Valid Parentheses

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

An input string is valid if:

1. Open brackets must be closed by the same type of brackets.
2. Open brackets must be closed in the correct order.
3. Every close bracket has a corresponding open bracket of the same type.

 

Example 1:

Input: s = "()"
Output: true

Example 2:

Input: s = "()[]{}"
Output: true

Example 3:

Input: s = "(]"
Output: false

 

Constraints:

• 1 <= s.length <= 104
• s consists of parentheses only '()[]{}'.

---

class Solution {
    public boolean isValid(String s) {
        int max=s.length()/2;
        if (s.length()%2==1) return false;
        System.out.println(s.length());
        for (int i=0; i<max; i++){
            s=s.replace("[]","");
            s=s.replace("()","");
            s=s.replace("{}","");
        }
        System.out.println(s);
        if (s.equals("")) return true;
        return false;
    }
}