From de707b91aeb9f1e36f8f35e47197fb40aad90521 Mon Sep 17 00:00:00 2001
From: lkhyun <102892446+lkhyun@users.noreply.github.com>
Date: Mon, 16 Jun 2025 16:38:39 +0900
Subject: [PATCH] =?UTF-8?q?[20250616]=20BOJ=20/=20G2=20/=20=ED=95=A9?=
 =?UTF-8?q?=EC=9D=B4=200=EC=9D=B8=20=EB=84=A4=20=EC=A0=95=EC=88=98=20/=20?=
 =?UTF-8?q?=EC=9D=B4=EA=B0=95=ED=98=84?=
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---
 ... \353\204\244 \354\240\225\354\210\230.md" | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 "lkhyun/202506/16 BOJ G2 \355\225\251\354\235\264 0\354\235\270 \353\204\244 \354\240\225\354\210\230.md"

diff --git "a/lkhyun/202506/16 BOJ G2 \355\225\251\354\235\264 0\354\235\270 \353\204\244 \354\240\225\354\210\230.md" "b/lkhyun/202506/16 BOJ G2 \355\225\251\354\235\264 0\354\235\270 \353\204\244 \354\240\225\354\210\230.md"
new file mode 100644
index 00000000..6c6e067e
--- /dev/null
+++ "b/lkhyun/202506/16 BOJ G2 \355\225\251\354\235\264 0\354\235\270 \353\204\244 \354\240\225\354\210\230.md"	
@@ -0,0 +1,69 @@
+```java
+import java.io.*;
+import java.util.*;
+
+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 int N;
+    static int[] A;
+    static int[] B;
+    static int[] C;
+    static int[] D;
+    static int[] AB;
+    static int[] CD;
+    static long answer = 0;
+
+    public static void main(String[] args) throws IOException {
+        N = Integer.parseInt(br.readLine());
+        A = new int[N];
+        B = new int[N];
+        C = new int[N];
+        D = new int[N];
+        for (int i = 0; i < N; i++) {
+            st = new StringTokenizer(br.readLine());
+            A[i] = Integer.parseInt(st.nextToken());
+            B[i] = Integer.parseInt(st.nextToken());
+            C[i] = Integer.parseInt(st.nextToken());
+            D[i] = Integer.parseInt(st.nextToken());
+        }
+
+        AB = new int[N*N];
+        CD = new int[N*N];
+        for (int i = 0; i < N; i++) {
+            for (int j = 0; j < N; j++) {
+                AB[i*N+j] = A[i] + B[j];
+                CD[i*N+j] = C[i] + D[j];
+            }
+        }
+        Arrays.sort(AB);
+        Arrays.sort(CD);
+
+        int left = 0, right = N*N-1;
+        while (left < N*N && right >= 0) {
+            if(AB[left] + CD[right] == 0){
+                int leftCnt = 1;
+                while(left + 1 < N*N && AB[left+1] == AB[left]){
+                    left++;
+                    leftCnt++;
+                }
+                int rightCnt = 1;
+                while(right - 1 >= 0 && CD[right-1] == CD[right]){
+                    right--;
+                    rightCnt++;
+                }
+                answer += (long)leftCnt * rightCnt;
+                left++;
+                right--;
+            }else if(AB[left] + CD[right] < 0){
+                left++;
+            }else{
+                right--;
+            }
+        }
+        bw.write(answer + "\n");
+        bw.close();
+    }
+}
+```