Check if a String Has All Unique Characters using ASCII | DSA Explained
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This explains how to determine whether a string has all unique characters using an ASCII-based approach. It notes that if the string length is greater than 128, duplicates are guaranteed and the method returns false. The implementation uses a Boolean array of size 128, iterating through the string and returning false immediately if a character has already been seen, otherwise returning true. It also discusses complexity as O(n) time and O(1) space due to the fixed-size 128 array. Examples include returning true for “A, B, C, D, 10, J, K” and false when a character like “9” appears twice.
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