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Find Common Elements

Python Easy 20 views
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Practice Python set operations to efficiently handle unique elements and perform mathematical set operations. You will work with multiple collections to find intersections, unions, and differences using Python built-in set data structure.

Your goal is to leverage set operations to solve problems involving uniqueness and membership testing. Sets provide O(1) average-case lookup time, making them ideal for these operations.

Example 1:

Input: list1 = [1, 2, 3, 4], list2 = [3, 4, 5, 6]
Output: [3, 4]
Explanation: Find common elements (intersection).

Example 2:

Input: items = [1, 2, 2, 3, 3, 3, 4]
Output: [1, 2, 3, 4]
Explanation: Get unique elements only.

Example 3:

Input: list1 = [1, 2, 3], list2 = [2, 3, 4]
Output: [1]
Explanation: Find elements only in list1 (difference).

Algorithm Flow

Recommendation Algorithm Flow for Find Common Elements - Budibadu
Recommendation Algorithm Flow for Find Common Elements - Budibadu

Best Answers

python - Approach 1
def find_common(list1, list2):
    s1 = set(list1)
    s2 = set(list2)
    return list(s1 & s2)