announce the list: Absolute CinemaTwo moviesBeautiful Triple Pairs

Absolute cinema

second order difference. The key point is that the value of a1 and an. We construct and then . Same for .

Two movies

Greedy. One point is that when the (0,0) or (0,-1), we can ignore this case, because we always choose 0. And finally we allocate the (1,1) and (-1,-1).

Beautiful Triple Pairs

We learn a new , beautiful way to select. We construct the corresponds.