1 [servera = 4，serverb = 3，serverc = 2] server [servera = -1，serverb = 6，serverc = 4] 2 [servera = -1，serverb = 6，serverc = 4] serverb [serverra = 3，serverb = 0，serverc = 6] 3 [servera = 3，serverb = 0，serverc = 6] serverc [servera = 7，serverb = 3，serverc = -1] 4 [serverb，serverb = 3，serverc = -1]servera [servera = 2，serverb = 6，serverc = 1] 5 [servera = 2，serverb = 6，serverc = 1] serverb [servera = 6，serverb = 0，serverc = 3] 6serverb = 0，serverc = 3]server [servera = 1，serverb = 3，serverc = 5] 7 [servera = 1，serverb = 3，serverc = 5] serverc [servera = 5，serverc = -2]
