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CheezItMan
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May 29, 2019
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Outstanding, you had nearly all the methods done in ideal time complexity and had pretty accurate Big-O predictions. You hit all learning goals.
| def reverse(s) | ||
| raise NotImplementedError, "Method not implemented" | ||
| return "" if s.empty? | ||
| return s[-1] << reverse(s[0...-1]) |
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Technically s[0...-1] creates a new string of length n-1, so this algorithm is actually n^2
| # Space complexity: ? | ||
| def reverse_inplace(s) | ||
| raise NotImplementedError, "Method not implemented" | ||
| # Time complexity: O(n) where is the number of chars in the string |
| def nested(s, left = 0, right = nil) | ||
| right ||= s.length - 1 | ||
| return true if left >= right | ||
| return false if s.length.odd? || s[right] == s[left] |
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