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#include <bits/stdc++.h>
#define ll long long
#define INF 1000000005
#define MOD 1000000007
#define EPS 1e-10
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;--i)
#define srep(i,s,t) for(int i=(int)(s);i<(int)(t);++i)
#define each(a,b) for(const auto& (a): (b))
#define all(v) (v).begin(),(v).end()
#define len(v) (int)(v).size()
#define zip(v) sort(all(v)),v.erase(unique(all(v)),v.end())
#define cmx(x,y) x=max(x,y)
#define cmn(x,y) x=min(x,y)
#define fi first
#define se second
#define pb push_back
#define show(x) cout<<#x<<" = "<<(x)<<endl
#define sar(a,n) {cout<<#a<<":";rep(pachico,n)cout<<" "<<a[pachico];cout<<endl;}
 
using namespace std;
 
template<typename S,typename T>auto&operator<<(ostream&o,pair<S,T>p){return o<<"{"<<p.fi<<","<<p.se<<"}";}
template<typename T>auto&operator<<(ostream&o,set<T>s){for(auto&e:s)o<<e<<" ";return o;}
template<typename S,typename T,typename U>
auto&operator<<(ostream&o,priority_queue<S,T,U>q){while(!q.empty())o<<q.top()<<" ",q.pop();return o;}
template<typename K,typename T>auto&operator<<(ostream&o,map<K,T>&m){for(auto&e:m)o<<e<<" ";return o;}
template<typename T>auto&operator<<(ostream&o,vector<T>v){for(auto&e:v)o<<e<<" ";return o;}
void ashow(){cout<<endl;}template<typename T,typename...A>void ashow(T t,A...a){cout<<t<<" ";ashow(a...);}
template<typename S,typename T,typename U>
struct TRI{S fi;T se;U th;TRI(){}TRI(S f,T s,U t):fi(f),se(s),th(t){}
bool operator<(const TRI&_)const{return(fi==_.fi)?((se==_.se)?(th<_.th):(se<_.se)):(fi<_.fi);}};
template<typename S,typename T,typename U>
auto&operator<<(ostream&o,TRI<S,T,U>&t){return o<<"{"<<t.fi<<","<<t.se<<","<<t.th<<"}";}
 
typedef pair<int, int> P;
typedef pair<ll,ll> pll;
typedef TRI<int, int, int> tri;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<double> vd;
typedef vector<P> vp;
typedef vector<string> vs;
 
const int MAX_N = 100005;
 
template<typename _Tp> class node {
public:
    const int key;
    int sum, pmin;
    _Tp data;
    node *left, *right, *par;
    node(const int _key, _Tp&& _data) noexcept
         : key(_key), sum((_data == INF) ? -1 : 1), pmin(min(sum, 0)), data(move(_data)),
		 	 left(nullptr), right(nullptr), par(nullptr){}
    inline bool isRoot() const { return !par; }
    void eval(){
        sum = pmin = 0;
        if(left) sum += left->sum, pmin = min(pmin, left->pmin);
        sum += ((data == INF) ? -1 : 1), pmin = min(pmin, sum);
        if(right){
            pmin = min(pmin, sum + right->pmin), sum += right->sum;
        }
    }
    void rotate(bool right_){
        node<_Tp> *p = par, *g = p->par;
        if(right_){
            if((p->left = right)) right->par = p;
            right = p, p->par = this;
        }else{
            if((p->right = left)) left->par = p;
            left = p, p->par = this;
        }
        p->eval(), eval();
        if(!(par = g)) return;
        if(g->left == p) g->left = this;
        if(g->right == p) g->right = this;
        g->eval();
    }
};
 
