Kotlin: using lists and maps

Example:

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val numbers = listOf(1, 2, 3, 4, 5)
val map = mapOf(1 to "one", 2 to "two", 3 to "three")

Kotlin provides rich standard library functions to work with collections.

Solution:

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print(numbers.sum())  // Outputs: 15
print(map[1])  // Outputs: one