[20250918] BOJ / G5 / CCW / 한종욱

Author: Ukj0ng

Ukj0ng/202509/18 BOJ G5 CCW.md

@@ -0,0 +1,53 @@
+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static int[][] points;
+    private static int[] vector1, vector2;
+
+    public static void main(String[] args) throws IOException {
+        init();
+
+        int answer = ccw();
+
+        bw.write(answer + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        points = new int[3][2];
+
+        for (int i = 0; i < 3; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            points[i][0] = Integer.parseInt(st.nextToken());
+            points[i][1] = Integer.parseInt(st.nextToken());
+        }
+
+        vector1 = new int[2];
+        vector2 = new int[2];
+
+        vector1[0] = points[1][0] - points[0][0];
+        vector1[1] = points[1][1] - points[0][1];
+
+        vector2[0] = points[2][0] - points[1][0];
+        vector2[1] = points[2][1] - points[1][1];
+    }
+
+    private static int ccw() {
+        int crossProduct = vector1[0] * vector2[1] - vector1[1] * vector2[0];
+
+        if (crossProduct > 0) {
+            return 1;
+        } else if (crossProduct < 0) {
+            return -1;
+        } else {
+            return 0;
+        }
+    }
+}
+```