template<typename _Tp>
node<_Tp>* splay(node<_Tp>* u) noexcept {
    if(!u) return nullptr;
    while(!(u->isRoot())){
        node<_Tp> *p = u->par, *gp = p->par;
        if(p->isRoot()){
            u->rotate((u == p->left));
        }else{
            bool flag = (u == p->left);
            if((u == p->left) == (p == gp->left)){
                p->rotate(flag), u->rotate(flag);
            }else{
                u->rotate(flag), u->rotate(!flag);
            }
        }
    }
    return u;
}
 
template<typename _Tp>
pair<node<_Tp>*, bool> get(const int _key, node<_Tp>* root){
    node<_Tp> *cur = nullptr, *nx = root, *res = nullptr;
    while(nx){
        cur = nx;
        if(cur->key <= _key) nx = cur->right, res = cur;
        else nx = cur->left;
    }
    node<_Tp>* tmp = splay(cur);
    return res ? make_pair(splay(res), true) : make_pair(tmp, false);
}
 
template<typename _Tp>
node<_Tp>* join(node<_Tp>* root1, node<_Tp>* root2) noexcept {
    if(!root1 || !root2) return root1 ? root1 : root2;
    node<_Tp> *cur = nullptr, *nx = root1;
    while(nx) cur = nx, nx = cur->right;
    node<_Tp>* ver = splay(cur);
    ver->right = root2, ver->eval(), root2->par = ver;
    return ver;
}
 
template<typename _Tp>
node<_Tp>* insert(node<_Tp>* ver, node<_Tp>* root) noexcept {
    if(!root) return ver;
    node<_Tp> *cur = nullptr, *nx = root;
    while(nx){
        cur = nx;
        if(cur->key > ver->key) nx = cur->left;
        else nx = cur->right;
    }
    if(cur->key > ver->key) cur->left = ver, ver->par = cur;
    else cur->right = ver, ver->par = cur;
    cur->eval();
    return splay(ver);
}
 
template<typename _Tp>
node<_Tp> *erase(node<_Tp> *ver){
    ver = splay(ver);
    node<_Tp> *l = ver->left, *r = ver->right;
    if(l) l->par = nullptr;
    if(r) r->par = nullptr;
    delete ver;
    return join(l, r);
}
 
