optimized versions of day 15

interesting discoveries:
  * using a list instead of a dict made a difference, but not a lot
  * declaring the code in a function instead of as "global code" made *A
    LOT* of difference. I guess it has to do with the variables being
    global in that case

15/1.py

@@ -1,6 +1,7 @@
+def play_number_of_turns(turns):
     content = [2,0,6,12,1,3]
 
-spoken = {}
+    spoken = [0] * turns
     new_spoken = 0
     turn = 1
     for c in content:
@@ -8,14 +9,16 @@ for c in content:
         turn += 1
 
     last_turn = 0
-while turn <= 2020:
+    while turn <= turns:
         if not last_turn:
             new_spoken = 0
         else:
             new_spoken = turn - 1 - last_turn
 
-    last_turn = spoken.get(new_spoken, 0)
+        last_turn = spoken[new_spoken]
         spoken[new_spoken] = turn
         turn += 1
 
     print(new_spoken)
+
+play_number_of_turns(2020)

15/2.py

@@ -1,6 +1,7 @@
+def play_number_of_turns(turns):
     content = [2,0,6,12,1,3]
 
-spoken = {}
+    spoken = [0] * turns
     new_spoken = 0
     turn = 1
     for c in content:
@@ -8,14 +9,16 @@ for c in content:
         turn += 1
 
     last_turn = 0
-while turn <= 30000000:
+    while turn <= turns:
         if not last_turn:
             new_spoken = 0
         else:
             new_spoken = turn - 1 - last_turn
 
-    last_turn = spoken.get(new_spoken, 0)
+        last_turn = spoken[new_spoken]
         spoken[new_spoken] = turn
         turn += 1
 
     print(new_spoken)
+
+play_number_of_turns(30000000)