8.2
Solve the problem of the evolution matrix. Use vector function engaged for a long time. Later, instead of multiplying quickly. But when they found the owl into the data of the count more. . . I do not know why, ask the original take someone else's b [i] has not changed, with c [i] is no way to achieve, and then still use a variable to temporarily store it. Finally it took a long time considered it. Obviously, there is the task when more motivated and more efficient. So give yourself to set goals.