If the first 25 numbers are 1 through 25 in a random order, the next number must be the sum of two of those numbers to be valid: Two numbers that sum to a valid number must be different from each other. We’ll call the number valid if it can be presented as a sum of two numbers from the previous sublist, and invalid otherwise. We need to attack a weakness in data encrypted with the eXchange-Masking Addition System (XMAS)! The data is a list of numbers, and we need to find the first number in the list (starting from the 26th) that is not the sum of any 2 of the 25 numbers before it. While solving it, we’ll look into different ways to manipulate lists in Kotlin. Kotlin Program – example.This post continues our “Idiomatic Kotlin” series and provides the solution for the Advent of Code Day 9* challenge. ![]() ![]() Following is an example to print all elements of a list using for loop. To iterate over all the elements of a list, for loop can be used. The filtered output contains elements that satisfy the predicate we passed to filter() function. Kotlin Program – example.kt fun main(args: Array) You can also use array style accessing of elements using square brackets. List.get() is used to read elements of a list using index. ListB is a mutable list of type MutableList. ListA is an immutable list of type List, since each of the element in the list is of type String. Var listB = mutableListOf("Example", "Program", "Tutorial") ![]() In the following example, var listA = listOf("Example", "Program", "Tutorial") To initialize Kotlin List, use mutableListOf(vararg items : T) method.
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