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学号:2023111068
修改思路:
i <= arr.length而不是i < arr.length。i < arr.length,确保索引在有效范围内。正常功能测试:输入 [例子],验证输出。
边界测试:输入空数组、单元素数组等,验证边界处理。
异常测试:输入null,验证是否抛出预期异常。