天使的车站（栈）

 1 #include<cstdio>
 2 #include<iostream>
 3 #include<stack>
 4 using namespace std;
 5 int main()
 6 {
 7     int n,now=1,i,chu[30],cnt=1,size=0;
 8     char k;
 9     stack<int>station;
10     cin>>n;
11     while(n--)
12     {
13         cin>>k;
14         if(k==‘A‘)
15         {
16             chu[cnt++]=now++;
17         }
18         if(k==‘B‘)
19         {
20             if(size==5) 
21             {
22                 cout<<"No"<<endl;
23                 return 0;
24             }
25             size++;
26             station.push(now++);
27         }
28         if(k==‘C‘)
29         {
30             if(station.empty())
31             {
32                 cout<<"No"<<endl;
33                 return 0;
34             }
35             chu[cnt++]=station.top();
36             station.pop();
37             size--;
38         }
39     }
40     cout<<"Yes"<<endl;
41     for(i=1;i<=cnt-1;i++)
42     cout<<chu[i]<<endl;
43     return 0;
44  }