advent_of_code_2022_day_6.nim

import std/strformat, std/sets

proc findMarker(input: string, length: int): int =
    for idx in 0..<input.len:
        if input[idx..<idx+length].toHashSet.len == length:
            result = idx + length
            break

proc findStartOfPacket*(input: string): int =
    findMarker(input, 4)

proc findStartOfMessage*(input: string): int =
    findMarker(input, 14)

let input = open("day-6/input.txt").readAll

echo fmt"Start of packet marker position: {findStartOfPacket(input)}"
echo fmt"Start of message marker position: {findStartOfMessage(input)}"