LeetCode之Valid Parentheses
【摘要】 1、题目
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close i...
1、题目
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.
2、思路
用stack来实现,左边的进栈,如果是右边的出栈,发现没有或者不匹配就返回false
3、代码实现
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public class Solution {
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public boolean isValid(String s) {
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if (s == null || s.length() == 0) {
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return false;
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}
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char chars[] = s.toCharArray();
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Stack<Character> stack = new Stack<Character>();
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for (int i = 0; i < chars.length; ++i) {
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if (chars[i] == '(' || chars[i] == '{' || chars[i] == '[') {
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stack.add(chars[i]);
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} else {
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if (!stack.isEmpty()) {
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Character value = stack.pop();
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if (chars[i] == ')') {
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if (value != '(')
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return false;
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}
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if (chars[i] == '}') {
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if (value != '{')
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return false;
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}
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if (chars[i] == ']') {
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if (value != '[')
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return false;
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}
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} else {
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return false;
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}
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}
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}
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return stack.isEmpty();
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}
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}
文章来源: chenyu.blog.csdn.net,作者:chen.yu,版权归原作者所有,如需转载,请联系作者。
原文链接:chenyu.blog.csdn.net/article/details/77104503
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