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Copy pathDay5BinaryBoarding.kt
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Day5BinaryBoarding.kt
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package aoc
import org.assertj.core.api.KotlinAssertions.assertThat
import org.junit.Test
/**
* From https://adventofcode.com/2020/day/5
*
* --- Day 5: Binary Boarding ---
*
* The first 7 characters will either be F or B; these specify exactly one of the 128 rows on the plane (numbered 0 through 127).
* Each letter tells you which half of a region the given seat is in.
* Start with the whole list of rows;
* the first letter indicates whether the seat is in the front (0 through 63) or the back (64 through 127).
* The next letter indicates which half of that region the seat is in, and so on until you're left with exactly one row.
*
*/
class Day5BinaryBoarding {
data class Ticket(
val code: String
) {
val row: Int = code.take(7)
.replace('F', '0')
.replace('B', '1')
.toInt(2)
val column: Int = code.drop(7)
.replace('L', '0')
.replace('R', '1')
.toInt(2)
val seatId: Int = row * 8 + column
}
/**
* For example, consider just the first seven characters of FBFBBFFRLR:
*
* Start by considering the whole range, rows 0 through 127.
* F means to take the lower half, keeping rows 0 through 63.
* B means to take the upper half, keeping rows 32 through 63.
* F means to take the lower half, keeping rows 32 through 47.
* B means to take the upper half, keeping rows 40 through 47.
* B keeps rows 44 through 47.
* F keeps rows 44 through 45.
* The final F keeps the lower of the two, row 44.
* The last three characters will be either L or R; these specify exactly one of the 8 columns of seats on the plane (numbered 0 through 7). The same process as above proceeds again, this time with only three steps. L means to keep the lower half, while R means to keep the upper half.
*
* For example, consider just the last 3 characters of FBFBBFFRLR:
*
* Start by considering the whole range, columns 0 through 7.
* R means to take the upper half, keeping columns 4 through 7.
* L means to take the lower half, keeping columns 4 through 5.
* The final R keeps the upper of the two, column 5.
* So, decoding FBFBBFFRLR reveals that it is the seat at row 44, column 5.
*
* Every seat also has a unique seat ID: multiply the row by 8, then add the column. In this example, the seat has ID 44 * 8 + 5 = 357.
*/
@Test
fun silverExample() {
assertThat(Ticket("FBFBBFFRLR").row).isEqualTo(44)
assertThat(Ticket("FBFBBFFRLR").column).isEqualTo(5)
assertThat(Ticket("FBFBBFFRLR").seatId).isEqualTo(357)
}
@Test
fun silverParsingTest() {
// BFFFBBFRRR: row 70, column 7, seat ID 567.
assertThat(Ticket("BFFFBBFRRR").row).isEqualTo(70)
assertThat(Ticket("BFFFBBFRRR").column).isEqualTo(7)
assertThat(Ticket("BFFFBBFRRR").seatId).isEqualTo(567)
// FFFBBBFRRR: row 14, column 7, seat ID 119.
assertThat(Ticket("FFFBBBFRRR").row).isEqualTo(14)
assertThat(Ticket("FFFBBBFRRR").column).isEqualTo(7)
assertThat(Ticket("FFFBBBFRRR").seatId).isEqualTo(119)
// BBFFBBFRLL: row 102, column 4, seat ID 820.
assertThat(Ticket("BBFFBBFRLL").row).isEqualTo(102)
assertThat(Ticket("BBFFBBFRLL").column).isEqualTo(4)
assertThat(Ticket("BBFFBBFRLL").seatId).isEqualTo(820)
}
/**
* As a sanity check, look through your list of boarding passes. What is the highest seat ID on a boarding pass?
