結果

問題 No.1786 Maximum Suffix Median (Online)
ユーザー 👑 NachiaNachia
提出日時 2021-12-15 00:59:26
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 419 ms / 2,000 ms
コード長 5,429 bytes
コンパイル時間 1,052 ms
コンパイル使用メモリ 89,148 KB
実行使用メモリ 22,812 KB
最終ジャッジ日時 2024-07-23 19:44:36
合計ジャッジ時間 8,189 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge5
このコードへのチャレンジ
（要ログイン）

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
6,816 KB
testcase_01 AC 2 ms
6,944 KB
testcase_02 AC 2 ms
6,940 KB
testcase_03 AC 2 ms
6,940 KB
testcase_04 AC 2 ms
6,944 KB
testcase_05 AC 2 ms
6,944 KB
testcase_06 AC 2 ms
6,940 KB
testcase_07 AC 2 ms
6,940 KB
testcase_08 AC 322 ms
15,104 KB
testcase_09 AC 184 ms
11,392 KB
testcase_10 AC 239 ms
12,160 KB
testcase_11 AC 192 ms
10,624 KB
testcase_12 AC 329 ms
15,744 KB
testcase_13 AC 81 ms
14,976 KB
testcase_14 AC 61 ms
12,032 KB
testcase_15 AC 71 ms
13,312 KB
testcase_16 AC 72 ms
13,568 KB
testcase_17 AC 60 ms
11,904 KB
testcase_18 AC 419 ms
16,512 KB
testcase_19 AC 393 ms
16,512 KB
testcase_20 AC 390 ms
16,512 KB
testcase_21 AC 379 ms
16,640 KB
testcase_22 AC 398 ms
16,512 KB
testcase_23 AC 53 ms
19,500 KB
testcase_24 AC 38 ms
14,248 KB
testcase_25 AC 61 ms
21,604 KB
testcase_26 AC 191 ms
13,824 KB
testcase_27 AC 170 ms
12,928 KB
testcase_28 AC 203 ms
14,592 KB
testcase_29 AC 2 ms
6,944 KB
testcase_30 AC 2 ms
6,940 KB
testcase_31 AC 243 ms
16,512 KB
testcase_32 AC 58 ms
22,812 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(n); i++)



template<class Elem>
struct leftist_heap{
  struct Node{
    Node* l;
    Node* r;
    int height;
    Elem key;
  };

  Node* root;
  int m_size;

  leftist_heap(){
    root = nullptr;
    m_size = 0;
  }

  static Node* meld_node_norecursive(Node* root, Node* anotherroot){
    if(anotherroot == nullptr){
      return root;
    }
    if(root == nullptr){
      root = anotherroot;
      return root;
    }
    std::vector<Node*> st;
    st.reserve(root->height + anotherroot->height);
    Node** p1 = &root;
    Node** p2 = &anotherroot;
    while(true){
      if(*p1 == nullptr){
        *p1 = *p2;
        break;
      }
      if((*p1)->key < (*p2)->key) std::swap(*p1, *p2);
      st.push_back(*p1);
      p1 = &(*p1)->r;
    }
    auto st_ritr = st.rbegin();
    while(st_ritr != st.rend()){
      Node* c = *st_ritr;
      if(c->l == nullptr){
        std::swap(c->l, c->r);
        c->height = 1;
      }
      else if(c->r == nullptr){
        c->height = 1;
      }
      else{
        if(c->l->height < c->r->height){
          std::swap(c->l, c->r);
        }
        c->height = c->r->height + 1;
      }
      st_ritr++;
    }
    return root;
  }

  void push(const Elem& val){
    Node* new_node = new Node();
    new_node->height = 1;
    new_node->l = nullptr;
    new_node->r = nullptr;
    new_node->key = val;
    root = meld_node_norecursive(root, new_node);
    m_size += 1;
  }

