URAL 1102. Strange Dialog

题目链接：http://acm.timus.ru/problem.aspx?space=1&num=1102

正着做9种情况：

input

inputon

inputone

out

output

outputon

outputone

one

反着做貌似更简单一些，情况更少一点。

我是正着做的。

 1 #include <cstdio>
 2 
 3 const int MAXN = 10000000 + 5;
 4 
 5 char str[MAXN];
 6 
 7 bool Judge()
 8 {
 9     if ( !(str[0] == 'o' || str[0] == 'p' || str[0] == 'i') ) return false;
10     int i = 0;
11     while ( str[i] != '\0' )
12     {
13         switch( str[i] )
14         {
15         case 'o':
16             if ( str[i+1] == 'u' && str[i+2] == 't' )
17             {
18                 if ( str[i+3] == 'p' && str[i+4] == 'u' && str[i+5] == 't' )
19                 {
20                     if ( str[i+6] == 'o' && str[i+7] == 'n' )
21                     {
22                         i += 8;
23                         if ( str[i] == 'e' ) ++i;
24 
25                     }
26                     else i += 6;
27                 }
28                 else i += 3;
29             }
30             else if ( str[i+1] == 'n' && str[i+2] == 'e' )
31                 i += 3;
32             else return false;
33             break;
34         case 'i':
35             if ( str[i+1] == 'n' )
36             {
37                 if ( str[i+2] == 'p' && str[i+3] == 'u' && str[i+4] == 't' )
38                 {
39                     if ( str[i+5] == 'o' && str[i+6] == 'n' )
40                     {
41                         i += 7;
42                         if ( str[i] == 'e' ) ++i;
43                     }
44                     else i += 5;
45                 }
46                 else i += 2;
47             }
48             else return false;
49             break;
50         case 'p':
51             if ( str[i+1] == 'u' && str[i+2] == 't' && str[i+3] == 'o' && str[i+4] == 'n' ) i += 5;
52             else return false;
53             break;
54         default :return false;
55         }
56     }
57     return true;
58 }
59 
60 int main()
61 {
62     int n;
63     scanf( "%d", &n );
64     while ( n-- )
65     {
66         scanf( "%s", str );
67         if ( Judge() ) puts("YES");
68         else puts("NO");
69     }
70     return 0;
71 }