template<typename _Tp> class RetroactiveDeque {
public:
    node<_Tp> *lroot, *rroot;
private:
    int left_pos(const int _time){
        pair<node<_Tp>*, bool> lres = get(_time, lroot);
        lroot = lres.first;
        int l = 0;
        if(lres.second) l = (lroot->left ? lroot->left->sum : 0) + ((lroot->data == INF) ? -1 : 1);
        return l;
    }
    int right_pos(const int _time){
        pair<node<_Tp>*, bool> rres = get(_time, rroot);
        rroot = rres.first;
        int r = 0;
        if(rres.second) r = (rroot->left ? rroot->left->sum : 0) + ((rroot->data == INF) ? -1 : 1);
        return r;
    }
    template<typename Data>
    node<_Tp> *push_front_impl(Data&& data, const int _time){
        _Tp new_data = forward<Data>(data);
        node<_Tp> *new_node = new node<_Tp>(_time, move(new_data));
        lroot = insert(new_node, lroot);
        return new_node;
    }
    node<_Tp> *pop_front_impl(const int _time){
        node<_Tp> *new_node = new node<_Tp>(_time, INF);
        lroot = insert(new_node, lroot);
        return new_node;
    }
    template<typename Data>
    node<_Tp> *push_back_impl(Data&& data, const int _time){
        _Tp new_data = forward<Data>(data);
        node<_Tp> *new_node = new node<_Tp>(_time, move(new_data));
        rroot = insert(new_node, rroot);
        return new_node;
    }
    node<_Tp> *pop_back_impl(const int _time){
        node<_Tp> *new_node = new node<_Tp>(_time, INF);
        rroot = insert(new_node, rroot);
        return new_node;
    }
    pair<node<_Tp>*, bool> find(int index, node<_Tp>* root){
        if(!root) return make_pair(nullptr, false);
        node<_Tp> *cur = root, *nx = root->left, *res = nullptr;
        if(!nx && index == 0) return make_pair(root, true);
        else if(!nx || index < nx->pmin) return make_pair(root, false);
        while(nx){
            cur = nx;
            int cur_sum = (cur->left ? cur->left->sum : 0) + ((cur->data == INF) ? -1 : 1);
            if(cur->right){
                if(cur_sum + cur->right->pmin <= index){
                    nx = cur->right, index -= cur_sum;
                    continue;
                }
            }
            if(cur_sum == index){
                res = cur;
                break;
            }else nx = cur->left;
        }
        node<_Tp> *tmp = splay(cur);
        if(!res) return make_pair(tmp, true);
        cur = splay(res), nx = cur->right;
        assert(nx);
        while(nx) cur = nx, nx = cur->left;
        return make_pair(splay(cur), true);
    }
    _Tp query_impl(int index, const int _time, bool back){
        const int lpos = left_pos(_time), rpos = right_pos(_time);
        // ashow(lpos, rpos);
        if(lpos + rpos == 0) return -1;
        if(back) index = lpos + rpos - 1;
        const int lid = lpos - index, rid = index + 1 - lpos;
        pair<node<_Tp>*, bool> lres = find(lid - 1, lroot);
        pair<node<_Tp>*, bool> rres = find(rid - 1, rroot);
        lroot = lres.first, rroot = rres.first;
        if(lres.second){
            if(rres.second){
                return (lroot->key < rroot->key) ? rroot->data : lroot->data;
            }else{
                return lroot->data;
            }
        }else{
            assert(rres.second);
            return rroot->data;
        }
    }
public:
    RetroactiveDeque() : lroot(nullptr), rroot(nullptr){}
    size_t size(const int _time){ return left_pos(_time) + right_pos(_time); }
    _Tp front(const int _time){ return query_impl(0, _time, false); }
    _Tp back(const int _time){ return query_impl(0, _time, true); }
    node<_Tp> *push_front(const _Tp& value, const int _time){ return push_front_impl(value, _time); }
    node<_Tp> *push_front(_Tp&& value, const int _time){ return push_front_impl(move(value), _time); }
    node<_Tp> *pop_front(const int _time){ return pop_front_impl(_time); }
    node<_Tp> *push_back(const _Tp& value, const int _time){ return push_back_impl(value, _time); }
    node<_Tp> *push_back(_Tp&& value, const int _time){ return push_back_impl(move(value), _time); }
    node<_Tp> *pop_back(const int _time){ return pop_back_impl(_time); }
    _Tp query(const size_t index, const int _time){ return query_impl(index, _time, false); }
};
 
char c[12];
 
int main()
{
    int n, t, x;
	scanf("%d", &n);
    string s;
    unordered_map<int, pair<node<int>*, bool> > ump;
    RetroactiveDeque<int> rd;
    rep(i,n){
		scanf("%d %s", &t, c);
        if(c[0] == '-'){
			pair<node<int>*, bool> res = ump[t];
			if(res.second) rd.lroot = erase(res.first);
			else rd.rroot = erase(res.first);
		}else if(c[0] == '?'){
			printf("%d %d\n", rd.front(t), rd.back(t));
			fflush(stdout);
			continue;
        }else if(c[1] == 'o' && c[4] == 'b'){
            ump[t] = make_pair(rd.pop_back(t), false);
        }else if(c[1] == 'o' && c[4] == 'f'){
            ump[t] = make_pair(rd.pop_front(t), true);
		}else if(c[1] == 'u' && c[5] == 'b'){
			scanf("%d", &x);
            ump[t] = make_pair(rd.push_back(x, t), false);
        }else{
			scanf("%d", &x);
            ump[t] = make_pair(rd.push_front(x, t), true);
        }
		printf("0 0\n");
		fflush(stdout);
    }
    return 0;
}

