挺水的，简单按照题意模拟就行

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 1 #include <iostream>

 2 #include <string.h>

 3 using namespace std;

 4 int w2[3]={

0,1,2};

 5 int w3[3]={

3,4,5};

 6 int w4[3]={

6,7,8};

 7 int w5[3]={

9,10,11};

 8 int w6[3]={

12,13,14};

 9 int w7[4]={

15,16,17,18};

10 int w8[3]={

19,20,21};

11 int w9[4]={

22,23,24,25};

12 int wc[26]={

3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,3,3,3,4,4,4,4};

13 int wp[26]={

0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,3,0,1,2,0,1,2,3};

14 char w[100];

15 int main()

16 {

17         cin>>w;

18         while(strcmp(w,"#")!=0)

19         {

20                 int len=strlen(w);

21                 for(int i=0;i<len;i++)

22                 {

23                         int* tem;

24                         int c;

25                         if(w[i]>='A'&&w[i]<='Z')

26                                 c=w[i]-'A';

27                         if(w[i]>='a'&&w[i]<='z')

28                                 c=w[i]-'a';

29                 //    cout<<w[i]<<c<<endl;

30                         int n=wc[c];

31                 //    cout<<n<<endl;

32                         int p=wp[c];

33                 //    cout<<p<<endl;

34                         if(c<=2)

35                                 tem=w2;

36                         else if(c<=5)

37                                 tem=w3;

38                         else if(c<=8)

39                                 tem=w4;

40                         else if(c<=11)

41                                 tem=w5;

42                         else if(c<=14)

43                                 tem=w6;

44                         else if(c<=18)

45                                 tem=w7;

46                         else if(c<=21)

47                                 tem=w8;

48                         else if(c<=25)

49                                 tem=w9; 

50                         for(int j=0;j<=i;j++)

51                         {

52                                 p--;

53                                 if(p<0)

54                                         p=n-1;

55                         }

56                         char ans;

57                         if(w[i]>='A'&&w[i]<='Z')

58                                 ans=tem[p]+'A';

59                         if(w[i]>='a'&&w[i]<='z')

60                                 ans=tem[p]+'a';

61                         cout<<ans;

62                 }

63                 cout<<endl;

64                 cin>>w;

65         }

66 }