Python 基础知识简单

从数组中删除重复元素

“从数组中删除重复元素”问题的详细指南和 Python 实现。

问题陈述

简单

编写一个函数 remove_duplicates(arr) ,它接受整数列表 arr 并返回一个删除重复元素的新列表,保留每个元素第一次出现的顺序。

约束条件
  • 0 <= len(arr) <= 10^5
  • -10^6 <= arr[i] <= 10^6

示例

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

Remove the second 2 and second 4, keeping first occurrences in order.

Example 2
Input
arr = [5, 5, 5, 5]
Output
[5]
Explanation

All duplicates removed, keeping only one 5.

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

No duplicates, array unchanged.

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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