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@ -105,7 +105,7 @@ comments: true
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// 将列表元素原封不动添加进堆
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maxHeap = nums
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// 堆化除叶节点以外的其他所有节点
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for i in stride(from: parent(i: size() - 1), through: 0, by: -1) {
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for i in (0 ... parent(i: size() - 1)).reversed() {
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siftDown(i: i)
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}
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}
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@ -280,7 +280,35 @@ comments: true
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=== "Swift"
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```swift title="heap.swift"
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// Swift 未提供内置 Heap 类
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/* 初始化堆 */
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// Swift 的 Heap 类型同时支持最大堆和最小堆,且需要引入 swift-collections
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var heap = Heap<Int>()
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/* 元素入堆 */
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heap.insert(1)
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heap.insert(3)
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heap.insert(2)
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heap.insert(5)
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heap.insert(4)
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/* 获取堆顶元素 */
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var peek = heap.max()!
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/* 堆顶元素出堆 */
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peek = heap.removeMax() // 5
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peek = heap.removeMax() // 4
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peek = heap.removeMax() // 3
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peek = heap.removeMax() // 2
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peek = heap.removeMax() // 1
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/* 获取堆大小 */
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let size = heap.count
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/* 判断堆是否为空 */
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let isEmpty = heap.isEmpty
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/* 输入列表并建堆 */
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let heap2 = Heap([1, 3, 2, 5, 4])
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```
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=== "JS"
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@ -194,7 +194,7 @@ comments: true
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// 初始化一个小顶堆,并将前 k 个元素建堆
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var heap = Heap(nums.prefix(k))
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// 从第 k+1 个元素开始,保持堆的长度为 k
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for i in stride(from: k, to: nums.count, by: 1) {
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for i in nums.indices.dropFirst(k) {
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// 若当前元素大于堆顶元素,则将堆顶元素出堆、当前元素入堆
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if nums[i] > heap.min()! {
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_ = heap.removeMin()
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