Add coding exercises for Facebook interviews

Add attempts at solving coding problems to Briefcase.

scratch/facebook/inflight-entertainment.py

@@ -0,0 +1,29 @@
+from random import choice
+from utils import init_table
+
+def get(movie, seeking):
+    return any([movie in xs for xs in seeking.values()])
+
+def set_complement(movie, seeking):
+    for duration, xs in seeking.items():
+        seeking[duration].add(duration - movie)
+
+def choose_movies(tolerance, duration, movies):
+    seeking = {duration + i: set() for i in range(-1 * tolerance, tolerance + 1)}
+    for movie in movies:
+        if get(movie, seeking):
+            return movie, duration - movie
+        else:
+            set_complement(movie, seeking)
+    return None
+
+tolerance = 20
+duration = choice([1, 2, 3]) * choice([1, 2]) * choice([15, 30, 45])
+movies = [choice([1, 2, 3]) * choice([15, 30, 45]) for _ in range(10)]
+print("Seeking two movies for a duration of [{}, {}] minutes".format(duration - tolerance, duration + tolerance))
+print(movies)
+result = choose_movies(tolerance, duration, movies)
+if result:
+    print("{} + {} = {}".format(result[0], result[1], duration))
+else:
+    print(":( We're sad because we couldn't find two movies for a {} minute flight".format(duration))