模拟栈操作
2024-02-17 17:20:07
发布于：浙江
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#include<bits/stdc++.h>
using namespace std;
int main(){
stack<int>s;
int n;
cin>>n;
for(int i = 0;i<n;i++){
string a;
cin>>a;
if(a == "empty"){
if(s.empty()){
cout<<"yes"<<endl;
}
else{
cout<<"no"<<endl;
}
}
else if(a == "push"){
int n;
cin>>n;
s.push(n);
}
else if(a == "size"){
cout<<"size = "<<s.size()<<endl;
}
else if(a == "top"){
if(s.empty()){
cout<<"top fail"<<endl;
}
else{
cout<<"top = "<<s.top()<<endl;
}
}
else if(a == "pop"){
if(s.empty()){
cout<<"pop fail"<<endl;
}
else{
cout<<"pop "<<s.top()<<endl;
s.pop();
}
}
}
return 0;
}
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