UVA1674 闪电的能量 Lightning Energy Report

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=825&page=show_problem&problem=4549 [PDF](https://uva.onlinejudge.org/external/16/p1674.pdf)

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Output Format

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