Hi I attempted this problem in today's contest and I am very confused about this problem and what I am doing wrong. Firstly, my code is in Java (only language i'm good enough at to attempt these tough problems), and I decided to use HashMaps to store each SINGLE letter as well as each DOUBLE letter (ex: "ab", "ba", "cp", etc.) and got their total values at the end to see which one was in the string the most. That way, I knew how many letters I could keep and just subtracted that from the total string length to find the minimum number of deletions. However, it keeps giving the wrong answer for Test Case 2, and I don't know how to make my code any better. https://codeforces.com/contest/1389/problem/C

~~~~~ import java.util.*;

public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int t = sc.nextInt();

     for (int i = 0; i < t; i++)
     {
         int max = 0;
         HashMap<String, Integer> map = new HashMap<String, Integer>();
         String cyc = sc.next();
         for (int j = 0; j < cyc.length(); j++)
         {
            String single = cyc.substring(j, j+1);

            if (j < cyc.length()-1 && !single.equals(cyc.substring(j+1,j+2)))
            {
              String doub = cyc.substring(j, j+2);
              if (map.containsKey(doub)) 
              {
                   map.replace(doub, map.get(doub)+1);
                   max = Math.max(max,  map.get(doub) *2);
              }
              else
              {
                   map.put(doub, 1);
                   max = Math.max(max,  map.get(doub) *2);
              }
            }
            if (map.containsKey(single))
            {
              map.replace(single, map.get(single)+1);
              max = Math.max(max,  map.get(single));
            }
            else
            {

              map.put(single, 1);
              max = Math.max(max,  map.get(single));
            }


         }

         int fin = cyc.length() - max;
         System.out.println(fin);
     }
}

}~~~~~