Backtracking Template : Combination Sum III | September Leetcode challenge Day 12 | Leetcode 216

Quick Links
1) 0:00 Stating the problem out loud
2) 2:10 Constraint highlighted/Why using sets
3) 3:10 Why backtracking
5) 3:46 Coding it up
6) 9:40 How is it backtracking
7) 10:00 Improving the time complexity

Solution

[sripadtallapragada]

Excellent Explanation Sir! Thank you very much

[arnabmishra]

kudos to the explanation. Can you make one video on deriving the time complexity of such algorithm

[msudha]

Hi Sir, I have a doubt actually in for loop after i =9 then i =10 <=9 it comes out of for loop right then why again it goes to combinationSum3Helper(ans, noOfElements-1, remainingSum- i, i+1);