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.
self.base_url = "https://example.com"
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arr[j + 1] = key; // 插入到正确位置
输入：["StockSpanner","next","next","next","next","next","next","next"], [[],[100],[80],[60],[70],[60],[75],[85]]