+ محدودیت زمان: ۱ ثانیه + محدودیت حافظه: ۲۵۶ مگابایت ----------  Amin has given an array of $n$ distinct numbers, $a_1, a_2, \dots, a_n$ to Niloufar. She came and calculated the value $\max(a_i, a_j) \times |a_i - a_j|$ for each two-element subset $\{ a_i, a_j \}$ and wrote it on the board. Now Amin wants to calculate the sum of the numbers written on the board. Help him perform this calculation. # ورودی The first line of input contains a positive integer $t$, representing the number of test cases. $$1 \leq t \leq 100$$ In the first line of each test case, there is an integer $n$ indicating the number of elements in the array. $$2 \leq n \leq 5 \times 10^4$$ The second line of each test case contains $n$ positive integers, representing the elements of the array. $$1 \leq a_i \leq 5 \times 10^4$$ **Note that the input array is not necessarily sorted.** # خروجی For each test case, print a single integer representing the sum of the numbers written on the board. # مثال‌ها ## ورودی نمونه ۱ ``` 3 2 1403 9 4 2 1 4 3 7 10 20 3 15 1000 60 16 ```` ## خروجی نمونه ۱ ``` 1955782 35 5891525 ````

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