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33 lines
627 B
33 lines
627 B
#!/usr/bin/env python
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from aoc import get_input # AoC
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from collections import defaultdict as dd
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nums = list(map( int, get_input(15).split(",")))
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firstNums = dd(list)
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for i, n in enumerate(nums):
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firstNums[n].append(i)
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def numbers(maxt):
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num = nums[-1]
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for i in range(len(nums), maxt):
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numsSeen = len(firstNums[num])
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if( numsSeen > 1 ):
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num = firstNums[num][-1] - firstNums[num][-2]
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else:
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num = 0
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#print(f"{num=} {i=} {nums=}")
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firstNums[num].append(i)
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return num
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#maxturn = 2020
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#maxturn = 30000000
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maxturn = 10
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print(numbers(maxturn))
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