*/
@Test
fun silver() {
val maxId = input.lines()
.map { Ticket(it).seatId }
.max()
assertThat(maxId).isEqualTo(894)
}
@Test
fun gold() {
val takenSeats = input.lines()
.map { Ticket(it) }
.map { ticket -> Point(x = ticket.row, y = ticket.column) }
.toSet()
val allSeats = (0..127).flatMap { x ->
(0..7).map { y -> Point(x, y) }
}
val mySeat = allSeats.filter { point -> point !in takenSeats }
.first { point ->
listOf(
point.up(),
point.down(),
point.left(),
point.right()
).all { it in takenSeats }
}
assertThat(mySeat.x * 8 + mySeat.y).isEqualTo(579)
}
private val input = """
BFBFBFFRRL
FFFFBBBLLL
FFFBBFBRRR
FFFFBBBRLR
FFBFFBBRRL
BFBBBBBRRR
BBFFFFFRLR
FFFFBBFRLR
BBFFFBBLLL
FBBBBFBLRL
FFBBFFBRLR
BBFFBBFRLL
BBFFFFFLRL
BBFFFFBRLR
BFFFFBFLLL
FFFBFFFRRL
FBBBBBBLLR
FFBFBBFRLL
FBBFFBFLRL
BFBFFBBRLR
BFFBFBBLRR
FFFBFFBRRL
FFBFFBFRLL
FBBBBBFLRL
FFBBFFFRRL
FFBFBFBLRR
BFFFFFBRRL
FFBFBBBRLR
FFFBFFFLRR
BBFFBFFLRR
BFFFBBBRLL
FFBBFFBLRL
BFBBFBFRRR
BFFBBBBLRL
FFBFBFBRLL
FBFFBBBRRR
FBFBBBFLLL
FBBFFBFRLR
FBBFBBFLRR
BFFBFFBLLR
FFFBBBFLLL
FBBFBBFLLR
BFBFFFBRRL
FFFFBFBRLL
BBFFBFFRRR
BFBBFBFLRL
FFBBFFBRRL
FFFBBBFLRR
BFFBFFBLLL
BFFBBFBRLL
FBFBBFBRRL
FFFFFFBRLR
BBFBFFFRRR
BBFFBBFLLL
BFFBFFFLLR
BFBFFBFLRL
FFBBFFFLLR
BFFFFBBRRL
FFBBFFBRRR
FFFFBFFLLR
BFBBFFFLRR
BBFFFBBLRL
BFFFBBBLLR
FFFBBFFRLR
FFBBBBBRLL
BBFFFBFRLR
BBFBFFBRRR
FBBBFFFRLL
FBBBBBBRLR
BFBBFFBRRR
FBFBFFBRRL
FFFBFBBRRL
FFBFFFFLLL
FBFFBFBLRR
BFFBBFFLLR
FFBBBFBRLL
BFFBFFBRRR
FBBFFBFRRR
FBFFBBFRLR
FBBBFFBLRL
BFBBBFBLRL
FFFFBFFRRR
FBBFFFFLLR
FFBFBBFRRR
FBFBBBFLRL
BFFFFFFRLL
FFFFFBFRRR
BFBFFBBRLL
FFBFFFFRLL
FFBFFBFLLL
FFBFFBBRLL
BFBFFBFLLL
BFFBFBBLRL
BFFFBFFRLL
BFFBFBBLLL
BFFFFFFLLR
FBBFBBFRRR
FFBBBBBRLR
BFFBBBBRRR
FFBBFBFRRL
BBFBFBFRRR
FBFFBFFLRR
FBFFBFBLLL
FFFBFBBLRR
BBFBFFFLLL
FFFBBFBLRR
FFBBFFBLLR
BFBBFFFRLL
BFBBFBFLLR
FBFFFFBLLL
BFBBBBFRRR
BBFFFBFRLL
FBBFBFBLRL
FBBBFFFRRR
BBFBBBBLRL
BBFFBFBRRL
BFFFBBBRRL
FBFBBBFRLL
BFBBBFBLLL
BFFBFFFLRL
FFFBBBBRRL
BBFFBFBLRL
FBBFFFFLLL
FBFFBBBLRL
BBFBFBBRLL
FBBBFBFLRL
FBFFBFBLRL
BFBBFFBRRL
FBBFFFFLRR