#include <bits/stdc++.h>
#define ll long long
#define INF 1000000005
#define MOD 1000000007
#define EPS 1e-10
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;--i)
#define srep(i,s,t) for(int i=(int)(s);i<(int)(t);++i)
#define each(a,b) for(const auto& (a): (b))
#define all(v) (v).begin(),(v).end()
#define len(v) (int)(v).size()
#define zip(v) sort(all(v)),v.erase(unique(all(v)),v.end())
#define cmx(x,y) x=max(x,y)
#define cmn(x,y) x=min(x,y)
#define fi first
#define se second
#define pb push_back
#define show(x) cout<<#x<<" = "<<(x)<<endl
#define sar(a,n) {cout<<#a<<":";rep(pachico,n)cout<<" "<<a[pachico];cout<<endl;}
 
using namespace std;
 
template<typename S,typename T>auto&operator<<(ostream&o,pair<S,T>p){return o<<"{"<<p.fi<<","<<p.se<<"}";}
template<typename T>auto&operator<<(ostream&o,set<T>s){for(auto&e:s)o<<e<<" ";return o;}
template<typename S,typename T,typename U>
auto&operator<<(ostream&o,priority_queue<S,T,U>q){while(!q.empty())o<<q.top()<<" ",q.pop();return o;}
template<typename K,typename T>auto&operator<<(ostream&o,map<K,T>&m){for(auto&e:m)o<<e<<" ";return o;}
template<typename T>auto&operator<<(ostream&o,vector<T>v){for(auto&e:v)o<<e<<" ";return o;}
void ashow(){cout<<endl;}template<typename T,typename...A>void ashow(T t,A...a){cout<<t<<" ";ashow(a...);}
template<typename S,typename T,typename U>
struct TRI{S fi;T se;U th;TRI(){}TRI(S f,T s,U t):fi(f),se(s),th(t){}
bool operator<(const TRI&_)const{return(fi==_.fi)?((se==_.se)?(th<_.th):(se<_.se)):(fi<_.fi);}};
template<typename S,typename T,typename U>
auto&operator<<(ostream&o,TRI<S,T,U>&t){return o<<"{"<<t.fi<<","<<t.se<<","<<t.th<<"}";}
 
typedef pair<int, int> P;
typedef pair<ll,ll> pll;
typedef TRI<int, int, int> tri;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<double> vd;
typedef vector<P> vp;
typedef vector<string> vs;
 
const int MAX_N = 100005;
 
template<typename _Tp> class node {
public:
    const int key;
    int sum, pmin;
    _Tp data;
    node *left, *right, *par;
    node(const int _key, _Tp&& _data) noexcept
         : key(_key), sum((_data == INF) ? -1 : 1), pmin(min(sum, 0)), data(move(_data)),
		 	 left(nullptr), right(nullptr), par(nullptr){}
    inline bool isRoot() const { return !par; }
    void eval(){
        sum = pmin = 0;
        if(left) sum += left->sum, pmin = min(pmin, left->pmin);
        sum += ((data == INF) ? -1 : 1), pmin = min(pmin, sum);
        if(right){
            pmin = min(pmin, sum + right->pmin), sum += right->sum;
        }
    }
    void rotate(bool right_){
        node<_Tp> *p = par, *g = p->par;
        if(right_){
            if((p->left = right)) right->par = p;
            right = p, p->par = this;
        }else{
            if((p->right = left)) left->par = p;
            left = p, p->par = this;
        }
        p->eval(), eval();
        if(!(par = g)) return;
        if(g->left == p) g->left = this;
        if(g->right == p) g->right = this;
        g->eval();
    }
};
 
template<typename _Tp>
node<_Tp>* splay(node<_Tp>* u) noexcept {
    if(!u) return nullptr;
    while(!(u->isRoot())){
        node<_Tp> *p = u->par, *gp = p->par;
        if(p->isRoot()){
            u->rotate((u == p->left));
        }else{
            bool flag = (u == p->left);
            if((u == p->left) == (p == gp->left)){
                p->rotate(flag), u->rotate(flag);
            }else{
                u->rotate(flag), u->rotate(!flag);
            }
        }
    }
    return u;
}
 
