Kotlin Program to Sort Elements in Lexicographical Order (Dictionary Order)

In this article, we will understand how to sort the elements of an array in Lexicographical order in Kotlin. The lexicographical order is a generalization of the alphabetical order of the dictionaries to sequences.

Below is a demonstration of the same −

Suppose our input is −

Alpha Beta Gamma Delta

The desired output would be −

Delta Gamma Beta Alpha

Algorithm

• Step 1 − Start

• Step 2 − Declare three integers: I, j and temp

• Step 3 − Declare a string array myInput

• Step 4 − Run a for-loop, using the swap method, arrange the words in the descending order of their starting letter. Store the values.

• Step 5 − Display the array

• Step 6 − Stop

Example 1

In this example, we will Sort Elements in Lexicographical Order. This is like Dictionary Order. First, create a Kotlin array using the arrayOf() method −

val myInput = arrayOf("Alpha", "Beta", "Gamma", "Delta")

Use a nested for loop to sort the array elements −

for (i in 0..2) {
   for (j in i + 1..3) {
      val temp = myInput[i]
      myInput[i] = myInput[j]
      myInput[j] = temp
   }
}

Display the array elements in lexicographical order

for (i in 0..3) {
   println(myInput[i])
}

Let us now see the complete example to sort elements in lexicographical order

fun main() {
   val myInput = arrayOf("Alpha", "Beta", "Gamma", "Delta")
   println("The input array is defined as: ")
   for (element in myInput) {
      println(element)
   }

   for (i in 0..2) {
      for (j in i + 1..3) {
         val temp = myInput[i]
         myInput[i] = myInput[j]
         myInput[j] = temp
      }
   }
   println("
The lexicographical order of the array is:")
   for (i in 0..3) {
      println(myInput[i])
   }
}

Output

The input array is defined as:
Alpha
Beta
Gamma
Delta

The lexicographical order of the array is:
Delta
Gamma
Beta
Alpha

Example 2

In this example, we will sort Elements in Lexicographical Order (Dictionary Order) −

fun main() {
   val myInput = arrayOf("Alpha", "Beta", "Gamma", "Delta")
   println("The input array is defined as: ")
   for (element in myInput) {
      println(element)
   }

   lexicographicalOrder(myInput)
}

fun lexicographicalOrder(myInput: Array<String>) {
   for (i in 0..2) {
      for (j in i + 1..3) {
         val temp = myInput[i]
         myInput[i] = myInput[j]
         myInput[j] = temp
      }
   }
   println("
The lexicographical order of the array is:")
   for (i in 0..3) {
      println(myInput[i])
   }
}

Output

The input array is defined as:
Alpha
Beta
Gamma
Delta

The lexicographical order of the array is:
Delta
Gamma
Beta
Alpha

AmitDiwan

Updated on: 13-Oct-2022

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