求翻译：（1）定义状态Sk=（Xk,Yk）.Sk表示第k次过河时此岸商人数为Xk，随从数为Yk.则若保证商人安全，则(Xk,Yk)可取值为Xk=0，Yk=0,1,2,3；Xk=3,Yk=0,1,2,3;Xk=Yk=1,2.是什么意思？

(1) define the state sk = (xk, yk) sk said k-times across the river on this side provider number xk, entourage for yk. Then ensure that the merchant security, (xk, yk) is preferable to the value of xk = 0 , yk = 0,1,2,3; xk = 3, yk = 0,1,2,3; xk = yk = 1,2.

(1) Custom Status Sk = (Xk Yk), and that the first k Sk . time when crossing a river in the cross-strait business Xk Yk, Entourage for, if that business people, security, and the ( ) Yk Xk, desirable value to Xk Yk = = 0, 0, 1, 2, 3; Xk Yk = = 3, 0, 1, 2, 3; Xk = Yk = 1, 2.

(1) definition condition Sk=(Xk, Yk).Sk expressed kth time crosses river when this shore merchant counts is Xk, accompanies the number is Yk. if then guarantees the merchant safety, then (Xk, Yk) may the value be Xk=0, Yk=0,1,2,3; Xk=3, Yk=0,1,2,3; Xk=Yk=1,2.

(1) defined State Sk= (Xk,Yk). Sk number numu.CN when you said k River for Xk, follow number is Yk. guarantee the security traders, then (Xk,Yk) desirable value of Xk=0,Yk=0,1,2,3;Xk=3,Yk=0,1,2,3; Xk=Yk=1,2.

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