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Yes, variations of string repetition and manipulation problems appear in coding interviews, especially for entry-level or easy rounds. They test familiarity with string handling and efficiency considerations.
The optimal approach is to use a language-provided repeat function or a string builder to append the string multiple times efficiently. This avoids repeated reallocation that occurs with naive string concatenation.
A string builder or similar mutable string structure is typically the best choice. It allows efficient appending of characters or strings without creating many intermediate string objects.
The time complexity is usually O(n × k), where n is the length of the original string and k is the number of repetitions. This reflects the total size of the output string that must be constructed.
