Leetcode Problem 39. Combination Sum

39. Combination Sum

Leetcode Solutions

Define a helper function backtrack that takes the remaining target (remain), the current combination (comb), and the starting index (start).
If remain is zero, add the current combination to the result list, as it satisfies the target sum.
If remain is negative, return, as the current combination exceeds the target.
Iterate over the candidates starting from the start index.
For each candidate, add it to the current combination and recursively call backtrack with the updated remain and start.
After exploring with the current candidate, backtrack by removing the candidate from the current combination.
Continue the process until all combinations have been explored.

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