Python 基础知识简单

反转数组

“反转数组”问题的详细指南和 Python 实现。

问题陈述

简单

编写一个函数 reverse_array(arr) ,它接受整数列表 arr 并返回一个新列表,其中元素按相反顺序排列。例如,[1,2,3] 变为 [3,2,1]。

约束条件
  • 0 <= len(arr) <= 10^5
  • -10^9 <= arr[i] <= 10^9

示例

Example 1
Input
arr = [1, 2, 3, 4, 5]
Output
[5, 4, 3, 2, 1]
Explanation

The elements are reversed: first becomes last and last becomes first.

Example 2
Input
arr = [10, 20]
Output
[20, 10]
Explanation

Two elements swapped.

Example 3
Input
arr = [7]
Output
[7]
Explanation

Single element array reversed is the same.

Need a Hint?
考虑使用特定于数组的数据结构,例如集合或堆。
Edge Cases to Watch
  • 空输入结构
  • 单元素输入
  • 大数值范围

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