1078 字符串压缩与解压 (20分)

https://pintia.cn/problem-sets/994805260223102976/problems/994805262018265088

 1 #include <cstdio>
 2 #include <cstring>
 3 #include <string>
 4 #include <iostream>
 5 #include <algorithm>
 6 using namespace std;
 7 int main()
 8 {
 9     string a,b,num;
10     char chr;
11     cin>>chr;
12     getchar();
13     getline(cin,a);
14     int len=a.length();
15     int cnt=1;
16     if(chr=='D')
17     {
18         for(int i=0;i<len;i++)
19         {
20             if(a[i]>='0'&&a[i]<='9') num+=a[i];
21             else {
22                if(num.length()>0) cnt=stoi(num);
23                 while(cnt--) cout<<a[i];
24                 cnt=1;
25                 num="";
26             }
27         }
28     }else if(a.length()>0)
29     {
30         char pre=a[0];
31         for(int i=1;i<len;i++)
32         {
33             if(a[i]==pre) cnt++;
34             else {
35                 if(cnt>1) cout<<cnt;
36                 cout<<pre;
37                 cnt=1;
38                 pre=a[i];
39             }
40         }
41         if(cnt>1) cout<<cnt;
42         cout<<pre<<endl;
43     }
44     return 0;
45 }