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Merged
merged 4 commits into from
May 17, 2023
Merged

Update 0046-permutations.kt #2445

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455ce9c
Update 0046-permutations.kt
FilipeLipan May 1, 2023
127b734
Update 0046-permutations.kt
FilipeLipan May 1, 2023
fa580bd
Revert 0046-permutations.kt to add old solution plus the new one
FilipeLipan May 9, 2023
8df8f9c
Update 0046-permutations.kt change the order of solutions, to show vi…
FilipeLipan May 17, 2023
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Update 0046-permutations.kt
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@FilipeLipan
FilipeLipan committed May 1, 2023
commit 127b734d8db169defd86a2108da9b99df3fffc85
17 changes: 6 additions & 11 deletions kotlin/0046-permutations.kt
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Original file line number Diff line number Diff line change
@@ -1,25 +1,20 @@
class Solution {
fun permute(nums: IntArray): List<List<Int>> {
val res = mutableListOf<List<Int>>()
val queue = ArrayDeque<Int>()

for (num in nums) {
queue.add(num)
}
fun permute(nums: IntArray): List<MutableList<Int>> {
val res = mutableListOf<MutableList<Int>>()
val queue = ArrayDeque<Int>(nums.toList())

// base case
if (queue.size == 1) {
return listOf(queue.toList()) // queue.toList() is a deep copy
return listOf(queue.toMutableList()) // queue.toList() is a deep copy
}

for (i in nums.indices) {
val n = queue.removeFirst()
val perms = permute(queue.toIntArray())

for (perm in perms) {
val mutablePerm = perm.toMutableList()
mutablePerm.add(n)
res.add(mutablePerm)
perm.add(n)
res.add(perm)
}
queue.addLast(n)
}
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