这里有题解，点进去

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ddin

https://www.bilibili.com/video/BV1UT42167xb/?spm_id_from=333.337.search-card.all.click&vd_source=d83726535bcc5ea0f01814a1f210c9bf

题解：

#include<bits/stdc++.h>
using namespace std;

int main(){
    char c;
    queue<string> name;
    while(cin>>c){
        if(c=='A'&&name.empty()){
            cout<<"-None"<<endl;
        }else if(c=='A'&&!name.empty()){
            cout<<"-"<<name.front()<<endl;
            name.pop();
        }
        if(c=='B'){
            string c;
            cin>>c;
            name.push(c);
        }
    }
    return 0;
}