ARC109E 1D Reversi Builder

一排格子，每个格子黑白颜色\(c_i\)。一开始从某个位置\(s\)开始，\(s\)上放颜色\(c_i\)的棋子。每次选择一个和有棋子格子相邻的空格子\(x\)，放颜色为\(c_x\)的棋子，并找到离 ...