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I recently had an interview question that went something like this:
Given a large string (haystack), find a substring (needle)?
I was a little stumped to come up with a decent solution.
What is the best way to approach this that doesn't have a poor time complexity?
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The IndexOf method returns the location of the first character of the first occurrence of the substring. The index is 0-based, which means the first character of a string has an index of 0. If IndexOf does not find the substring, it returns -1.
Z algorithm is an algorithm for searching a given pattern in a string. It is an efficient algorithm as it has linear time complexity. It has a time complexity of O(m+n), where m is the length of the string and n is the length of the pattern to be searched.
Results: The Boyer-Moore-Horspool algorithm achieves the best overall results when used with medical texts. This algorithm usually performs at least twice as fast as the other algorithms tested. Conclusion: The time performance of exact string pattern matching can be greatly improved if an efficient algorithm is used.
What is String? Strings are defined as an array of characters. The difference between a character array and a string is the string is terminated with a special character '\0'.
I like the Boyer-Moore algorithm. It's especially fun to implement when you have a lot of needles to find in a haystack (for example, probable-spam patterns in an email corpus).
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