12 lines
273 B
Python
12 lines
273 B
Python
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for i in range(int(input())):
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n = int(input())
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dists = sorted([int(i) for i in input().split()])
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weights = 0
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prev = 0
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for i, w in enumerate(dists):
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weights += w - prev
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weights -= (i*(n-i))*(w - prev)
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prev = w
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print(weights)
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