Decoded String at Index - LeetCode 880 - Python

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Solution, explanation, and complexity analysis for LeetCode 880, the problem of the day for September 27th, in Python.

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After 4 hours understanding the solutions on the Leetcode, eventually watch this and find the lightbulb moment. I feel like I'm the dumbest leetcoder in the world :') But thanks.

But I think, it's not essentially an "out of the world" problem. It's just that I haven't seen any problem like this before. When I first learning Permutations, it feels so alien to me but then I was able to digest and solve similar problems. Hopefully this one is also the same.

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What genre does this question fall under? Why is it important that we go backwards and what gave it away?

SmoothCode