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京东 11.11 红包
Educational Codeforces Round 160 (Rated for Div. 2)(A-D)(思路讲解)
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ef待补。 A题:希望b最大,也就是遇到非0,后面都是b的,可以转化为整数去比较。 B题:注意到0和1没有位置区别,删除点,实际上是最后一个位置不用匹配。 C题:我们寻找值的构造是log级别的,所以我们可以直接从低位维护,再把多出的值除2传到高位。 D题:使用单调栈前缀和优化dp,注意到一次操作长度为2一定最优,我们可以记录以i结尾的方案和不以i结尾的方案数,思考其转移过程,这题方案数的重复计算非常难以去重,很容易算错,建议画图理解,也很抱歉讲的不太好,水平有限。
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