What is a time complexity for finding all the tandem repeats?

(a) Ɵ (n)

(b) Ɵ (n!)

(c) Ɵ (1)

(d) O (n log n + z)

Query is from Suffix tree topic in chapter Trie of Data Structures & Algorithms I

The question was posed to me at a job interview.

1 Answers

The correct option is (a) Ɵ (n)

Best explanation: Tandem Repeats are formed in DNA when the nucleotides pattern repeats more than once. To check if a substring is present in a string of a length of n, the time complexity for such operation is found to be O (n). The time complexity for finding all the tandem repeats in a string is O (n log n + z).