→ mickeyha:我瞬間懂了XD 拓樸排序所以可任選1,2,4,872的中間插入3,9 01/31 23:32
→ metalalive:yes XD 01/31 23:46
How many total orders are there on the set S = {1,2,4,8,3,9,72}
which are compatible with the divisibility relation on S ?
答案為C(4+2-1,2)
我看不懂這樣的解法...
請高手解釋 謝謝:)
--
Why Not ：-P
http://whynot-p.blogspot.com/
是的我是江米奇別再在宿舍走廊上問我了>////<
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 1.162.56.82