days 7 and 8

2018/07.py

@@ -1,11 +1,82 @@
-class BuildTree:
+from collections import defaultdict
-    def __init__(self):
+import re
-        self.tree = {}
+import string
-        self.in_tree = set()
 
-    def _add_root(self, item):
-        self.tree[item] = {}
 
-    def _add_leaf(self, leaf, branch):
+def get_first(steps):
-        b = 
+    for step, deps in steps.items():
+        if len(deps) == 0:
+            return step
 
+
+with open('data/07.txt') as f:
+    regexp = re.compile('Step (.) must be finished before step (.) can begin.')
+    data = [regexp.match(line).groups() for line in f]
+
+
+requires = {}
+for before, after in data:
+    if before not in requires:
+        requires[before] = set()
+    if after not in requires:
+        requires[after] = set()
+    requires[after].add(before)
+
+workers = []
+
+
+incomplete = {s: set(d) for s, d in requires.items()}
+complete = []
+available = set()
+while len(incomplete):
+    for step, deps in incomplete.items():
+        if len(deps) == 0:
+            available.add(step)
+
+    s = sorted(available)[0]
+    complete.append(s)
+    for deps in incomplete.values():
+        if s in deps:
+            deps.remove(s)
+    available.remove(s)
+    del incomplete[s]
+
+print(f'Part 1: {"".join(complete)}\n')
+
+
+step_times = {c: 61 + i for i, c in enumerate(string.ascii_uppercase)}
+unattempted = {s: set(d) for s, d in requires.items()}
+complete = []
+available = set()
+running = set()
+workers = [(None, 0) for i in range(5)]
+time = -1
+while len(unattempted) or len(running):
+    time += 1
+    for i, (s, t) in enumerate(workers):
+        if s and (time - step_times[s] - t == 0):
+            complete.append(s)
+            running.remove(s)
+            for deps in unattempted.values():
+                if s in deps:
+                    deps.remove(s)
+            workers[i] = (None, 0)
+   
+    for step, deps in unattempted.items():
+        if len(deps) == 0:
+            available.add(step)
+
+    ordered_steps = sorted(available)
+    for i, (s, t) in enumerate(workers):
+        if s is None:
+            try:
+                new_step = ordered_steps.pop(0)
+                workers[i] = (new_step, time)
+                del unattempted[new_step]
+                available.remove(new_step)
+                running.add(new_step)
+            except IndexError:
+                pass
+
+
+print(f'Part 2: {time}\n')

2018/08.py

@@ -0,0 +1,46 @@
+with open('data/08.txt') as f:
+    data = [int(n) for n in f.read().split()]
+
+
+all_meta = []
+
+def parse(data):
+    (children, meta_count), data = data[:2], data[2:]
+    tree = {
+        'children': [],
+        'metadata': []
+    }
+    
+    for i in range(children):
+        child, data = parse(data)
+        tree['children'].append(child)
+    
+    for i in range(meta_count):
+        m = data.pop(0)
+        all_meta.append(m)
+        tree['metadata'].append(m)
+
+    return tree, data
+
+
+tree, _ = parse(data)
+
+print(f'Part 1: {sum(all_meta)}\n')
+
+
+def value(node):
+    children, metadata, = node['children'], node['metadata']
+    if len(children) == 0:
+        return sum(metadata)
+    
+    child_values = []
+    for i in metadata:
+        if i == 0:
+            continue
+        try:
+            child_values.append(value(children[i - 1]))
+        except IndexError:
+            pass
+    return sum(child_values)
+
+print(f'Part 2: {value(tree)}\n')

