int maxProductDifference(vector<int>& nums) {
sort(nums.begin(),nums.end());
int a=nums.size()-1;
int ans=(nums[a]*nums[a-1])-(nums[0]*nums[1]);
return ans;
}
int maxProductDifference(vector<int>& nums) {
sort(nums.begin(),nums.end());
int a=nums.size()-1;
int ans=(nums[a]*nums[a-1])-(nums[0]*nums[1]);
return ans;
}