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Day6CustomCustoms.kt
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package aoc
import org.assertj.core.api.KotlinAssertions.assertThat
import org.junit.Test
import kotlin.streams.toList
/**
* [--- Day 6: Custom Customs ---](https://adventofcode.com/2020/day/6)
*/
class Day6CustomCustoms {
private val testInput = """
abc
a
b
c
ab
ac
a
a
a
a
b
""".trimIndent()
@Test
fun silverTest() {
assertThat(countYesAnswers(testInput)).isEqualTo(11)
}
@Test
fun silver() {
assertThat(countYesAnswers(input)).isEqualTo(6633)
}
@Test
fun goldTest() {
assertThat(countUnanimousYesAnswers(testInput)).isEqualTo(6)
}
@Test
fun gold() {
assertThat(countUnanimousYesAnswers(input)).isEqualTo(3202)
}
@Test
fun silverJohannes() {
// Johannes claims 6742 is correct, but I think it is not correct
// assertThat(countYesAnswers(johannesInput)).isEqualTo(6742)
assertThat(countYesAnswers(johannesInput)).isEqualTo(6746)
}
@Test
fun goldJohannes() {
assertThat(countUnanimousYesAnswers(johannesInput)).isEqualTo(3447)
}
private fun countYesAnswers(input: String): Int {
return input.split("\n\n")
.map { countAnswersWithYesAnswersWithinGroup(it) }
.sum()
}
private fun countUnanimousYesAnswers(input: String): Int {
return input.split("\n\n")
.map { countUnanimousYesAnswersWithinGroup(it) }
.sum()
}
/**
* The first group contains one person who answered "yes" to 3 questions: a, b, and c.
* The second group contains three people; combined, they answered "yes" to 3 questions: a, b, and c.
* The third group contains two people; combined, they answered "yes" to 3 questions: a, b, and c.
* The fourth group contains four people; combined, they answered "yes" to only 1 question, a.
* The last group contains one person who answered "yes" to only 1 question, b.
* In this example, the sum of these counts is 3 + 3 + 3 + 1 + 1 = 11.
* For each group, count the number of questions to which anyone answered "yes". What is the sum of those counts?
*/
private fun countAnswersWithYesAnswersWithinGroup(group: String): Int {
return group.replace("\n", "")
.chars()
.toList()
.toSet()
.count()
}
private fun countUnanimousYesAnswersWithinGroup(group: String): Int {
return group.lines().map { it.chars().toList().toSet() }
.reduce { l, r -> l.intersect(r) }
.count()
}
private val input = """
necytxmlfhsu
uecosjvlhpmk
mnslbuziphawkxyg
whpmnesikaglzb
kaw
akw
qurg
hrqug
qrgu
gruq
sczomkv
zejkhvslmucbwdo
pxsianovzcmk
tcokmvsyz
ozskvimcr
tfzajkxngwsqrbleic
tijoqnerxsplwzgabkfc
ogkezbiwqtaxrscljfn
xsqauezwnjckbtgiryfdml
piz
zip
tlp
npl
lpt
idbnxuclqgw
sxfdnlatmbhcowigj
plzgbwdqkcinx
ydxinwgcblr
nbuxjwhsrlekfyzpq
kecyiurjfvqpbxhzsn
nkxfhpbsuyrqjezom
tinlhkbjsuydrqpzexf
pnzraelgquxhydsbjkf
obvmw
eoczsqun
nhdxqwk
dnzmlxwhkapq
whxqdnk
jnqdabgc
nacqdbgj
buyskiwz
uazbkwys
mbfxswpli
uswalhxz
xnq
tdcrjgoyekv
fancdpkmtuqy
zdmenqjpaxftuy
jkul
d
o
vhpoxgqsrtce
hgopxeqcdrstv
xcvrqoetpsgh
gekpzayfux
pyegazxukf
pkxaezhgyfu
fegypukaxz
zxpyefugka
yrpfd
ydsh
smjqcafnug
mnicqsu
tkxi
ixakt
tfncxkmi
kedibluzopjhagvtxf
afiklbvtjeoudhgpzx
lavbxpjzgedktoifuh
tbgpaxjqeoifvklhzud
zghidtfplxbvkoueja
gtvnqyrmf
hogpb
cnelsqwj
atyimdbvfxuozkg
lgybpaeztvhrxducjiqosmnwk
ivpaygxweszductombhljrqk
grli
lrig
sjglri
girl
rigl
qnwmxjbpecoyztufidhsg
ynqdiwhmusgtebjfzxcpo
luasrtmfkgywv
vgskmufywrat
ceyux
ycux
nurijfsovkbxdp
ayqclmthgzwe
xeqjdhsubiovwrg
gobdjqwvusehrx
weqjgvhosudrbx
ngdubsvqxejrhow
ywdfqpxekujbovr
yujfdoqbkxrepvw
owfkudjbvyrxqep
oqjvedypxukwbrf
xufwdpebyjrqokv
csujqndzmw
wznscqmjud
cqpwjzmunda
wjumnzcqd
dhsow
ohswd
wsnogh
cxfltiq
ixztfq
gtfqiux
jtqfxi
xiftzq
tr
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pnuztcbegwiksd
cuewibkptdnm
nvqdpcjxekiwtauhofb
pbytreinuwdkc
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