UPC LED 二分

问题 E: LED 时间限制: 2 Sec  内存限制: 512 MB 提交: 429  解决: 63 [提交] [状态] [命题人:admin] 题目描述 A Light-Emitting Diode (LED) is a semiconductor light source, which emits light when an electric current of voltage highe

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