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Ingy döt Net 2023-07-01 11:58:00 -04:00
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commit cb5bb5e222
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109
Task/UPC/Kotlin/upc.kotlin Normal file
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val LEFT_DIGITS = mapOf(
" ## #" to 0,
" ## #" to 1,
" # ##" to 2,
" #### #" to 3,
" # ##" to 4,
" ## #" to 5,
" # ####" to 6,
" ### ##" to 7,
" ## ###" to 8,
" # ##" to 9
)
val RIGHT_DIGITS = LEFT_DIGITS.mapKeys {
it.key.replace(' ', 's').replace('#', ' ').replace('s', '#')
}
const val END_SENTINEL = "# #"
const val MID_SENTINEL = " # # "
fun decodeUPC(input: String) {
fun decode(candidate: String): Pair<Boolean, List<Int>> {
var pos = 0
var part = candidate.slice(pos until pos + END_SENTINEL.length)
if (part == END_SENTINEL) {
pos += END_SENTINEL.length
} else {
return Pair(false, emptyList())
}
val output = mutableListOf<Int>()
for (i in 0 until 6) {
part = candidate.slice(pos until pos + 7)
pos += 7
if (LEFT_DIGITS.containsKey(part)) {
output.add(LEFT_DIGITS.getOrDefault(part, -1))
} else {
return Pair(false, output.toList())
}
}
part = candidate.slice(pos until pos + MID_SENTINEL.length)
if (part == MID_SENTINEL) {
pos += MID_SENTINEL.length
} else {
return Pair(false, output.toList())
}
for (i in 0 until 6) {
part = candidate.slice(pos until pos + 7)
pos += 7
if (RIGHT_DIGITS.containsKey(part)) {
output.add(RIGHT_DIGITS.getOrDefault(part, -1))
} else {
return Pair(false, output.toList())
}
}
part = candidate.slice(pos until pos + END_SENTINEL.length)
if (part == END_SENTINEL) {
pos += END_SENTINEL.length
} else {
return Pair(false, output.toList())
}
val sum = output.mapIndexed { i, v -> if (i % 2 == 0) v * 3 else v }.sum()
return Pair(sum % 10 == 0, output.toList())
}
val candidate = input.trim()
var out = decode(candidate)
if (out.first) {
println(out.second)
} else {
out = decode(candidate.reversed())
if (out.first) {
print(out.second)
println(" Upside down")
} else {
if (out.second.size == 12) {
println("Invalid checksum")
} else {
println("Invalid digit(s)")
}
}
}
}
fun main() {
val barcodes = listOf(
" # # # ## # ## # ## ### ## ### ## #### # # # ## ## # # ## ## ### # ## ## ### # # # ",
" # # # ## ## # #### # # ## # ## # ## # # # ### # ### ## ## ### # # ### ### # # # ",
" # # # # # ### # # # # # # # # # # ## # ## # ## # ## # # #### ### ## # # ",
" # # ## ## ## ## # # # # ### # ## ## # # # ## ## # ### ## ## # # #### ## # # # ",
" # # ### ## # ## ## ### ## # ## # # ## # # ### # ## ## # # ### # ## ## # # # ",
" # # # # ## ## # # # # ## ## # # # # # #### # ## # #### #### # # ## # #### # # ",
" # # # ## ## # # ## ## # ### ## ## # # # # # # # # ### # # ### # # # # # ",
" # # # # ## ## # # ## ## ### # # # # # ### ## ## ### ## ### ### ## # ## ### ## # # ",
" # # ### ## ## # # #### # ## # #### # #### # # # # # ### # # ### # # # ### # # # ",
" # # # #### ## # #### # # ## ## ### #### # # # # ### # ### ### # # ### # # # ### # # ",
)
for (barcode in barcodes) {
decodeUPC(barcode)
}
}