ValidParentheses.java ( File view )

  • By issaczr 2014-10-24
  • View(s):52
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  • Point(s): 1
			// Author:   Li Long, 1988lilong@163.com
// Date:     Apr 17, 2014
// Source:   http://oj.leetcode.com/problems/valid-parentheses/
// Analysis: http://blog.csdn.net/lilong_dream/article/details/21694751

// 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 ValidParentheses {

	public boolean isValid(String s) {

		if (s.length() == 0) {

			return true;
		
}

		Stack<Character> st = new Stack<Character>();
		st.push(s.charAt(0));

		for (int i = 1; i < s.length(); ++i) {

			if (!st.empty() && isMatch(st.peek(), s.charAt(i))) {

				st.pop();
			
}
			else {

				st.push(s.charAt(i));
			
}
		
}
		
		if(st.empty()) {

			return true;
		
}

		return false;
	
}

	public boolean isMatch(char s, char p) {

		if ((s == '(' && p == ')') || (s == '{
' && p == '
}')
				|| (s == '[' && p == ']')) {

			return true;
		
}

		return false;
	
}

	public static void main(String[] args) {

		ValidParentheses slt = new ValidParentheses();
		String s = "(]";
		System.out.println(slt.isValid(s));
	
}

}			
...
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