KirinSB

摘要： 题意： n个点，分成两组A，B，如果点i在A中，那么贡献值$a_i$，反之为$b_i$。 现要求任意$i \in A，j \in B$不存在 $x_i = x_j$ 且 $y_i include include include include include include include incl 阅读全文