输入：num = "1432219", k = 3
在方程豹展区，他沉浸式体验了多款硬派越野车型，从设计细节到科技配置都表现出浓厚兴趣，品牌总经理熊甜波全程讲解。
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Now, to be fair, Node.js really has not yet put significant effort into fully optimizing the performance of its Web streams implementation. There's likely significant room for improvement in Node.js' performance results through a bit of applied effort to optimize the hot paths there. That said, running these benchmarks in Deno and Bun also show a significant performance improvement with this alternative iterator based approach than in either of their Web streams implementations as well.