Cleaned up code for part two of day 6.

2021/6/main2.py

@@ -1,55 +1,35 @@
 # "constants":
-DAYS = 256
+total_fish = 0
 
 # intialize shared data:
 fish_reproducing_on_day = []
-for i in range(0, DAYS + 9):
-    fish_reproducing_on_day.append(0)
 
 # functions:
-def SimulateFish(days_until_next_fish, total_days_left):
-    # # DEBUG(dev):
-    # print('SimulateFish(', days_until_next_fish, ',', total_days_left, ')')
-
-    # If we're past the final date, don't count any more:
-    if(total_days_left - days_until_next_fish <= 0):
-        # add 1 for THIS fish
-        return 1
-
-    total = 0
-    # Add up all the totals of the fish this one is going to spawn
-    for i in range(total_days_left - days_until_next_fish, 0, -7):
-        total += SimulateFish(9, i)
-    # Add this fish, as well
-    total += 1
-
-    # Return grand total from this fish (INCLUDING this fish)
-    return total
-
 def SimulateFishByDay(current_day):
     fish_reproducing_on_day[current_day + 7] += fish_reproducing_on_day[current_day]
     fish_reproducing_on_day[current_day + 9] += fish_reproducing_on_day[current_day]
     return fish_reproducing_on_day[current_day]
 
+def Simulate(days):
+    # reset data in case of multiple simulations:
+    fish_reproducing_on_day.clear()
+    for i in range(0, days + 9):
+        fish_reproducing_on_day.append(0)
+
+    for i in range(0, len(fish)):
+        fish_reproducing_on_day[int(fish[i])] += 1
+
+    grand_total = total_fish # starting fish count
+    for i in range(0, days):
+        grand_total += SimulateFishByDay(i)
+    return grand_total
+
 #### MAIN EXECUTION ####
 fish = []
 with open('data', 'r') as fp:
     fish = fp.readline().strip().split(',')
 
-grand_total_1 = 0
+total_fish = len(fish)
-for i in range(0, len(fish)):
-    grand_total_1 += SimulateFish(int(fish[i]), 80)
 
-print(grand_total_1)
+print(Simulate(80))
-
+print(Simulate(256))
-
-
-for i in range(0, len(fish)):
-    fish_reproducing_on_day[int(fish[i])] += 1
-
-grand_total_2 = 300 # starting fish count
-for i in range(0, DAYS):
-    print(fish_reproducing_on_day)
-    grand_total_2 += SimulateFishByDay(i)
-print(grand_total_2)
-