baekjoon 20260411

code_study/Baekjoon/java/_17387.java

@@ -0,0 +1,63 @@
+import java.util.*;
+
+class Line {
+    long x1, x2, y1, y2;
+
+    Line(long x1, long y1, long x2, long y2) {
+        if(x1 > x2 || (x1 == x2 && y1 > y2)) {
+            x1 = x1^x2;
+            x2 = x1^x2;
+            x1 = x1^x2;
+
+            y1 = y1^y2;
+            y2 = y1^y2;
+            y1 = y1^y2;
+        }
+
+        this.x1 = x1;
+        this.y1 = y1;
+        this.x2 = x2;
+        this.y2 = y2;
+    }
+
+    public int crossProduct(long x0, long y0) {
+        long val = (x0-x1)*(y2-y1) - (y0-y1)*(x2-x1);
+        return val > 0 ? 1 : val < 0 ? -1 : 0;
+    }
+} 
+
+public class _17387 {
+    static boolean comparePoint(long x1, long y1, long x2, long y2) {
+        if(x1 < x2) return true;
+        else if(x1 == x2 && y1 <= y2) return true;
+        else return false;
+    }
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        
+        long x1 = sc.nextLong(), y1 = sc.nextLong(), x2 = sc.nextLong(), y2 = sc.nextLong();
+        Line L1 = new Line(x1, y1, x2, y2);
+        long x3 = sc.nextLong(), y3 = sc.nextLong(), x4 = sc.nextLong(), y4 = sc.nextLong();
+        Line L2 = new Line(x3, y3, x4, y4);
+        
+        sc.close();
+
+        int crossABCD = L1.crossProduct(x3, y3) * L1.crossProduct(x4, y4);
+        int crossCDAB = L2.crossProduct(x1, y1) * L2.crossProduct(x2, y2);
+
+        int res = 0;
+
+        if(crossABCD == 0 && crossCDAB == 0) {
+            if(comparePoint(L1.x1, L1.y1, L2.x2, L2.y2) && comparePoint(L2.x1, L2.y1, L1.x2, L1.y2)) {
+                res = 1;
+            }
+        }
+
+        else if(crossABCD <= 0 && crossCDAB <= 0) {
+            res = 1;
+        }
+
+        System.out.println(res);
+    }
+}

code_study/Baekjoon/python/4740.py

@@ -0,0 +1 @@
+print("\n".join([s[::-1] for s in iter(input, "***")]))