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.
解析：利用栈的后进先出特点
public class Solution { public boolean isValid(String s) { if (s.length() % 2 != 0) { return false; } char[] sArr = s.toCharArray(); HashMap<Character, Character> hm = new HashMap<Character, Character>(); hm.put(')','('); hm.put('}','{'); hm.put(']','['); Stack<Character> st = new Stack<Character>(); for(char c : sArr) { if (!hm.containsKey(c)) { st.push(c); } else { if (st.isEmpty() || st.pop() != hm.get(c)) { return false; } } } return st.isEmpty(); }} 0 0
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