DNA合成--全国模拟（一）

 1 #include <iostream>
 2 using namespace std;
 3 int main()
 4 {
 5     string a;
 6     string b;
 7     while(cin>>a>>b)
 8     {
 9         int count = 0;
10         int length_a = a.size();
11         int length_b = b.size();
12         for(int i = 0;i<length_a;i++)
13         {
14             switch(a[i])
15             {
16             case ‘A‘:
17                 if(b[i] == ‘T‘)
18                     break;
19                 else
20                 {
21                     count++;
22                     break;
23                 }
24             case ‘C‘:
25                 if(b[i] == ‘G‘)
26                     break;
27                 else
28                 {
29                     count++;
30                     break;
31                 }
32             case ‘G‘:
33                 if(b[i] == ‘C‘)
34                     break;
35                 else
36                 {
37                     count++;
38                     break;
39                 }
40             case ‘T‘:
41                 if(b[i] == ‘A‘)
42                     break;
43                 else
44                 {
45                     count++;
46                     break;
47                 }
48             }
49         }
50         cout<<count<<endl;
51     }
52     return 0;
53 }