UPC6604: Sandglass(思惟)

6604: Sandglass 時間限制: 1 Sec  內存限制: 128 MB 提交: 312  解決: 66 [提交] [狀態] [討論版] [命題人:admin]php 題目描述node We have a sandglass consisting of two bulbs, bulb A and bulb B. These bulbs contain some amount of san
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