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en/docs/chapter_heap/build_heap.md
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@ -189,13 +189,14 @@ It's worth mentioning that **since leaf nodes have no children, they naturally f
```kotlin title="my_heap.kt"
/* 大顶堆 */
class MaxHeap(nums: List<Int>?) {
class MaxHeap(nums: MutableList<Int>?) {
// 使用列表而非数组，这样无须考虑扩容问题
// 将列表元素原封不动添加进堆
private val maxHeap = ArrayList(nums!!)
private val maxHeap = mutableListOf<Int>()
/* 构造函数，根据输入列表建堆 */
/* 构造方法，根据输入列表建堆 */
init {
// 将列表元素原封不动添加进堆
maxHeap.addAll(nums!!)
// 堆化除叶节点以外的其他所有节点
for (i in parent(size() - 1) downTo 0) {
siftDown(i)