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Leetcode #387 | #Easy | [O(26)](../../Методы/O(26).md) | [Хэш-таблицы](../../Структуры/Хэш-таблицы.md)
## Идея
Идея с O(26)
## Big-O
- Время ```O(N)```
- Память ```O(N)```
## Код
```Java
class Solution {
public int firstUniqChar(String s) {
int[] count = new int[26];
for (int i = 0; i < s.length(); i++) count[s.charAt(i) - 'a']++;
for (int i = 0; i < s.length(); i++) {
if (count[s.charAt(i) - 'a'] == 1) return i;
}
return -1;
}
}
```