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

1 files changed, 38 insertions, 0 deletions

diff --git a/users/wpcarro/scratch/data_structures_and_algorithms/trickling-water.py b/users/wpcarro/scratch/data_structures_and_algorithms/trickling-water.py
new file mode 100644
index 0000000000..45621990ec
--- /dev/null
+++ b/users/wpcarro/scratch/data_structures_and_algorithms/trickling-water.py
@@ -0,0 +1,38 @@
+class Node(object):
+    def __init__(self, value, children=[]):
+        self.value = value
+        self.children = children
+
+
+################################################################################
+# Solution
+################################################################################
+def trip_time(node):
+    s = []
+    result = 0
+    s.append((node.value, node))
+    while s:
+        p, node = s.pop()
+        if not node.children:
+            result = max(result, p)
+        for x in node.children:
+            s.append((p + x.value, x))
+    return result
+
+
+################################################################################
+# Tests
+################################################################################
+tree = Node(
+    0,
+    children=[
+        Node(5, children=[Node(6)]),
+        Node(2, children=[
+            Node(6),
+            Node(10),
+        ]),
+        Node(3, children=[Node(2, children=[Node(11)])]),
+    ])
+
+assert trip_time(tree) == 16
+print("Tests pass!")