1.p149 f(i,j) = f(i-1,j-1)+f(i-1,j)*(i-1) 应该改为f(i,j) = f(i-1,j-1)*(i-1)+f(i-1,j)——————————————————————————————
1.p149 f(i,j) = f(i-1,j-1)+f(i-1,j)*(i-1) 应该改为f(i,j) = f(i-1,j-1)*(i-1)+f(i-1,j)——————————————————————————————...