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joshrotenberg/diag.kt

Created June 27, 2019 18:53
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diag.kt
import kotlin.math.absoluteValue
fun diagonalDifference(arr: Array<Array<Int>>) = arr
.mapIndexed { index, ints -> Pair(ints[index], ints[arr.size - index - 1]) }
.reduce { pair, acc -> Pair(pair.first + acc.first, pair.second + acc.second) }
.let { pair -> pair.first - pair.second }
.absoluteValue
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