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京东 11.11 红包
Codeforces Round 924 (Div. 2)(A-E)(思路讲解)
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A题:枚举出所有矩形比较一下。 B题:排序一下,跑滑动窗口。 C题:2k-2一个循环,写出关系式,然后变为分前后两段,找因子。 D题:一个ci的种族,最多只有ci个情况要算,所以暴力的复杂度是sum_ci的,每次分配平均分配最优,当然总函数先单增后单减,也可以跑三分。 E题:dp跑出k个y最少多少个位置,然后再枚举前面部分用多少个,考虑转移,找到转移点转移回去,再构造出来。
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