How should I practice Shift Every K-th Consonant?

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Problem · String

Shift Every K-th Consonant

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Problem statement

You are implementing a simple substitution cipher that affects only consonant characters in a string memo.

Read the consonants in memo from left to right. Every k-th consonant is shifted to the following consonant in the alphabet, while vowels and all other characters remain unchanged. In other words, consonants numbered k, 2 * k, 3 * k, and so on are shifted.

The consonants are b, c, d, f, g, h, j, k, l, m, n, p, q, r, s, t, v, w, x, y, and z.
When shifting from z, wrap around to b.
Preserve the case of every shifted character.

Return the transformed memo.

A solution with time complexity no worse than O(memo.length^2) will fit within the execution time limit.

Function

solution(memo: String, k: int) → String

Examples

Example 1

memo = "CodeSignal"k = 3return = "CodeTignam"

The consonants are C, d, S, g, n, and l. The third consonant S shifts to T, and the sixth consonant l shifts to m.

Example 2

memo = "Quiz, Citizenship, puZZle"k = 5return = "Quiz, Citibenship, quZZle"

The fifth consonant is the lowercase z in Citizenship, so it wraps to b. The tenth consonant is the first p in puZZle, so it shifts to q.

Problem statement

Function

Examples

Example 1

Example 2

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