27 lines
975 B
Nim
27 lines
975 B
Nim
import ./common, std/[strutils, sugar, sequtils, options, tables, sets, strformat, algorithm, pegs]
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proc parseInstructionArg(s: string): int =
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let ss = s.split(' ')
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if ss.len > 2 and not (ss[2][0] in 'w'..'z'): ss[2].parseInt
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else: 0
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proc p1(input: Lines): uint64 =
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let instructionArgs = input.map(parseInstructionArg)
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var reversedDigits = initTable[int, int]()
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var cantComputeYet: seq[(int, int)] = @[]
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for i in 0..13:
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let o = i * 18
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if instructionArgs[o+4] == 26:
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let (previousI, previousAddend) = cantComputeYet.pop
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let diff = previousAddend + instructionArgs[o+5]
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if diff < 0:
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reversedDigits[previousI] = 9
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reversedDigits[i] = 9 + diff
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else:
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reversedDigits[previousI] = 9 - diff
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reversedDigits[i] = 9
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else: cantComputeYet.add (i, instructionArgs[o+15])
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reversedDigits.keys.toSeq.sorted.mapIt($reversedDigits[it]).join().parseBiggestUInt()
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time(&"Day 24 Part 1"): echo 24.loadInput.p1
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