[20250713] BOJ / G3 / 세 용액 / 신동윤

03do-new30/202507/13 BOJ G3 세 용액.md

@@ -0,0 +1,50 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static int N;
+    static long[] arr, answer;
+    static long minAbs;
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        N = Integer.parseInt(br.readLine());
+        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);
+        minAbs = 3_000_000_000L;
+        for (int startIdx = 0; startIdx < N-2; startIdx++) {
+            twoPointer(startIdx);
+        }
+        for (long num : answer) {
+            System.out.print(num + " ");
+        }
+        br.close();
+    }
+
+    private static void twoPointer(int startIdx) {
+        int leftIdx = startIdx + 1;
+        int rightIdx = N-1;
+        while (leftIdx < rightIdx) {
+            long currentVal = arr[startIdx] + arr[leftIdx] + arr[rightIdx];
+            long currentAbs = Math.abs(currentVal);
+            if (currentAbs < minAbs) {
+                minAbs = currentAbs;
+                answer = new long[] {arr[startIdx], arr[leftIdx], arr[rightIdx]};
+            }
+            if (currentVal < 0) {
+                leftIdx++;
+            } else if (currentVal > 0) {
+                rightIdx--;
+            } else {
+                break;
+            }
+        }
+    }
+}
+
+```