2531. Make Number of Distinct Characters Equal

class Solution {
    public boolean isItPossible(String word1, String word2) {
        int[] occ1 = findOccurance(word1);
        int[] occ2 = findOccurance(word2);

        for(int i=0;i<26;i++){
            if(occ1[i]>0){
                for(int j=0;j<26;j++){
                    if(occ2[j]>0){
                        swap(occ1,occ2,i,j);
                        if(areDistinctEqual(occ1,occ2)){
                            return true;
                        }
                        swap(occ1,occ2,j,i);
                    }
                }
            }
        }
        return false;
    }

    private boolean areDistinctEqual(int[] occ1,int[] occ2){
        int count=0;
        for(int i=0;i<26;i++){
            if(occ1[i]>0) count++;
            if(occ2[i]>0) count--;
        }
        return count==0;
    }

    private void swap(int[] occ1,int[] occ2,int i,int j){
        occ1[i]--;
        occ2[i]++;
        occ1[j]++;
        occ2[j]--;
    }

    private int[] findOccurance(String word){
        int[] occurance = new int[26];
        for(char c:word.toCharArray()){
            occurance[c-'a']++;
        }
        return occurance;
    }
}