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请教有关如何使循环次数变小(内详)

Posted by leoyonn at 2005-05-11 11:05:50 on Problem 1026
例如n = 4;
   3 1 2 4     4 1 3 2     3 4 1 2
   A B C D     A B C D     A B C D
一 B C D A     B D C A     D C A B
二 C A B D     D A C B     B A D C
三 A B C D     A B C D     C D B A
四                         A B C D
虽然跟k没有关系,但我不能看出到底循环能多少次,请教ing……

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