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	fix: compiler error and reset root (#570)
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		@ -12,7 +12,7 @@ func bucketSort(nums: inout [Double]) {
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    // 1. 将数组元素分配到各个桶中
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    for num in nums {
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        // 输入数据范围 [0, 1),使用 num * k 映射到索引范围 [0, k-1]
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        let i = Int(num * k)
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        let i = Int(num * Double(k))
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        // 将 num 添加进桶 i
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        buckets[i].append(num)
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    }
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@ -123,7 +123,7 @@ class BinarySearchTree {
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            // 当子节点数量 = 0 / 1 时, child = null / 该子节点
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            let child = cur?.left != nil ? cur?.left : cur?.right
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            // 删除节点 cur
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            if cur != root {
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            if cur !== root {
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                if pre?.left === cur {
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                    pre?.left = child
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                } else {
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@ -131,7 +131,7 @@ class BinarySearchTree {
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                }
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            } else {
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                // 若删除节点为根节点,则重新指定根节点
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                root = cur;
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                root = child
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            }
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        }
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        // 子节点数量 = 2
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