10 lines
278 B
Python
Executable file
10 lines
278 B
Python
Executable file
#!/usr/bin/env python3
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for _ in range(int(input())):
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input()
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a, d = ([int(i) for i in input().split()] for _ in range(2))
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a.extend((a[0], a[-1]))
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try:
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print(max(d for i, d in enumerate(d) if d > a[i-1] + a[i+1]))
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except ValueError:
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print(-1)
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