算法的定义：算法是解决特定问题的一组有穷的、明确的、可执行的指令序列。算法具有以下五个基本特性： 算法的时间复杂度是衡量算法效率的核心指标，通常用基本操作执行次数来衡量。 渐进符号用于描述算法复杂度在输入规模趋于无穷时的增长趋势。

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