3ms/556.00KB AC #1 Accepted, 得分 20.ok accepted 3ms/572.00KB AC #2 Accepted, 得分 20.ok accepted 3ms/564.00KB AC #3 Accepted, 得分 20.ok accepted 3ms/552.00KB AC #4 Accepted, 得分 20.ok accepted 3ms/564.00KB AC #5 Accepted, 得分 20.ok accepted