How can we decode strings like "3[a2[c]]" into their expanded form?
In this video, we solve LeetCode 394 β Decode String using stack-based logic in C++.
What youβll learn
β How to decode nested brackets using a stack
β Why two stacks (for strings and numbers) simplify the logic
β Clean, readable C++ implementation step by step
Time complexity: O(n)
Space complexity: O(n)
Timestamps
0:00 β Problem explanation
0:45 β Example walkthrough
2:00 β Stack-based decoding logic
4:00 β Full C++ solution
5:30 β Final notes
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