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docs/chapter_computational_complexity/summary.md
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# 小结
### 重点回顾
**算法效率评估**
- 时间效率和空间效率是衡量算法优劣的两个主要评价指标。
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- 我们通常只关注最差空间复杂度，即统计算法在最差输入数据和最差运行时间点下的空间复杂度。
- 常见空间复杂度从小到大排列有 $O(1)$、$O(\log n)$、$O(n)$、$O(n^2)$ 和 $O(2^n)$ 等。
## Q & A
### Q & A
!!! question "尾递归的空间复杂度是 $O(1)$ 吗？"