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