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京东 11.11 红包
Codeforces Round 928 (Div. 4)(A-G)(思路讲解)
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A题:记录ab数量就行。 B题:找左上的点,然后向下和向右走就可以判断是不是正方形了。 C题:预处理出所有值的答案,然后每次询问直接查询答案就行。 D题:一组最多两个数字,且知道一个数字剩下一个唯一,也就是异或起来为2^31-1,可以算么个。 E题:本质上也只有1,2,4,8...以及后面2的倍数才会删掉新的数字,也就是二进制下1结尾,10结尾,100结尾,依次类推。 F题:分成两个图,每个图最多操作四次,暴力判断。 G题:树上的dp,dpi为i的子树操作合法的情况。
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