20. Valid Parentheses
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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.
import java.util.Stack;public class Solution { public boolean isValid(String s) { Stack<Character> stack = new Stack<Character>(); //使用foreach循环 for (char c : s.toCharArray()) { if (c == '(') stack.push(')'); else if (c == '{') stack.push('}'); else if (c == '[') stack.push(']'); else if (stack.isEmpty() || stack.pop() != c) return false; } return stack.isEmpty(); }}阅读全文
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