15 lines
257 B
Python
15 lines
257 B
Python
t = int(input())
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for _ in range(t):
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sequence = list(map(int, input().split()))[:-1]
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prev_s = 1
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lb_import = 0
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for s in sequence:
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if s > (prev_s * 2):
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lb_import += s - prev_s * 2
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prev_s = s
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print(lb_import)
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