Solve day 7 and 8 of 2018.

2018/d7.py

@@ -1,12 +1,71 @@
-from lib import str_to_ints
+from lib import LETTERS_UPPER
 
 
 def part_1(data):
-    print(data)
+    deps = {c: [] for c in LETTERS_UPPER}
+    for line in data.splitlines():
+        fields = line.split()
+        a, b = fields[1], fields[7]
+        deps[b].append(a)
+    ready = []
+    for x, ys in deps.items():
+        if len(ys) == 0:
+            ready.append(x)
+    seq = []
+    ready = sorted(ready)
+    while ready:
+        current, ready = ready[0], ready[1:]
+        seq.append(current)
+        for x, ys in deps.items():
+            if current in ys:
+                ys.remove(current)
+                if len(ys) == 0:
+                    ready.append(x)
+                    ready = sorted(ready)
+
+    print("".join(seq))
+
+
+def score(c):
+    return 1 + ord(c) - ord("A") + 60
 
 
 def part_2(data):
-    pass
+    deps = {c: [] for c in LETTERS_UPPER}
+    for line in data.splitlines():
+        fields = line.split()
+        a, b = fields[1], fields[7]
+        deps[b].append(a)
+
+    ready = []
+    done = []
+    for x, ys in deps.items():
+        if len(ys) == 0:
+            ready.append(x)
+    workers = {}
+
+    steps = 0
+    while len(done) != 26:
+        ready = sorted(ready)
+        while len(ready) > 0 and len(workers) < 5:
+            current, ready = ready[0], ready[1:]
+            workers[current] = score(current)
+
+        to_del = []
+        for k in workers.keys():
+            workers[k] -= 1
+            if workers[k] == 0:
+                to_del.append(k)
+                done.append(k)
+                for x, ys in deps.items():
+                    if k in ys:
+                        ys.remove(k)
+                        if len(ys) == 0:
+                            ready.append(x)
+        for k in to_del:
+            del workers[k]
+        steps += 1
+    print(steps)
 
 
 def main():