feat: added AllUniques program in Strings #118
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What's being changed:
Added a new program under Strings section.
Problem: To implement an algorithm to determine if a string has all unique characters.
Solution: Have an array of boolean values where every value acts like a flag at ith index and it also shows whether that character value is contained in the given string. The next time that character appears, we return false.
Time Complexity: O(n)
Checkoff the following:
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