C/C++

 1 #include <iostream>
 2 #include <string>
 3 #include <stdlib.h>
 4 #include <cmath>
 5 
 6 using namespace  std;
 7 
 8 int main() {
 9     char s, last, c;
10     int num = 0;
11     string sum = "0";                               //一定要初始化，否则测试点2会有运行时错误
12     c = getchar();
13     last = getchar();                               //用于接收第一行输入结尾的空格
14     last = NULL;
15     if(c == 'C') {
16         while (last != '
') {                      //回车换行时结束
17             s = getchar();
18             if (s != last && last != NULL) {        //字母变换时则输出（排除last还没值时的输入）
19                 if (num == 1) cout << last;
20                 else cout << num << last;
21                 num = 0;
22             }
23             num++;
24             last = s;
25         }
26     } else if (c == 'D') {
27         while (last != '
') {
28             s = getchar();
29             if (!(s >= '0' && s <= '9')) {          //若输入不为数字，此时输出字符
30                 for (int i = 0; i < stoi(sum); ++i) {
31                     cout << s;
32                 }
33                 if (sum == "0") cout << s;          //处理只有一个字符的情况
34                 sum = "0";
35                 num = 0;
36             } else if (s >= '0' && s <= '9') {      //用字符串相加来处理输出字母个数大于10的情况
37                 sum += s;
38                 num++;
39             }
40             last = s;
41         }
42     }
43     return 0;
44 }

默默地一点点变强，细节决定成败