template<typename _Tp>
pair<node<_Tp>*, bool> get(const int _key, node<_Tp>* root){
    node<_Tp> *cur = nullptr, *nx = root, *res = nullptr;
    while(nx){
        cur = nx;
        if(cur->key <= _key) nx = cur->right, res = cur;
        else nx = cur->left;
    }
    node<_Tp>* tmp = splay(cur);
    return res ? make_pair(splay(res), true) : make_pair(tmp, false);
}
 
template<typename _Tp>
node<_Tp>* join(node<_Tp>* root1, node<_Tp>* root2) noexcept {
    if(!root1 || !root2) return root1 ? root1 : root2;
    node<_Tp> *cur = nullptr, *nx = root1;
    while(nx) cur = nx, nx = cur->right;
    node<_Tp>* ver = splay(cur);
    ver->right = root2, ver->eval(), root2->par = ver;
    return ver;
}
 
template<typename _Tp>
node<_Tp>* insert(node<_Tp>* ver, node<_Tp>* root) noexcept {
    if(!root) return ver;
    node<_Tp> *cur = nullptr, *nx = root;
    while(nx){
        cur = nx;
        if(cur->key > ver->key) nx = cur->left;
        else nx = cur->right;
    }
    if(cur->key > ver->key) cur->left = ver, ver->par = cur;
    else cur->right = ver, ver->par = cur;
    cur->eval();
    return splay(ver);
}
 
template<typename _Tp>
node<_Tp> *erase(node<_Tp> *ver){
    ver = splay(ver);
    node<_Tp> *l = ver->left, *r = ver->right;
    if(l) l->par = nullptr;
    if(r) r->par = nullptr;
    delete ver;
    return join(l, r);
}
 
