Add coding exercises for Facebook interviews

Add attempts at solving coding problems to Briefcase.

scratch/facebook/top-scores.py

@@ -0,0 +1,20 @@
+import random
+from collections import deque
+
+def sorted(xs):
+    result = [0] * 100
+    for x in xs:
+        result[x - 1] += 1
+
+    answer = deque()
+    for i in range(len(result)):
+        x = result[i]
+        for _ in range(x):
+            answer.appendleft(i + 1)
+
+    return list(answer)
+
+scores = [random.choice(range(70, 100)) for _ in range(20)]
+print(scores)
+result = sorted(scores)
+print(result)