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10866.cpp
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64 lines (58 loc) · 1.38 KB
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#include <iostream>
#include <deque>
#include <string>
using namespace std;
int main(){
cin.sync_with_stdio(0);
cin.tie(0);
deque<int> q;
string a;
int b;
int x;
cin >> x;
for(int i=0;i<x;i++){
cin >> a;
if(a=="push_back"){
cin >> b;
q.push_back(b);
}else if(a=="push_front"){
cin >> b;
q.push_front(b);
}else if(a=="front"){
if(q.empty()){
cout << -1 << '\n';
}else{
cout << q.front() << '\n';
}
}else if(a=="pop_front"){
if(!q.empty()){
cout << q.front() << '\n';
q.pop_front();
}else{
cout << -1 << '\n';
}
}else if(a=="pop_back"){
if(!q.empty()){
cout << q.back() << '\n';
q.pop_back();
}else{
cout << -1 << '\n';
}
}else if(a=="size"){
cout << q.size() << '\n';
}else if(a=="empty"){
if(q.empty()){
cout << 1 << '\n';
}else{
cout << 0 << '\n';
}
}else if(a=="back"){
if(!q.empty()){
cout << q.back() << '\n';
}else{
cout << -1 << '\n';
}
}
}
return 0;
}