-1;
+            while(left < right){
+                if(left == i){
+                    left++;
+                    continue;
+                }
+                if(right == i){
+                    right--;
+                    continue;
+                }
+                if(arr[i] < arr[left] + arr[right]){
+                    right--;
+                }else if(arr[i] > arr[left] + arr[right]){
+                    left++;
+                }else{
+                    cnt++;
+                    break;
+                }
+            }   
+        }
+        bw.write(cnt+"");
+        bw.close();
+    }
+}
+```