如题所述
第1个回答 2020-07-09
建议还是用枚举法,直接算过于复杂了：
c(8 1) = 8/1 = 8
c(8 2) = 8*7/(2*1) = 28
c(8 3) = 8*7*6/(3*2*1) = 56
c(8 4) = 8*7*6*5/(4*3*2*1) = 70
c(8 5) = c(8 3) = 56
...
因此 n=4
c(8 1) = 8/1 = 8
c(8 2) = 8*7/(2*1) = 28
c(8 3) = 8*7*6/(3*2*1) = 56
c(8 4) = 8*7*6*5/(4*3*2*1) = 70
c(8 5) = c(8 3) = 56
...
因此 n=4
