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