We can save time, go back fast and high probability to win.If we need n steps,big n,to fix a box or guess,this method is good.
A52=4,we can fix A12,A54,A58,A52=7only A12.
回答: 回复:A52=4 or 7, how do you know it is 4? Guess and try or some lo
由 wxcfan123
于 2011-10-04 06:55:56