How to realize the combination Sum of Python

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Title

Given an array candidates without repeating elements and a target number target, find all the combinations in candidates that can make the sum of numbers target.

Numbers in candidates can be selected indefinitely.

Description:

All numbers, including target, are positive integers.

The solution set cannot contain duplicate combinations.

Example 1:

Input: candidates = [2pj3je 6je 7], target = 7, the solution set is: [[7], [2je 2je 3]]

Example 2:

Input: candidates = [2jue 3jue 5], target = 8, the solution set is: [2meme 2je 2jue 2], [2je 3je 3], [3je 5]

Tip:

one