矩阵连乘 o m[i,j]=minisksifm[i, k]+m[k+1,j]+rixrkxri), if i< nm[i]=0, if Fi m个,m1,2]m1,3m41m[个 m22m23m24m25 3, 3]m[3, 41 m[3, 51 m[441m[451 m[,51 11矩阵连乘  m[i,j] = mini≤k<j{m[i,k] + m[k+1,j] +rirkrj }, if i<j  m[i,j] = 0, if i=j 11 m[1,1] m[1,5] m[4,4] m[5,5] m[2,2] m[3,3] m[4,5] m[3,4] m[2,3] m[1,2] m[1,3] m[2,4] m[3,5] m[1,4] m[2,5]