Interleave Three Equal-Length Strings

Question

Given three strings of equal length, the task is to interleave them into a single string by taking one character from each string sequentially.

Codemia · Accepted Answer

To interleave three equal-length strings, we will iterate through the strings character by character. For each index, we will append the corresponding characters from each string to a result string.

The algorithm can be implemented as follows:
1. Initialize an empty result string.
2. Loop through the indices from 0 to the length of the strings.
3. In each iteration, append the character from each string at the current index to the result string.
4. Return the result string after the loop completes.

The time complexity of this approach is O(n), where n is the length of the input strings. This is because we are iterating through the strings once. The space complexity is also O(n) due to the storage of the result string.

Here is a sample implementation in Python:
```python
def interleave_strings(str1, str2, str3):
    result = ''
    length = len(str1)
    for i in range(length):
        result += str1[i] + str2[i] + str3[i]
    return result
```
This code takes three strings as input and constructs the interleaved result.

It's important to consider edge cases such as when the input strings are empty. In such cases, the function should return an empty string. Additionally, since the problem states that all strings are of equal length, we do not need to handle cases with differing lengths.

Interleave Three Equal-Length Strings

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