rooks彩车问题，在一个n×n 格的棋盘上放置着若干个车。按照国际象棋的规则，车可以攻击与之处在同一行或同一列上的棋子。彩车问题要求用最少颜色为给定的车着色，使棋盘的任何行和列上都没有同色的车。-rooks float problem in an n × n chessboard grid was placed on the number of cars. In accordance with the rules of chess, you can attack with car in the same row or column of pieces. Float problem with a minimum color requirements for a given vehicle color, make the board on any of the rows and columns are not the same color of the car.