roma-dxunvrs
21 lines
681 B
Markdown
21 lines
681 B
Markdown
Leetcode #20 | #Easy | [Стек](../../Структуры/Стек.md) | [Хэш-таблицы](../../Структуры/Хэш-таблицы.md)
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## Идея
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Стек
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## Big-O
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- Время ```O(N)```
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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 boolean isValid(String s) {
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Map<Character, Character> map = Map.of(')', '(', ']', '[', '}', '{');
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Deque<Character> stack = new ArrayDeque<>();
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for (char c : s.toCharArray()) {
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if (map.containsKey(c)) {
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if (stack.isEmpty() || stack.pop() != map.get(c)) return false;
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} else stack.push(c);
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}
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return stack.isEmpty();
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}
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}
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``` |