摘要:
Problem Description Zero has an old printer that doesn't work well sometimes. As it is antique, he still like to use it to print articles. But it is t 阅读全文
摘要:
题目描述 多米诺骨牌有上下2个方块组成,每个方块中有1~6个点。现有排成行的 上方块中点数之和记为S1,下方块中点数之和记为S2,它们的差为|S1-S2|。例如在图8-1中,S1=6+1+1+1=9,S2=1+5+3+2=11,|S1-S2|=2。每个多米诺骨牌可以旋转180°,使得上下两个方块互换 阅读全文