Letter Combinations of a Phone Number leetcode 17 FAANG coding interview question Recursive solution

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Letter Combinations of a Phone Number leetcode 17 FAANG coding interview question Recursive Backtracking solution.
0:00 Read the problem
0:38 Example
0:54 Coding and explanation side by side
4:52 Time complexity analysis
6:16 Understanding the recursive calls

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Coding interview question asked by companies like Amazon, Apple, Google, Facebook, Microsoft, eBay etc

Complexity O(n * n^4)
where 'n' is the length of the input string.

Backtracking can be defined as a general algorithmic technique that considers searching every possible combination in order to solve a computational problem.
~ Wiki

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In this video we will solve this problem using the recursion & backtracking based approach. Please leave a comment if any aspect of this video was not clear.
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