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/**
* Author: Sohel Rana
* Date: 2022-05-25 21:07:34
* Task: G_-_Ada_and_Queue
**/
#include <bits/stdc++.h>
#define endl '\n'
#define sqr(x) (x) * (x)
#define gcd(x,y) __gcd(x, y)
#define lcm(x,y) ((x/gcd(x,y)) * y)
#define pf(x) push_front(x)
#define pb(x) push_back(x)
#define eb(x) emplace_back(x)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int)x.size()
#define prec(x) fixed<<setprecision(x)
#define debug(x) cerr<<#x<<" = "<<(x)<< endl
#define debug2(x,y) cerr<<#x<<" = "<<(x)<<","<<#y<<" = "<<(y)<< endl
#define unsyncIO ios_base::sync_with_stdio(false); cin.tie(nullptr)
using ll = long long;
using db = double;
using ld = long double;
using ull = unsigned long long;
const ld pi = acos((ld)-1);
const int mod = 1e9+7;
const ll inf = 1e18;
const ld eps = 1e-9;
const int mx = 1e5;
using namespace std;
int main()
{
//freopen("in.txt", "r", stdin);
//freopen("out.txt", "w", stdout);
unsyncIO;
deque<int> q;
int flag = 0;
int t;
cin >> t;
while (t--) {
string s;
int item;
cin >> s;
if (s == "toFront"){
cin >> item;
if (flag % 2 == 1) {
q.push_back(item);
} else
q.push_front(item);
} else if (s == "push_back") {
cin >> item;
if (flag % 2 == 1) {
q.push_front(item);
} else
q.push_back(item);
} else if (s == "front") {
if (q.empty()){
cout << "No job for Ada?" << endl;
} else {
if (flag % 2 == 1) {
cout << q.back() << endl;
q.pop_back();
} else {
cout << q.front()<<endl;
q.pop_front();
}
}
} else if (s == "back") {
if (q.empty()) {
cout << "No job for Ada?" << endl;
} else {
if (flag % 2 == 1) {
cout << q.front() << endl;
q.pop_front();
} else {
cout << q.back() << endl;
q.pop_back();
}
}
} else if (s == "reverse") {
flag++;
}
}
return 0;
} |