Codeforces Round #540 (Div. 3)(部分題解)

鏈接:http://codeforces.com/contest/1118 來源:Codeforces 文章目錄 A. Water Buying B. Tanya and Candies(前綴和) D1. Coffee and Coursework (Easy version)(貪心) D2. Coffee and Coursework (Hard Version)(二分) A. Water Bu

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