Day 6 part 1.

2021/6/data

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+3,1,4,2,1,1,1,1,1,1,1,4,1,4,1,2,1,1,2,1,3,4,5,1,1,4,1,3,3,1,1,1,1,3,3,1,3,3,1,5,5,1,1,3,1,1,2,1,1,1,3,1,4,3,2,1,4,3,3,1,1,1,1,5,1,4,1,1,1,4,1,4,4,1,5,1,1,4,5,1,1,2,1,1,1,4,1,2,1,1,1,1,1,1,5,1,3,1,1,4,4,1,1,5,1,2,1,1,1,1,5,1,3,1,1,1,2,2,1,4,1,3,1,4,1,2,1,1,1,1,1,3,2,5,4,4,1,3,2,1,4,1,3,1,1,1,2,1,1,5,1,2,1,1,1,2,1,4,3,1,1,1,4,1,1,1,1,1,2,2,1,1,5,1,1,3,1,2,5,5,1,4,1,1,1,1,1,2,1,1,1,1,4,5,1,1,1,1,1,1,1,1,1,3,4,4,1,1,4,1,3,4,1,5,4,2,5,1,2,1,1,1,1,1,1,4,3,2,1,1,3,2,5,2,5,5,1,3,1,2,1,1,1,1,1,1,1,1,1,3,1,1,1,3,1,4,1,4,2,1,3,4,1,1,1,2,3,1,1,1,4,1,2,5,1,2,1,5,1,1,2,1,2,1,1,1,1,4,3,4,1,5,5,4,1,1,5,2,1,3

2021/6/example_data

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+3,4,3,1,2

2021/6/main.py

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+def SimulateFish(days_until_next_fish, total_days_left):
+    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
+
+
+
+#### MAIN EXECUTION ####
+fish = []
+with open('data', 'r') as fp:
+    fish = fp.readline().strip().split(',')
+
+grand_total = 0
+for i in range(0, len(fish)):
+    grand_total += SimulateFish(int(fish[i]), 80)
+
+print(grand_total)
+