Add coding exercises for Facebook interviews

Add attempts at solving coding problems to Briefcase.

1 files changed, 26 insertions, 0 deletions

diff --git a/scratch/facebook/kth-to-last-node-in-singly-linked-list.py b/scratch/facebook/kth-to-last-node-in-singly-linked-list.py
new file mode 100644
index 000000000000..dd258d924d10
--- /dev/null
+++ b/scratch/facebook/kth-to-last-node-in-singly-linked-list.py
@@ -0,0 +1,26 @@
+from linked_list import Node, from_list
+
+def kth_to_last_node(k, node):
+    one = node
+    two = node
+    for _ in range(k - 1):
+        if not one:
+            return None
+        one = one.next
+    while one.next:
+        one = one.next
+        two = two.next
+    return two.value
+
+
+xs = from_list(["Angel Food", "Bundt", "Cheese", "Devil's Food", "Eccles"])
+result = kth_to_last_node(2, xs)
+print(result)
+assert result == "Devil's Food"
+print("Success!")
+
+xs = from_list(["Angel Food", "Bundt"])
+result = kth_to_last_node(30, xs)
+print(result)
+assert result is None
+print("Success!")