Merge pull request #1415 from AlgorithmWithGod/JHLEE325

[20251115] BOJ / G4 / 좋다 / 이준희

Author: ShinHeeEul

JHLEE325/202511/15 BOJ G4 좋다.md

@@ -0,0 +1,48 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int N = Integer.parseInt(br.readLine().trim());
+        long[] arr = new long[N];
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < N; i++) {
+            arr[i] = Long.parseLong(st.nextToken());
+        }
+
+        Arrays.sort(arr);
+
+        int goodCount = 0;
+        for (int k = 0; k < N; k++) {
+            long target = arr[k];
+            int left = 0;
+            int right = N - 1;
+
+            while (left < right) {
+                if (left == k) {
+                    left++;
+                    continue;
+                }
+                if (right == k) {
+                    right--;
+                    continue;
+                }
+
+                long sum = arr[left] + arr[right];
+                if (sum == target) {
+                    goodCount++;
+                    break;
+                } else if (sum < target) {
+                    left++;
+                } else {
+                    right--;
+                }
+            }
+        }
+
+        System.out.println(goodCount);
+    }
+}
+```