1289, 7785, 11758

Author: kellsthepenguin

11758.py

@@ -0,0 +1,15 @@
+def ccw(x1, y1, x2, y2, x3, y3):
+    return (x2 - x1) * (y3 - y1) - (y2 - y1) * (x3 - x1)
+
+x1, y1 = map(int, input().split())
+x2, y2 = map(int, input().split())
+x3, y3 = map(int, input().split())
+
+result = ccw(x1, y1, x2, y2, x3, y3)
+
+if result == 0:
+    print(0)
+elif result > 0:
+    print(1)
+elif result < 0:
+    print(-1)

1269.py

@@ -0,0 +1,5 @@
+input()
+a = set(list(map(int, input().split())))
+b = set(list(map(int, input().split())))
+
+print(len(a.symmetric_difference(b)))

7785.py

@@ -0,0 +1,14 @@
+n = int(input())
+company = set()
+
+for _ in range(n):
+    name, el = input().split()
+    if el == "enter":
+        company.add(name)
+    else:
+        company.remove(name)
+
+c = reversed(sorted(list(company)))
+
+for name in c:
+    print(name)