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Day 24 part 2

This commit is contained in:
Daniel Flanagan 2021-12-25 00:18:13 -06:00
parent 82b1705bb8
commit 891bc6c4c8
Signed by: lytedev
GPG Key ID: 5B2020A0F9921EF4
1 changed files with 15 additions and 8 deletions
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23
2021/nim/day24.nim
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@ -1,13 +1,12 @@
import ./common, std/[strutils, sugar, sequtils, options, tables, sets, strformat, algorithm, pegs]
import ./common, std/[strutils, sequtils, tables, strformat, algorithm]
proc parseInstructionArg(s: string): int =
let ss = s.split(' ')
if ss.len > 2 and not (ss[2][0] in 'w'..'z'): ss[2].parseInt
else: 0
proc p1(input: Lines): uint64 =
proc process(input: Lines): Table[int, (int, int)] =
let instructionArgs = input.map(parseInstructionArg)
var reversedDigits = initTable[int, int]()
var cantComputeYet: seq[(int, int)] = @[]
for i in 0..13:
let o = i * 18
@ -15,12 +14,20 @@ proc p1(input: Lines): uint64 =
let (previousI, previousAddend) = cantComputeYet.pop
let diff = previousAddend + instructionArgs[o+5]
if diff < 0:
reversedDigits[previousI] = 9
reversedDigits[i] = 9 + diff
result[previousI] = (9, -diff + 1)
result[i] = (9 + diff, 1)
else:
reversedDigits[previousI] = 9 - diff
reversedDigits[i] = 9
result[previousI] = (9 - diff, 1)
result[i] = (9, 1 + diff)
else: cantComputeYet.add (i, instructionArgs[o+15])
reversedDigits.keys.toSeq.sorted.mapIt($reversedDigits[it]).join().parseBiggestUInt()
proc p1(input: Lines): uint64 =
let processed = input.process
processed.keys.toSeq.sorted.mapIt($processed[it][0]).join().parseBiggestUInt()
proc p2(input: Lines): uint64 =
let processed = input.process
processed.keys.toSeq.sorted.mapIt($processed[it][1]).join().parseBiggestUInt()
time(&"Day 24 Part 1"): echo 24.loadInput.p1
time(&"Day 24 Part 2"): echo 24.loadInput.p2