import kotlin.random.Random
// ------------------------------------------------------------
// Function: generate_number
// Purpose: Create one 3-digit integer with distinct digits,
// drawn from a shared pool of available digits.
// The first digit is never zero, so the result
// is always a true 3-digit integer.
// ------------------------------------------------------------
fun generate_number(availableDigits: MutableList<String>, length: Int = 3): Int {
// Choose the first digit from the pool, excluding '0'
val nonZeroDigits = availableDigits.filter { it != "0" }
val firstDigit = nonZeroDigits.random()
availableDigits.remove(firstDigit)
// Choose the remaining digits from the updated pool
val remaining = mutableListOf<String>()
repeat(length - 1) {
val d = availableDigits.random()
remaining.add(d)
availableDigits.remove(d)
}
// Build the number as a string, then convert to int
val digitsStr = firstDigit + remaining.joinToString("")
return digitsStr.toInt()
}
// ------------------------------------------------------------
// Function: generate_three_distinct_digit_numbers
// Purpose: Produce three integers, each with distinct digits,
// and no digit repeated across all three numbers.
// All numbers are guaranteed to be 3 digits long.
// ------------------------------------------------------------
fun generate_three_distinct_digit_numbers(): Triple<Int, Int, Int> {
// Start with all digits 0–9 as strings
val digits = MutableList(10) { it.toString() }
// Generate three numbers, each 3 digits long
val n1 = generate_number(digits)
val n2 = generate_number(digits)
val n3 = generate_number(digits)
return Triple(n1, n2, n3)
}
// ------------------------------------------------------------
// Main execution
// ------------------------------------------------------------
fun main() {
// Run the generator 5 times
repeat(5) {
val (n1, n2, n3) = generate_three_distinct_digit_numbers()
println("($n1, $n2, $n3)")
}
}
/*
run:
(579, 132, 860)
(709, 312, 684)
(840, 265, 397)
(146, 975, 382)
(751, 849, 603)
*/
