Question

How to check if a number is pandigital in Kotlin

Answer 1

// A pandigital number is an integer that contains each digit from 0 to 9 
// at least once, with the condition that the leading digit must be nonzero

// for example, 1023456987 is a pandigital number 

fun isPandigitalRange(num: Long, start: Int = 1, end: Int = 9): Boolean {
    val str = num.toString()

    // Build the expected digit string
    val expected = (start..end).joinToString("") { it.toString() }

    // Sort digits of the number
    val sorted = str.toCharArray().sorted().joinToString("")

    return sorted == expected
}

fun main() {
    println(isPandigitalRange(123456789))         
    println(isPandigitalRange(1023456789, 0, 9))  
    println(isPandigitalRange(987654321))         
    println(isPandigitalRange(123456780))        
    println(isPandigitalRange(123456780))         
    println(isPandigitalRange(123455789))          
    println(isPandigitalRange(12345))            
}



/*
run:

true
true
true
false
false
false
false

*/

 

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