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public static int countUniqueCharacterSets(int N, String A) {
        Set<Set<Character>> uniqueSets = new HashSet<>();
       
        for (int i = 0; i < N; i++) {
            Set<Character> currentSet = new HashSet<>();
            for (int j = i; j < N; j++) {
                currentSet.add(A.charAt(j));
                uniqueSets.add(new HashSet<>(currentSet)); 
            }
        }
       
        return uniqueSets.size();
    }

Character Set Count โœ