2018/data/07.txt

@@ -0,0 +1,101 @@
+Step T must be finished before step X can begin.
+Step G must be finished before step O can begin.
+Step X must be finished before step B can begin.
+Step I must be finished before step W can begin.
+Step N must be finished before step V can begin.
+Step K must be finished before step H can begin.
+Step S must be finished before step R can begin.
+Step P must be finished before step J can begin.
+Step L must be finished before step V can begin.
+Step D must be finished before step E can begin.
+Step J must be finished before step R can begin.
+Step U must be finished before step W can begin.
+Step M must be finished before step Q can begin.
+Step B must be finished before step F can begin.
+Step F must be finished before step E can begin.
+Step V must be finished before step Q can begin.
+Step C must be finished before step A can begin.
+Step H must be finished before step Z can begin.
+Step A must be finished before step Y can begin.
+Step O must be finished before step Y can begin.
+Step W must be finished before step Q can begin.
+Step E must be finished before step Y can begin.
+Step Y must be finished before step Z can begin.
+Step Q must be finished before step R can begin.
+Step R must be finished before step Z can begin.
+Step S must be finished before step E can begin.
+Step O must be finished before step W can begin.
+Step G must be finished before step B can begin.
+Step I must be finished before step N can begin.
+Step G must be finished before step I can begin.
+Step H must be finished before step R can begin.
+Step N must be finished before step C can begin.
+Step M must be finished before step W can begin.
+Step Y must be finished before step R can begin.
+Step T must be finished before step B can begin.
+Step G must be finished before step D can begin.
+Step J must be finished before step O can begin.
+Step I must be finished before step A can begin.
+Step J must be finished before step H can begin.
+Step T must be finished before step Y can begin.
+Step N must be finished before step H can begin.
+Step B must be finished before step V can begin.
+Step M must be finished before step R can begin.
+Step Y must be finished before step Q can begin.
+Step X must be finished before step J can begin.
+Step A must be finished before step E can begin.
+Step P must be finished before step Z can begin.
+Step P must be finished before step C can begin.
+Step N must be finished before step Q can begin.
+Step A must be finished before step O can begin.
+Step G must be finished before step X can begin.
+Step P must be finished before step U can begin.
+Step T must be finished before step S can begin.
+Step I must be finished before step V can begin.
+Step V must be finished before step H can begin.
+Step U must be finished before step F can begin.
+Step D must be finished before step Q can begin.
+Step D must be finished before step O can begin.
+Step G must be finished before step H can begin.
+Step I must be finished before step Z can begin.
+Step N must be finished before step D can begin.
+Step B must be finished before step Y can begin.
+Step J must be finished before step M can begin.
+Step V must be finished before step Y can begin.
+Step W must be finished before step Y can begin.
+Step E must be finished before step Z can begin.
+Step T must be finished before step N can begin.
+Step L must be finished before step U can begin.
+Step S must be finished before step A can begin.
+Step Q must be finished before step Z can begin.
+Step T must be finished before step F can begin.
+Step F must be finished before step Z can begin.
+Step J must be finished before step C can begin.
+Step X must be finished before step Y can begin.
+Step K must be finished before step V can begin.
+Step T must be finished before step I can begin.
+Step I must be finished before step O can begin.
+Step C must be finished before step W can begin.
+Step B must be finished before step Q can begin.
+Step W must be finished before step Z can begin.
+Step D must be finished before step H can begin.
+Step K must be finished before step A can begin.
+Step M must be finished before step E can begin.
+Step T must be finished before step U can begin.
+Step I must be finished before step J can begin.
+Step O must be finished before step Q can begin.
+Step M must be finished before step Z can begin.
+Step U must be finished before step C can begin.
+Step N must be finished before step F can begin.
+Step C must be finished before step H can begin.
+Step X must be finished before step E can begin.
+Step F must be finished before step O can begin.
+Step P must be finished before step O can begin.
+Step J must be finished before step A can begin.
+Step H must be finished before step Y can begin.
+Step A must be finished before step Q can begin.
+Step V must be finished before step Z can begin.
+Step S must be finished before step L can begin.
+Step H must be finished before step E can begin.
+Step X must be finished before step I can begin.
+Step O must be finished before step R can begin.