classSolution {

List<int>topKFrequent(List<int> nums,int k) {

Map<int,int> frequencyMap= {};

for (intnumin nums) {

frequencyMap[num]= (frequencyMap[num]??0)+1;

}

List<List<int>> frequencyList=

List.filled(nums.length+1,List<int>.empty(growable:true));

frequencyMap.forEach((num, count) {

frequencyList[count]= [...frequencyList[count],num];

});

List<int> res= [];

for (var i= frequencyList.length-1; i>=0; i--) {

res.addAll(frequencyList[i]);

if (res.length== k) {

break;

}

}

return res;

}

}