Determining if a string has all unique characters.

This problem asks us to develop an algorithm that can determine whether or not a given string has all unique characters. For example, the input string "abcdefg" would return True, while the input string "aabbcc" would return False.

Problem

```Implement an algorithm to determine if a string has all unique characters.
Example input: "abcdefg"
Example output: True
Example input: "aabbcc"
Example output: False```

Solution

This solution is in JavaScript. Our A.I. can create solutions in multiple languages.
by kayakane
```// Solution:
// The optimal solution is to use a hash table to store the characters in the string.
// The time complexity of this solution is O(n) where n is the length of the string.
// The space complexity of this solution is O(n) where n is the length of the string.

function isUnique(str) {
let hash = {};
for (let i = 0; i < str.length; i++) {
if (hash[str[i]]) {
return false;
}
hash[str[i]] = true;
}
return true;
}

console.log(isUnique("abcdefg"));
console.log(isUnique("aabbcc"));```

A.I. Evaluation of the Solution

The candidate's solution is correct and uses an efficient approach. The time complexity of the solution is O(n) and the space complexity is O(n).

Evaluated at: 2022-12-12 12:15:26