Strobogrammatic Number I, II, III | Leetcode Locked

Strobogrammatic Number I, II, III | Leetcode Locked

Strobogrammatic Number I, II, III

Question

A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down).

Write a function to determine if a number is strobogrammatic. The number is represented as a string.

For example, the numbers "69", "88", and "818" are all strobogrammatic.

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The following is the C++ implementation of the suggested solution using a look-up table (implemented as an unordered_map). It takes 0 ms. But, I wonder, are there any real applications of strobogrammatic numbers?

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