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Tidal Melody Chorus

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Imagine a sea song that changes depending on which coves join the chorus. You always have one main line called the refrain, and then the cove names wrap around it in a special pattern.

If there are no coves, the answer is simple: the chorus is just the refrain by itself. If there is one cove, the pattern becomes Lead, then the refrain, then Echo, then the refrain again, and finally Release. With more than one cove, the pattern becomes nested, almost like opening one musical box inside another.

That is why this problem is more than just joining strings together. You need to build the chorus in the right order so every cove opens, echoes, and closes at the correct time. The examples show that when two coves are used, the smaller chorus for one cove can appear inside the bigger chorus for another.

The final answer is a list of chorus lines in exact order. If one line appears too early, too late, or too few times, the whole pattern is wrong. So the most important thing is keeping the nesting order correct from the first Lead to the last Release.

Example Input & Output

Example 1
Input
refrain = "Hold position on the eastern bar.", coves = []
Output
["Hold position on the eastern bar."]
Explanation

Example with input: refrain = "Hold position on the eastern bar.", cov

Example 2
Input
refrain = "Hold position on the eastern bar.", coves = ["Harrowside"]
Output
["Lead: Harrowside", "Hold position on the eastern bar.", "Echo: Harrowside", "Hold position on the eastern bar.", "Release: Harrowside"]
Explanation

Example with input: refrain = "Hold position on the eastern bar.", cov

Example 3
Input
refrain = "Anchor near the copper reefs.", coves = ["Marlon", "Sera"]
Output
["Lead: Marlon", "Lead: Sera", "Anchor near the copper reefs.", "Echo: Sera", "Anchor near the copper reefs.", "Release: Sera", "Echo: Marlon", "Lead: Sera", "Anchor near the copper reefs.", "Echo: Sera", "Anchor near the copper reefs.", "Release: Sera", "Release: Marlon"]
Explanation

Example with input: refrain = "Anchor near the copper reefs.", coves =

Algorithm Flow

Recommendation Algorithm Flow for Tidal Melody Chorus
Recommendation Algorithm Flow for Tidal Melody Chorus

Best Answers

java
class Solution {
    public int count_melody_vowels(String s) {
        int count = 0; String v = "aeiouAEIOU";
        for (char c : s.toCharArray()) if (v.indexOf(c) != -1) count++;
        return count;
    }
}