是否是有效括号(使用到栈)

2023-12-15 18:33:29

class Solution {
    public boolean isValid(String s) {
        int n = s.length();
        if (n % 2 == 1) {
            return false;
        }

        Map<Character, Character> pairs = new HashMap<Character, Character>(); 
        pairs.put(')', '(');
        pairs.put(']', '[');
        pairs.put('}', '{');
        
        Stack<Character> stack = new Stack<Character>();
        for (int i = 0; i < n; i++) {
            char ch = s.charAt(i);
            if (pairs.containsKey(ch)) {
                if (stack.isEmpty() || stack.peek() != pairs.get(ch)) {
                    return false;
                }
                stack.pop();
            } else {
                stack.push(ch);
            }
        }
        return stack.isEmpty();
    }
}

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文章来源:https://blog.csdn.net/xuehuagongzi000/article/details/135019041
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