ValidParenthesis

import java.util.Stack;

public class ValidParentheses {
    public boolean isValid(String s) {
        Stack<Character> stack = new Stack<>();
        for (char c : s.toCharArray()) {
            if (c == '(' || c == '{' || c == '[') {
                stack.push(c);  // Push opening brackets onto the stack
            } else {
                if (stack.isEmpty()) {
                    return false;  // No matching opening bracket
                }
                char top = stack.pop();
                // Check if the closing bracket matches the last opened bracket
                if ((c == ')' && top != '(') || 
                    (c == '}' && top != '{') || 
                    (c == ']' && top != '[')) {
                    return false;
                }
            }
        }
        return stack.isEmpty();  // Check if all opening brackets are matched
    }

    public static void main(String[] args) {
        ValidParentheses solution = new ValidParentheses();
        String s = "([]{})";
        System.out.println("Is valid: " + solution.isValid(s)); // Output: true
    }
}