They are almost the same: they share the same underlying array. You do get a copy of the little (ptr, len, capacity) struct which is what a slice is.
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。heLLoword翻译官方下载对此有专业解读
merge(arr, left, mid, right); // 合并两部分，详情可参考51吃瓜
An important note is that the number of times a letter is highlighted from previous guesses does necessarily indicate the number of times that letter appears in the final hurdle.