Leetcode_2696.java

import java.util.Stack;

public class Leetcode_2696 {
 public int minLength(String s) {
 Stack<Character> st = new Stack<>();

 for (int i = 0; i < s.length(); i++) {
 if (s.charAt(i) == 'B') {
 if ((!st.isEmpty()) && (st.peek() == 'A')) {
 st.pop();
 continue;
 }
 }
 if (s.charAt(i) == 'D') {
 if ((!st.isEmpty()) && (st.peek() == 'C')) {
 st.pop();
 continue;
 }
 }
 st.push(s.charAt(i));
 }
 return st.size();
 }
 public static void main(String[] args) {
 Leetcode_2696 obj = new Leetcode_2696();
 System.out.println(obj.minLength("ABFCACDB"));
 }
}