18 lines
248 B
Python
18 lines
248 B
Python
import sys
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input=sys.stdin.readline
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t=int(input().rstrip())
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for _ in range(t):
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d=int(input().rstrip())
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arr=list(map(int,input().rstrip().split()))
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mx=0
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s=0
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for i in range(d):
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a=arr.pop()
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if mx<a:
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mx=a
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else:
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s+=(mx-a)
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print(s) |