ARC144 D - AND OR Equation Solution 首先可以猜测和答案仅和每一个二进制位以及\(f(0)\)有关系,不妨把按位\(\operatorname{AND}\)和按位\(\operatorname{OR}\)对应到集合的运算上去,那么 \[f(A + B) = f(A \cup B) + f(A \cap B) \] 然后把每个集合拆一下,可以得到\(f(A) = \sum_{i \in A} f(\left\{i\right\}) - (|A| - 1)f(\va…

比赛标号从大到小排列 . 因为博主比较菜所以没有题解的题都是博主不会做的 /youl ARC144 以前的比赛懒得写了 . 目录 AtCoder Regular Contest 152 B. Pass on Path C. Pivot D. Halftree AtCoder Regular Contest 151 A. Equal Hamming Distances B. A < AP C. 01 Game D. Binary Representations and Queries E. Kee…