template<typename _Tp> class RetroactiveDeque {
public:
    node<_Tp> *lroot, *rroot;
private:
    int left_pos(const int _time){
        pair<node<_Tp>*, bool> lres = get(_time, lroot);
        lroot = lres.first;
        int l = 0;
        if(lres.second) l = (lroot->left ? lroot->left->sum : 0) + ((lroot->data == INF) ? -1 : 1);
        return l;
    }
    int right_pos(const int _time){
        pair<node<_Tp>*, bool> rres = get(_time, rroot);
        rroot = rres.first;
        int r = 0;
        if(rres.second) r = (rroot->left ? rroot->left->sum : 0) + ((rroot->data == INF) ? -1 : 1);
        return r;
    }
    template<typename Data>
    node<_Tp> *push_front_impl(Data&& data, const int _time){
        _Tp new_data = forward<Data>(data);
        node<_Tp> *new_node = new node<_Tp>(_time, move(new_data));
        lroot = insert(new_node, lroot);
        return new_node;
    }
    node<_Tp> *pop_front_impl(const int _time){
        node<_Tp> *new_node = new node<_Tp>(_time, INF);
        lroot = insert(new_node, lroot);
        return new_node;
    }
    template<typename Data>
    node<_Tp> *push_back_impl(Data&& data, const int _time){
        _Tp new_data = forward<Data>(data);
        node<_Tp> *new_node = new node<_Tp>(_time, move(new_data));
        rroot = insert(new_node, rroot);
        return new_node;
    }
    node<_Tp> *pop_back_impl(const int _time){
        node<_Tp> *new_node = new node<_Tp>(_time, INF);
        rroot = insert(new_node, rroot);
        return new_node;
    }
    pair<node<_Tp>*, bool> find(int index, node<_Tp>* root){
        if(!root) return make_pair(nullptr, false);
        node<_Tp> *cur = root, *nx = root->left, *res = nullptr;
        if(!nx && index == 0) return make_pair(root, true);
        else if(!nx || index < nx->pmin) return make_pair(root, false);
        while(nx){
            cur = nx;
            int cur_sum = (cur->left ? cur->left->sum : 0) + ((cur->data == INF) ? -1 : 1);
            if(cur->right){
                if(cur_sum + cur->right->pmin <= index){
                    nx = cur->right, index -= cur_sum;
                    continue;
                }
            }
            if(cur_sum == index){
                res = cur;
                break;
            }else nx = cur->left;
        }
        node<_Tp> *tmp = splay(cur);
        if(!res) return make_pair(tmp, true);
        cur = splay(res), nx = cur->right;
        assert(nx);
        while(nx) cur = nx, nx = cur->left;
        return make_pair(splay(cur), true);
    }
    _Tp query_impl(int index, const int _time, bool back){
        const int lpos = left_pos(_time), rpos = right_pos(_time);
        // ashow(lpos, rpos);
        if(lpos + rpos == 0) return -1;
        if(back) index = lpos + rpos - 1;
        const int lid = lpos - index, rid = index + 1 - lpos;
        pair<node<_Tp>*, bool> lres = find(lid - 1, lroot);
        pair<node<_Tp>*, bool> rres = find(rid - 1, rroot);
        lroot = lres.first, rroot = rres.first;
        if(lres.second){
            if(rres.second){
                return (lroot->key < rroot->key) ? rroot->data : lroot->data;
            }else{
                return lroot->data;
            }
        }else{
            assert(rres.second);
            return rroot->data;
        }
    }
public:
    RetroactiveDeque() : lroot(nullptr), rroot(nullptr){}
    size_t size(const int _time){ return left_pos(_time) + right_pos(_time); }
    _Tp front(const int _time){ return query_impl(0, _time, false); }
    _Tp back(const int _time){ return query_impl(0, _time, true); }
    node<_Tp> *push_front(const _Tp& value, const int _time){ return push_front_impl(value, _time); }
    node<_Tp> *push_front(_Tp&& value, const int _time){ return push_front_impl(move(value), _time); }
    node<_Tp> *pop_front(const int _time){ return pop_front_impl(_time); }
    node<_Tp> *push_back(const _Tp& value, const int _time){ return push_back_impl(value, _time); }
    node<_Tp> *push_back(_Tp&& value, const int _time){ return push_back_impl(move(value), _time); }
    node<_Tp> *pop_back(const int _time){ return pop_back_impl(_time); }
    _Tp query(const size_t index, const int _time){ return query_impl(index, _time, false); }
};
 
char c[12];

int main()
{
    int n, t, x;
	scanf("%d", &n);
    string s;
    unordered_map<int, pair<node<int>*, bool> > ump;
    RetroactiveDeque<int> rd;
    rep(i,n){
		scanf("%d %s", &t, c);
        if(c[0] == '-'){
			pair<node<int>*, bool> res = ump[t];
			if(res.second) rd.lroot = erase(res.first);
			else rd.rroot = erase(res.first);
		}else if(c[0] == '?'){
			printf("%d %d\n", rd.front(t), rd.back(t));
			fflush(stdout);
			continue;
        }else if(c[1] == 'o' && c[4] == 'b'){
            ump[t] = make_pair(rd.pop_back(t), false);
        }else if(c[1] == 'o' && c[4] == 'f'){
            ump[t] = make_pair(rd.pop_front(t), true);
		}else if(c[1] == 'u' && c[5] == 'b'){
			scanf("%d", &x);
            ump[t] = make_pair(rd.push_back(x, t), false);
        }else{
			scanf("%d", &x);
            ump[t] = make_pair(rd.push_front(x, t), true);
        }
		printf("0 0\n");
		fflush(stdout);
    }
    return 0;
}


Success #stdin #stdout 0.02s 4952KB

stdin

Standard input is empty

stdout

https://ideone.com/SfocpO

language:

C++14 (gcc 8.3)

created:

visibility:

public

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