题解

#include<iostream>
#include<stack>
using namespace std;
stack<int> a;
int _min=0xffffff;
void get_min(){
    stack<int> x;x=a;
    _min=0xffffff;
    while(!x.empty()){
        _min=min(_min,x.top());
        x.pop();
    }
}
int main(){
    int n;
    cin>>n;
    string cmd,cmp1="push",cmp2="pop",cmp3="top",cmp4="get_min";
    int num;
    for(int i=1;i<=n;i++){
        cin>>cmd;
        if(cmd==cmp1){
            cin>>num;
            a.push(num);
            _min=min(_min,num);
        }
        if(cmd==cmp2){
            if(a.empty()) cout<<"error"<<endl;
            else a.pop();
            get_min();
        }
        if(cmd==cmp3){
            if(a.empty()) cout<<"error"<<endl;
            else cout<<a.top()<<endl;
        }
        if(cmd==cmp4){
            if(a.empty()) cout<<"error"<<endl;
            else cout<<_min<<endl;
        }
    }
}

by QFIT
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