Charu | Sort Array by Increasing Frequency

class Solution {
public:

    vector<int> frequencySort(vector<int>& nums) {

       vector<int> freq(201,0);

        int n = nums.size();

        for(int i=0; i<n; i++){
            freq[100+nums[i]]++;
        }
        vector<vector<int>>v;

        for(int i=0; i<201; i++){
            if(freq[i]>0)
            v.push_back({i-100,freq[i]});
        }

        sort(v.begin(),v.end(),[](vector<int> &a , vector<int> &b){
        if(a[1]==b[1]){
            return a[0]>b[0];
        }

        return a[1]<b[1];
    });

        vector<int>ans;

        for(int i = 0 ; i<v.size(); i++){
            for(int j = 0; j<v[i][1] ; j++){
                ans.push_back(v[i][0]);
            }
        }

        return ans;

    }
};