1207. Unique Number of Occurrences.cpp

class Solution {
public:
    bool uniqueOccurrences(vector<int>& arr) {
        vector<int> ans;
        int size = arr.size();
        int i = 0;
        sort(arr.begin(),arr.end());
        while(i < size){
            int count = 1;
            for(int j = i + 1; j < size; j++){
                if(arr[i] == arr[j]) count++;
                else break;
            }
            ans.push_back(count);
            i = i + count;
        }
        size = ans.size();
        sort(ans.begin(),ans.end());
        for(int i = 0; i < size - 1; i++){
            if(ans[i] == ans[i + 1])
                return false;
        }
        return true;   
    }
};