[20250731] BOJ / G5 / 두 수의 합 / 설진영

Author: Seol-JY

Seol-JY/202507/31 BOJ G5 두 수의 합.md

@@ -0,0 +1,54 @@
+```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));
+        StringBuilder sb = new StringBuilder();
+        
+        int t = Integer.parseInt(br.readLine());
+        
+        for (int tc = 0; tc < t; tc++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            int n = Integer.parseInt(st.nextToken());
+            int k = Integer.parseInt(st.nextToken());
+            
+            int[] 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 left = 0;
+            int right = n - 1;
+            int minDiff = Integer.MAX_VALUE;
+            int count = 0;
+            
+            while (left < right) {
+                int sum = arr[left] + arr[right];
+                int diff = Math.abs(sum - k);
+                
+                if (diff < minDiff) {
+                    minDiff = diff;
+                    count = 1;
+                } else if (diff == minDiff) {
+                    count++;
+                }
+                
+                if (sum < k) {
+                    left++;
+                } else {
+                    right--;
+                }
+            }
+            
+            sb.append(count).append('\n');
+        }
+        
+        System.out.print(sb);
+    }
+}
+```