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import std/strutils
import std/sequtils
import std/sets
proc Points(c: char): int =
if c.isLowerAscii():
return ord(c) - ord('a') + 1
else:
return ord(c) - ord('A') + 27
proc part1(content: seq[string]): int =
let ruckshacks = map( content,
proc(line: string): tuple[first: string, second: string] =
let pivot = int(line.len()/2)
(line[0 .. pivot-1], line[pivot .. ^1])
)
var score = 0
for ruckshack in ruckshacks:
let
uniqFirst = toHashSet(ruckshack.first)
uniqSecond = toHashSet(ruckshack.second)
var c = toSeq(uniqFirst * uniqSecond)[0]
score += Points(c)
return score
proc part2(content: seq[string]): int =
assert(content.len() mod 3 == 0)
let ruckshacks = content
var score = 0
for i in countup(0, ruckshacks.len()-1, 3):
let
uniqFirst = toHashSet(ruckshacks[i])
uniqSecond = toHashSet(ruckshacks[i+1])
uniqThird = toHashSet(ruckshacks[i+2])
var c = toSeq(uniqFirst * uniqSecond * uniqThird)[0]
score += Points(c)
return score
let content = readFile("./input.txt").strip().split("\n")
echo part1(content)
echo part2(content)
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