build

docs/chapter_sorting/bucket_sort.md

@@ -395,9 +395,9 @@ comments: true
     fun bucketSort(nums: FloatArray) {
         // 初始化 k = n/2 个桶，预期向每个桶分配 2 个元素
         val k = nums.size / 2
-        val buckets = ArrayList<ArrayList<Float>>()
+        val buckets = mutableListOf<MutableList<Float>>()
         for (i in 0..<k) {
-            buckets.add(ArrayList())
+            buckets.add(mutableListOf())
         }
         // 1. 将数组元素分配到各个桶中
         for (num in nums) {