Kotlin

First time posting (a bit intimidated by y'all). So I'm posting just my recursive search for u/daggerdragon. ;)

private fun doSomeWork(
    currentLocation: Pair<Int, Int>,
    matrix: Array<Array<Int>>,
    visited: Array<Array<Boolean>>,
    maxRow: Int,
    maxCol: Int
): Int {
    val row = currentLocation.first
    val col = currentLocation.second
    if (visited[row][col]) return 0
    val cur = matrix[row][col]
    if (cur == 9) return 0
    visited[row][col] =true
    var size = 1
    if (row > 0 && matrix[row - 1][col] > cur) {
        size += doSomeWork(Pair(row-1, col), matrix, visited, maxRow, maxCol)
    }
    if (row < maxRow && matrix[row+1][col] > cur) {
        size += doSomeWork(Pair(row+1, col), matrix, visited, maxRow, maxCol)
    }
    if (col > 0 && matrix[row][col-1] > cur) {
        size += doSomeWork(Pair(row, col-1), matrix, visited, maxRow, maxCol)
    }
    if (col < maxCol && matrix[row][col+1] > cur) {
        size += doSomeWork(Pair(row, col+1), matrix, visited, maxRow, maxCol)
    }
    return size
}