Two players X and O play a game with
Starting with X, they make moves in turn. At X's turn, X draws an "X" symbol; at O's turn, O draws an "O" symbol.
The symbol must be drawn in one blank square with either red or blue pen, subject to the following restrictions:
two symbols in adjacent squares on one strip must be different symbols and must have different colour;
if there is at least one blank strip, then one must draw on a blank strip.
Whoever does not have a valid move loses the game.
Let
For example,
Find
小叉和小圈正用
由小叉先手,二人轮流操作。小叉的回合中,他需画下一个 "X";小圈的回合中,他需画下一个 "O";这些符号需用红笔或蓝笔,绘制在任意一个空白方格上,并满足下述要求:
同一纸带上相邻格子中的两个符号必须不同,且 他们的颜色也必须不同。
如果至少有一张完全空白的纸带,那么玩家只能把符号绘制在完全空白的纸带上。
无法操作者落败。
记
例如有
求
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