What is an efficient algorithm to removing all duplicates in a string?
For example : aaaabbbccdbdbcd
Required result: abcd
What is an efficient algorithm to removing all duplicates in a string? For example
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What is an efficient algorithm to removing all duplicates in a string?
For example : aaaabbbccdbdbcd
Required result: abcd
You use a hashtable to store currently discovered keys (access O(1)) and then loop through the array. If a character is in the hashtable, discard it. If it isn’t add it to the hashtable and a result string.
Overall: O(n) time (and space).
The naive solution is to search for the character is the result string as you process each one. That O(n2).