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krahets
2024-04-07 03:05:15 +08:00
parent aea68142f8
commit d8caf02e9e
21 changed files with 118 additions and 101 deletions
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18
docs/chapter_backtracking/permutations_problem.md
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@@ -471,11 +471,11 @@ comments: true
state: MutableList<Int>,
choices: IntArray,
selected: BooleanArray,
res: MutableList<List<Int>?>
res: MutableList<MutableList<Int>?>
) {
// 当状态长度等于元素数量时，记录解
if (state.size == choices.size) {
res.add(ArrayList(state))
res.add(state.toMutableList())
return
}
// 遍历所有选择
@@ -496,9 +496,9 @@ comments: true
}
/* 全排列 I */
fun permutationsI(nums: IntArray): List<List<Int>?> {
val res: MutableList<List<Int>?> = ArrayList()
backtrack(ArrayList(), nums, BooleanArray(nums.size), res)
fun permutationsI(nums: IntArray): MutableList<MutableList<Int>?> {
val res = mutableListOf<MutableList<Int>?>()
backtrack(mutableListOf(), nums, BooleanArray(nums.size), res)
return res
}
```
@@ -999,11 +999,11 @@ comments: true
) {
// 当状态长度等于元素数量时，记录解
if (state.size == choices.size) {
res.add(ArrayList(state))
res.add(state.toMutableList())
return
}
// 遍历所有选择
val duplicated: MutableSet<Int> = HashSet()
val duplicated = HashSet<Int>()
for (i in choices.indices) {
val choice = choices[i]
// 剪枝：不允许重复选择元素 且 不允许重复选择相等元素
@@ -1023,8 +1023,8 @@ comments: true
/* 全排列 II */
fun permutationsII(nums: IntArray): MutableList<MutableList<Int>?> {
val res: MutableList<MutableList<Int>?> = ArrayList()
backtrack(ArrayList(), nums, BooleanArray(nums.size), res)
val res = mutableListOf<MutableList<Int>?>()
backtrack(mutableListOf(), nums, BooleanArray(nums.size), res)
return res
}
```