roma-dxunvrs
18 lines
516 B
Markdown
18 lines
516 B
Markdown
Leetcode #771 | #Easy | [Хэш-таблицы](../../Структуры/Хэш-таблицы.md)
|
|
## Идея
|
|
Просто set
|
|
## Big-O
|
|
- Время ```O(N+M)```
|
|
- Память ```O(N)```
|
|
## Код
|
|
```Java
|
|
class Solution {
|
|
public int numJewelsInStones(String jewels, String stones) {
|
|
Set<Character> set = new HashSet<>();
|
|
for (char c : jewels.toCharArray()) set.add(c);
|
|
int res = 0;
|
|
for (char c : stones.toCharArray()) if (set.contains(c)) res++;
|
|
return res;
|
|
}
|
|
}
|
|
``` |