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authorVincent Ambo <mail@tazj.in>2021-12-13T22·51+0300
committerVincent Ambo <mail@tazj.in>2021-12-13T23·15+0300
commit019f8fd2113df4c5247c3969c60fd4f0e08f91f7 (patch)
tree76a857f61aa88f62a30e854651e8439db77fd0ea /users/wpcarro/scratch/facebook/kth-to-last-node-in-singly-linked-list.py
parent464bbcb15c09813172c79820bcf526bb10cf4208 (diff)
parent6123e976928ca3d8d93f0b2006b10b5f659eb74d (diff)
subtree(users/wpcarro): docking briefcase at '24f5a642' r/3226
git-subtree-dir: users/wpcarro
git-subtree-mainline: 464bbcb15c09813172c79820bcf526bb10cf4208
git-subtree-split: 24f5a642af3aa1627bbff977f0a101907a02c69f
Change-Id: I6105b3762b79126b3488359c95978cadb3efa789
Diffstat (limited to 'users/wpcarro/scratch/facebook/kth-to-last-node-in-singly-linked-list.py')
-rw-r--r--users/wpcarro/scratch/facebook/kth-to-last-node-in-singly-linked-list.py26
1 files changed, 26 insertions, 0 deletions
diff --git a/users/wpcarro/scratch/facebook/kth-to-last-node-in-singly-linked-list.py b/users/wpcarro/scratch/facebook/kth-to-last-node-in-singly-linked-list.py
new file mode 100644
index 000000000000..dd258d924d10
--- /dev/null
+++ b/users/wpcarro/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!")