FFBBBBFRRL
FFBFBFBLLR
FBFFBFFRLR
FFFBBBFRRR
BFFFBFBLLR
FBBBFBFLLL
FBBBBBFRLL
FFBFFFBRLR
FBFFFBBRRL
BBFFBBBLRR
FBFBFFFLRR
BFFFFFFLRL
BBFBFBBLLL
FBFBBFFLLL
FBFFFBBLLL
BFFBBFBLLL
BBFFBBFLRR
BBFFFFFRLL
FFBFFFBLRR
FFBFFFFRRR
FBFFFBFLLL
BFFFBFFRRR
FBBFFFBLRR
FBBBFBBRLR
FFFFFFBRLL
BFBFFBFLLR
BFFFBBFLRR
FBFFBBBLLR
BBFFFFFRRR
FBFBFBBLRL
FBBFBFFLLL
BFFBFBBRLL
BFFBBBFLRR
BFBBFBFRLR
FBBFBFBRRL
FFFFFBBLLR
FFBFFBBRRR
BFFBFBFLLL
BFBBBBBLLL
BBFBBBFRLR
FFBFFBBLLL
BBFFFFBLLR
BBFFFFBLLL
FFBFBFFLLL
BFBFBBBRRR
BBFBBBFLRL
BFBBFFFRRR
FFBFBBFLRL
BBFBBBBLLR
FBFFBFFLLR
FBBFFFFLRL
FFBBFBBLRR
BBFFFFFRRL
BFBFBFBLRR
FFFBBFFLLR
FFFFFBFRLR
BFBFBBFRRL
FFFFFBBRLR
FFFFBFBLLR
FFFFBBFRRR
FFBFBFBLLL
BBFBFBFLLR
BFBFBFFLLL
BFFBBBFRLL
FFBBBBFRLR
BFBBFFFRRL
FFFFFFFRRL
FFFBFBBRLL
FBFFFFFRLR
BBFFBBFRRR
FBBFFBBLLL
BFFFBBFRLR
BFBBFFFLRL
BFFBBFFLLL
BFFFBFFLRL
FBFBBFFRRR
FFFBBBFRRL
FFFFBBFLLL
FBBFBBBRLL
BFBBFBFRLL
FBBBBFBRRL
FFBFFFBLRL
BFBBFBBRRL
BFBBFFFLLR
FBBBBFBRLR
BBFBFFFRLR
FBBFBFFLRL
FFBFBFFRRR
FFBFBFBLRL
BBFBFBBLRR
BBFBBFBRLR
BFBBBFBLRR
FFBBBFBLRR
BBFFFBFLRR
FFFBBFFRRL
BBFFBBBRLR
FFFBFBFLLL
BFBFBBBLRL
FBFBFFBRLL
FBFFBBBRRL
FFFFBBFLRR
FBFFBBFLLR
FFBFFBFLLR
BFBFFBBRRR
BFBBFFBLLR
BBFBBBBRRL
FFBFBFFRLL
FBBFFFBLLR
FFBBBBFLLR
FBFBFBFLRL
BFFBBFBLRL
BFBFFBFRLR
FFFFFFFRRR
BFBBBFFRRR
FFBBFFFRLR
FBFBBFBLRR
BFBBBBFRRL
FFFFBBFRLL
FBBBBFFRLL
FBFFFFFRRL
FBFFBFFRRL
BBFBBFBLLL
BFFFBFBRLR
FBFBFBBRRL
FFFBFFBRLR
BBFFBFFLRL
FFBFFBFLRR
FFBBBBFRLL
BFBBFBFLRR
FFBFFFBLLL
BBFBBFFLLL
FFFBFBBLRL
BFFFBFFRLR
FFFBFFFRRR
FBBFFBBRRL
BFFBFFBRLL
BFFBBBFLLL
FBFBBBBRLR
FBFFBFBRLL
FBFBBBFLLR
FFFBFFFLLL
FFFBFFBLLR
FBBFFBBLLR
FBBFBBBLLL
BFBBBFFLRR
BFBFFBBLLL
FFBFBFBRRL
FFBFBFFLLR
FBFBFFFRRL
FFBBFBBRLL
BBFFFBBLRR
FBFBFBBLRR
BFFFBFBLRR
BFBFFFFRRL
BFFFBBBLRL
FFFFFBBRRR
BBFBBFBRRR
FFBFBFBRRR
FFFFBFFLLL
BFBFFBBLLR
FBBBFBBRRL
FBBBFFFRLR
FFFBBFBLRL
FFBBBFFRLL
FFFFFBBLRL
BFBFFBFRRL
FBBFFBFLRR
BFFBFFFLLL
FBBFBFBLLL
BFBBFFBLRL
FFBBBBBLLL
FBFBFBFRLR
BBFBBFBLRR
BFBBBBBLRR
FBFBBFFLLR
FFBFBBFRRL
FFFBBFBRRL
BFFFFFFLLL
BBFBBBFLLR
FBFFBBFLLL
FBFBBFBLLR
BFBBBFBRLR
BFBFFFFRLR
