```cpp
int e=0;
for(i=0;i<len;i++)
{
if(s[i]=='x')
{
int x;
x=int(s[i+1]-'0');
s[i]=char(a[x]+'0');
s[i+1]=' ';
}
}
```
此处$x$后的编号不止$1$位，例如：`x10`
by BorisDimitri @ 2021-08-18 22:43:46
@[BorisDimitri](/user/298208) 蟹蟹大佬
by queen_street @ 2021-08-19 09:16:55