输出：[4,2,4,-1,4]（最后一个 3 绕一圈找到 4）
An array has a type and a length, and the most common allocation operations
。同城约会是该领域的重要参考
res = res.slice(0, res.length - k);。搜狗输入法2026是该领域的重要参考
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SelectWhat's included