Update day 14 solution

day-14/day-14.py

@@ -12,10 +12,8 @@ def solve(input, part, num_cycles):
     for i in range(len(template) - 1):
         counts[template[i: i + 2]] += 1
     for _ in range(num_cycles):
-        tmp_cnts = counts.copy()
-        for k in tmp_cnts:
+        for k, c in counts.copy().items():
             if k in rules:
-                c = tmp_cnts[k]
                 counts[k] -= c
                 counts[k[0] + rules[k]] += c
                 counts[rules[k] + k[1]] += c