FBBFBFFRLR
BBFFFFFLRR
BBFBFBBLRL
BBFBFBBRRR
FFBBFBFLLL
FBFBBFFLRL
BFBFBBFLLR
BBFBBBBLLL
FFBBFFBRLL
FFFFBBFLRL
FFBBFBFLLR
BFBBBFBRLL
FFFBFFBRRR
FBBBBFFLRL
FBFFBBBLRR
FBBBFBBLRR
FBBBFFBRRL
BFFBFBFRRR
BBFBFBBRRL
FBBFBBBLLR
FBBFBFBLRR
FBFFFFBLRR
FBFBFBBRLL
FBFFFBFLRR
BBFBBBFLRR
BFBFBBBLLL
FFBFFBFRRR
BBFFFBBRLR
BFFBBFBLLR
FBFBBFBRLL
FFBFBBBRRR
FBFFFFBRLL
FBBBFFFLRL
BFBFBFBRLR
FBBBFBBLRL
FBFFBBBLLL
FFFBBBFLLR
BFFFBBFRLL
FBFFFBFRLR
BFFFBBFRRL
BFFFFBFRRL
BBFFBBBLLR
FBBFFFFRLR
FFBFBFFRLR
BFBFBBBLRR
FFFFBBBLRR
FFBFFFBRLL
FFFFBBBLRL
FFBBBBFLRL
BBFFFFBRRL
FFFFFBFLRR
BFFFBFBRRR
BBFBBFFLRR
FFBFBBFLRR
FFFFFBBRRL
BFBFFFFLRL
BFFBBFBRLR
FBFFFFBRRL
BFBBFBBLLL
BFBBBFBRRL
BFBBBBBRLL
FFFBBBBLRR
FBBFBBFLLL
BFFFFBBLLR
FFBFFFBLLR
FBBFFBFRRL
FFBBBFFLRR
BFFFBBBRRR
FFFFBBBRRR
FFFBFFBLLL
BFFFFBBRLL
FBBBFBFRRL
FFBBBBFLLL
BBFBFBBRLR
FBFFBBFLRL
FBBFBFFRRR
BBFFFFBLRR
FBBBFBBLLR
FFFBFFBLRL
BFFBFBFRLL
FBFFFFBRLR
FFFFBFFRLR
BFBFBFBRRL
FBBFBBFRRL
BBFFBFBLLR
FFBFFFFLRR
BFFFFFBRLL
FFFFBBFRRL
FBFFFBFLRL
FFBBFBBLRL
BFFBBFBRRR
BBFBBBFLLL
FBBFBBBRRR
BFFBFBBRLR
FBBBFFBRLL
FBBFBFFLLR
BFFBFBBLLR
FFBFFFFLRL
BFFBFBFLLR
BBFBBBBRLR
FFBBBFFLRL
FBBFFFBRLR
BFFFFFBRLR
FBFFFFFLLR
FBFFFBFRRR
FFBBFBFRLL
FBFBFFFRLR
BFBFBBFRRR
BBFFFBBRRR
FBBFBFBLLR
BFFBFBFLRL
FFFBFFFRLR
FBBBFBFLLR
FFBBBFBRRR
BFBFFBBLRL
FBBBFFBLRR
BFFFFFFRRR
FFBBFFFLRR
BFBFFFBRLR
BFBFBFBRRR
BBFBFBFLLL
FBFFBFBRRL
BBFBBFFLRL
FBBBBBBLLL
FBFFBBFRRR
FFFFBFFRRL
FFFBBFBLLL
FBFFFBBLLR
FFBBBBBLRR
FBFBFFFRLL
BFFBBBBRRL
FFFBFBBLLL
FFFFFFBLLR
BBFFBFBRLL
FBBBBBFRRR
BBFBFFFRLL
FFFFBFBLRR
BFBFFFFRLL
BFBBBBFRLR
FBFBFBFRRL
FBFBFFFRRR
FBBFFFBRRR
FBBFBFFRLL
FFFBFFFLLR
FBFBBBFRLR
FFBFFFBRRL
FBBBBBFRRL
FBBFFBFLLR
FBFBBFBRRR
FBFFFFFLLL
FBFBBBFLRR
FFFBBBBLLR
FBBBFBBRRR
BBFBBFFRLL
FFFFBFBLLL
BBFBBFBRLL
BFFBBBBLLL
BBFBBFBLLR
BBFFFBBRRL
FFBBBFFRRR
BBFFBFFRLL
FBBBBBFLLR
FBBFFFFRRL
FBBFFBFRLL
FBFBFBFLLR
BBFBBBFRRR
FFFBBFBRLL
BFBBBBFLRR
BFBFFBFRRR
FFBBBFBRRL
BFBFFBBRRL
BBFFBFBRRR
FFBFBBBLLR
FBBFFBBRLR
BFBBBFFRLL
FFFBBBFRLL
FBFBFBFLLL
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