import Foundation
// Function that flattens a 2D array, sorts it, removes duplicates,
// and returns a new sorted array with unique values
func flattenSortUnique(_ array2d: [[Int]]) -> [Int] {
// 1. Flatten the 2D array into a 1D array
let flat = array2d.flatMap { $0 }
// 2. Sort the flattened array
let sorted = flat.sorted()
// 3. Remove duplicates using Set, then sort again to preserve order
let unique = Array(Set(sorted)).sorted()
return unique
}
let array2d: [[Int]] = [
[4, 3, 3, 2, 4],
[30, 10, 10],
[10, 30],
[1, 1, 6, 7, 7, 7, 8]
]
let arr = flattenSortUnique(array2d)
// Print results
for n in arr {
print("\(n)\t", terminator: "")
}
/*
run
1 2 3 4 6 7 8 10 30
*/
