301702: CF323A. Black-and-White Cube
Memory Limit:256 MB
Time Limit:0 S
Judge Style:Text Compare
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Solved:0
Description
Black-and-White Cube
题意翻译
给你一个k×k×k大小的立方体,它由单位立方体组成。两个单元立方体如果有共同的面孔,就被认为是相邻的。你的任务是绘制两种颜色(黑色或白色)中的每一个k×k×k大小的单元立方体,这个立方体必须满足以下条件: 1. 每个白色立方体正好有两个相邻的白色立方体; 2.每个黑色立方体正好有两个相邻的黑色立方体。题目描述
You are given a cube of size $ k×k×k $ , which consists of unit cubes. Two unit cubes are considered neighbouring, if they have common face. Your task is to paint each of $ k^{3} $ unit cubes one of two colours (black or white), so that the following conditions must be satisfied: - each white cube has exactly 2 neighbouring cubes of white color; - each black cube has exactly 2 neighbouring cubes of black color.输入输出格式
输入格式
The first line contains integer $ k $ $ (1<=k<=100) $ , which is size of the cube.
输出格式
Print -1 if there is no solution. Otherwise, print the required painting of the cube consequently by layers. Print a $ k×k $ matrix in the first $ k $ lines, showing how the first layer of the cube should be painted. In the following $ k $ lines print a $ k×k $ matrix — the way the second layer should be painted. And so on to the last $ k $ -th layer. Note that orientation of the cube in the space does not matter. Mark a white unit cube with symbol "w" and a black one with "b". Use the format of output data, given in the test samples. You may print extra empty lines, they will be ignored.
输入输出样例
输入样例 #1
1
输出样例 #1
-1
输入样例 #2
2
输出样例 #2
bb
ww
bb
ww