  Elem top(){
    return root->key;
  }

  void pop(){
    auto old_root = root;
    root = meld_node_norecursive(old_root->l, old_root->r);
    delete(old_root);
    m_size -= 1;
  }

  int size(){
    return m_size;
  }
};


struct less_int{
    int a;
    bool operator<(less_int& r) const { return a < r.a; }
};
struct greater_int{
    int a;
    bool operator<(greater_int& r) const { return a > r.a; }
};


/*
struct Block{
    priority_queue<int, vector<int>, less<int>> L;
    priority_queue<int, vector<int>, greater<int>> R;
    void output(){
        auto Lbuf = L;
        cout << "L : [ "; while(Lbuf.size()){ cout << Lbuf.top() << " "; Lbuf.pop(); } cout << "] ";
        auto Rbuf = R;
        cout << "R : [ "; while(Rbuf.size()){ cout << Rbuf.top() << " "; Rbuf.pop(); } cout << "] ";
        cout << endl;
    }
    int mid(int newitem) const {
        if(L.top() > newitem) return L.top();
        return newitem;
    }
    static Block make(int l, int r){
        Block res;
        res.L.push(l);
        res.R.push(r);
        return res;
    }
};

Block merge_blocks(Block l, Block r){
    if(l.L.size() < r.L.size()) swap(l,r);
    while(r.L.size()){
        l.L.push(r.L.top()); r.L.pop();
        l.R.push(r.R.top()); r.R.pop();
    }
    int swap_count = 0;
    while(l.L.top() > l.R.top()){
        int lL = l.L.top(); l.L.pop();
        int lR = l.R.top(); l.R.pop();
        l.L.push(lR);
        l.R.push(lL);
        swap_count++;
    }
    cout << " -> " << l.L.top() << ", " << l.R.top() << endl;
    return move(l);
}

bool have_better_merge(Block& l, Block& r){
    return !(l.R.top() < r.L.top());
}
*/


struct Block{
    leftist_heap<less_int> L;
    leftist_heap<greater_int> R;
    int mid(int newitem) {
        if(L.top().a > newitem) return L.top().a;
        return newitem;
    }
    static Block make(int l, int r){
        Block res;
        res.L.push(less_int{l});
        res.R.push(greater_int{r});
        return res;
    }
};

Block merge_blocks(Block l, Block r){
    if(l.L.size() < r.L.size()) swap(l,r);
    while(r.L.size()){
        l.L.push(r.L.top()); r.L.pop();
        l.R.push(r.R.top()); r.R.pop();
    }
    int swap_count = 0;
    while(l.L.top().a > l.R.top().a){
        int lL = l.L.top().a; l.L.pop();
        int lR = l.R.top().a; l.R.pop();
        l.L.push(less_int{lR});
        l.R.push(greater_int{lL});
        swap_count++;
    }
    return move(l);
}

bool have_better_merge(Block& l, Block& r){
    return !(l.R.top().a < r.L.top().a);
}



int main() {
    int N; cin >> N;
    vector<int> A(N);
    int preans = 0;

    vector<Block> blocks[2];
    rep(t,2){
        blocks[t].push_back(Block::make(-2,-2));
    }

    rep(i,N){
        int a; cin >> a; a ^= preans;
        A[i] = a;
        // cout << "a = " << A[i] << endl;
        int t = i%2;
        //auto& pblock = blocks[1-t].back();
        preans = blocks[1-t].back().mid(a);
        //if(pblock.L.top() > a) preans = pblock.L.top();
        //else preans = a;
        if(i == 0){
            blocks[t].push_back(Block::make(-1,a));
        }
        else{
            Block tmp = Block::make(min(A[i-1], A[i]), max(A[i-1], A[i]));
            while(true){
                if(!have_better_merge(blocks[t].back(), tmp)) break;
                tmp = merge_blocks(blocks[t].back(), tmp);
                blocks[t].pop_back();
            }
            blocks[t].push_back(move(tmp));
        }
        cout << preans << "\n";
        //cout << "process : " << endl; cout << endl;
        //rep(t,2){ for(auto& a : blocks[t]) a.output(); cout << endl; }
        //cout << endl << endl;
    }
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;
0