Python 基礎知識簡單

從陣列中刪除重複元素

「從陣列中刪除重複元素」問題的詳細指南和 Python 實作。

問題陳述

簡單

寫一個函數 remove_duplicates(arr) ,它接受整數列表 arr 並傳回一個刪除重複元素的新列表,保留每個元素第一次出現的順序。

約束條件
  • 0 <= len(arr) <= 10^5
  • -10^6 <= arr[i] <= 10^6

範例

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?
考慮使用特定於數組的資料結構,例如集合或堆。
Edge Cases to Watch
  • 空輸入結構
  • 單元素輸入
  • 大數值範圍

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