DiagonalDifference

DiagonalDifference.ws.kt

// https://www.hackerrank.com/challenges/diagonal-difference/problem?isFullScreen=true

import java.math.BigDecimal
import kotlin.math.abs
import kotlin.math.absoluteValue

val arr = arrayOf(
    arrayOf(1, 2, 3),
    arrayOf(4, 5, 6),
    arrayOf(9, 8, 9),
)

fun diagonalDifference(arr: Array<Array<Int>>): Int {
    return (arr.foldIndexed(0) { index, acc, row ->
        acc + row[index]
    } - arr.foldIndexed(0) { index, acc, row ->
        acc + row[(arr.size - 1) - index]
    }).absoluteValue
}

diagonalDifference(arr)