UPC LED 二分

問題 E: LED 時間限制: 2 Sec  內存限制: 512 MB 提交: 429  解決: 63 [提交] [狀態] [命題人:admin] 題目描述 A Light-Emitting Diode (LED) is a semiconductor light source, which emits light when an electric current of voltage highe

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