1 files changed, 91 insertions, 0 deletions
diff --git a/solutions/py/06.py b/solutions/py/06.py
new file mode 100644
index 0000000..660093c
--- /dev/null
+++ b/solutions/py/06.py
@@ -0,0 +1,91 @@
+from typing import Iterable
+import sys
+
+def flatten(l):
+    # https://stackoverflow.com/a/40857703
+    for v in l:
+        if isinstance(v, Iterable):
+            yield from flatten(v)
+        else:
+            yield v
+
+class Tree(object):
+    # https://stackoverflow.com/a/28015122
+    def __init__(self, name='root', children=None):
+        self.name = name
+        self.children = []
+        self.parent = None
+        if children is not None:
+            for child in children:
+                self.add_child(child)
+    def add_child(self, node):
+        self.children.append(node)
+        node.parent = self
+
+    def __eq__(self, other):
+        if isinstance(other, Tree):
+            return self.name == other.name
+        return False
+    def parents(self):
+        if self.parent == None:
+            return []
+        return [self.parent, self.parent.parents()]
+
+
+if __name__ == "__main__":
+    lines = open("../input/06", "r").readlines()
+
+    trees = {}
+    seen = set()  # seen trees. contains only IDs
+    leafs = {}
+
+    for orbit in lines:
+        orbit = orbit.rstrip().split(")")
+        #print(orbit)
+        if not orbit[0] in seen:
+            trees[orbit[0]] = Tree(orbit[0])
+            seen.add(orbit[0])
+
+    # hook up each child to its parent (since every parent now exists)
+    for orbit in lines:
+        orbit = orbit.rstrip().split(")")
+        if orbit[1] in seen:
+            trees[orbit[0]].add_child(trees[orbit[1]])
+        else:
+            leafs[orbit[1]] = Tree(orbit[1])
+            trees[orbit[0]].add_child(leafs[orbit[1]])
+    for k in trees:
+        pass
+        #print(trees[k], trees[k].children)
+
+    trees.update(leafs)
+
+    sum_depths = 0
+    depth = 0
+    depths = {}
+    def count_children(tree, depth):
+        global sum_depths  # fusk-rekursion? ville bara att det skulle fungera
+        sum_depths += depth
+        depths[tree.name] = depth
+        for child in tree.children:
+            count_children(child, depth+1)
+    count_children(trees["COM"], 0) 
+    print("1:", sum_depths)
+
+    parents = {}
+    for tree in trees:
+        parents[tree] = list(flatten(trees[tree].parents()))
+
+    # find common parent and distance to it
+    src = trees["YOU"].parent.name
+    tar = trees["SAN"].parent.name
+    src_dist = 0
+    for src_parent in parents[src]:
+        src_dist += 1
+        tar_dist = 0
+        for tar_parent in parents[tar]:
+            tar_dist += 1
+            if src_parent == tar_parent:
+                print("2:", src_parent.name, src_dist, tar_dist, src_dist + tar_dist)
+                sys.exit()
+