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void pushZerosAtEnd(vector<int> &arr)
{
// Write your code here.
int nonzeroindex=0;
for(int i=0;i<arr.size();i++){
if(arr[i]!=0){
arr[nonzeroindex++]=arr[i];
}
}
while(nonzeroindex<arr.size()){
arr[nonzeroindex++]=0;
}
}