Submission #859994

#	Time	Username	Problem	Language	Result	Execution time	Memory
859994		Tenis0206	The Potion of Great Power (CEOI20_potion)	C++11	56 / 100	2493 ms	262144 KiB

potion

#include <bits/stdc++.h>

using namespace std;

const int nmax = 1e5;
const int oo = 1e9;

int n;
int h[nmax + 5];

set<pair<int,int>> s;

vector<int> l;

mt19937 my_rand(time(NULL));

struct Node
{
    Node *st, *dr;
    int val, sz, prior;
};

struct tr
{
    Node nil;
    vector<pair<int,Node*>> r;
    Node *mod_fiu(Node *nod, int care, Node *f)
    {
        if(care==0)
        {
            nod -> st = f;
        }
        else
        {
            nod -> dr = f;
        }
        nod -> sz = nod->st->sz + 1 + nod->dr->sz;
        return nod;
    }
    pair<Node*,Node*> split(Node *nod, int k)
    {
        if(nod==&nil)
        {
            return {&nil,&nil};
        }
        if(nod -> st -> sz >= k)
        {
            if(nod->st != &nil)
            {
                nod->st = new Node{nod->st->st, nod->st->dr, nod->st->val, nod->st->sz, nod->st->prior};
            }
            auto t = split(nod -> st, k);
            return {t.first,mod_fiu(nod,0,t.second)};
        }
        else
        {
            if(nod->dr != &nil)
            {
                nod->dr = new Node{nod->dr->st, nod->dr->dr, nod->dr->val, nod->dr->sz, nod->dr->prior};
            }
            auto t = split(nod -> dr, k - nod -> st -> sz - 1);
            return {mod_fiu(nod,1,t.first),t.second};
        }
    }
    Node *join(Node *st, Node *dr)
    {
        if(st==&nil)
        {
            return dr;
        }
        if(dr==&nil)
        {
            return st;
        }
        if(st->prior>=dr->prior)
        {
            if(st->dr != &nil)
            {
                st->dr = new Node{st->dr->st, st->dr->dr, st->dr->val, st->dr->sz, st->dr->prior};
            }
            return mod_fiu(st,1,join(st->dr,dr));
        }
        else
        {
            if(dr->st != &nil)
            {
                dr->st = new Node{dr->st->st, dr->st->dr, dr->st->val, dr->st->sz, dr->st->prior};
            }
            return mod_fiu(dr,0,join(st,dr->st));
        }
    }
    int caut(Node *nod, int val)
    {
        if(nod==&nil)
        {
            return 0;
        }
        if(val>=nod->val)
        {
            return nod->st->sz + 1 + caut(nod->dr,val);
        }
        return caut(nod->st,val);
    }
    void parcurg(Node *nod)
    {
        if(nod == &nil)
        {
            return;
        }
        l.push_back(nod->val);
        parcurg(nod->st);
        parcurg(nod->dr);
    }
    void update_per(int poz, int val, int nr)
    {
        pair<int, Node*> cur = {nr, &nil};
        if(r.size() && r.back().second != &nil)
        {
            cur = {nr,new Node{r.back().second->st,r.back().second->dr,r.back().second->val,r.back().second->sz,r.back().second->prior}};
        }
        int p = caut(cur.second, poz);
        if(val==0)
        {
            auto t = split(cur.second, p - 1);
            auto t2 = split(t.second, 1);
            cur.second = join(t.first,t2.second);
        }
        else
        {
            auto t = split(cur.second, p);
            cur.second = join(join(t.first, new Node{&nil,&nil,poz,1,my_rand()}), t.second);
        }
        r.push_back(cur);
    }
    void find_friends(int v)
    {
        l.clear();
        int st = 0;
        int dr = r.size() - 1;
        int poz = -1;
        while(st<=dr)
        {
            int mij = (st + dr) >> 1;
            if(r[mij].first <= v)
            {
                poz = mij;
                st = mij + 1;
            }
            else
            {
                dr = mij - 1;
            }
        }
        if(poz==-1)
        {
            return;
        }
        parcurg(r[poz].second);
    }
};

tr t[nmax + 5];

void init(int N, int D, int H[])
{
    n = N;
    for(int i=0; i<n; i++)
    {
        h[i] = H[i];
    }
}

void curseChanges(int U, int A[], int B[])
{
    for(int i=0; i<U; i++)
    {
        int x = A[i];
        int y = B[i];
        if(x > y)
        {
            swap(x,y);
        }
        if(s.find({x,y})==s.end())
        {
            s.insert({x,y});
            t[x].update_per(y,+1,i + 1);
            pair<int,Node*> wtf = t[x].r.back();
            t[y].update_per(x,+1,i + 1);
        }
        else
        {
            auto it = s.find({x,y});
            s.erase(it);
            t[x].update_per(y,0,i + 1);
            t[y].update_per(x,0,i + 1);
        }
    }
    /*for(int i=1; i<=U; i++)
    {
        t[0].find_friends(i);
        for(auto it : l)
        {
            cerr<<it<<' ';
        }
        cerr<<'\n';
    }
    */
}

int question(int x, int y, int v)
{
    t[x].find_friends(v);
    vector<int> vx;
    for(auto it : l)
    {
        vx.push_back(h[it]);
    }
    t[y].find_friends(v);
    vector<int> vy;
    for(auto it : l)
    {
        vy.push_back(h[it]);
    }
    sort(vx.begin(),vx.end());
    sort(vy.begin(),vy.end());
    int rez = oo;
    int poz = 0;
    for(int i=0; i<vx.size(); i++)
    {
        while(poz < vy.size() && vy[poz] < vx[i])
        {
            ++poz;
        }
        if(poz >= vy.size())
        {
            break;
        }
        rez = min(rez, vy[poz] - vx[i]);
    }
    poz = 0;
    for(int i=0; i<vy.size(); i++)
    {
        while(poz < vx.size() && vx[poz] < vy[i])
        {
            ++poz;
        }
        if(poz >= vx.size())
        {
            break;
        }
        rez = min(rez, vx[poz] - vy[i]);
    }
    return rez;
}

Compilation message (stderr)

potion.cpp: In member function 'void tr::update_per(int, int, int)':
potion.cpp:131:77: warning: narrowing conversion of 'my_rand.std::mersenne_twister_engine<long unsigned int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15, 4022730752, 18, 1812433253>::operator()()' from 'std::mersenne_twister_engine<long unsigned int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15, 4022730752, 18, 1812433253>::result_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing]
  131 |             cur.second = join(join(t.first, new Node{&nil,&nil,poz,1,my_rand()}), t.second);
      |                                                                      ~~~~~~~^~
potion.cpp: In function 'void curseChanges(int, int*, int*)':
potion.cpp:187:29: warning: variable 'wtf' set but not used [-Wunused-but-set-variable]
  187 |             pair<int,Node*> wtf = t[x].r.back();
      |                             ^~~
potion.cpp: In function 'int question(int, int, int)':
potion.cpp:228:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  228 |     for(int i=0; i<vx.size(); i++)
      |                  ~^~~~~~~~~~
potion.cpp:230:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  230 |         while(poz < vy.size() && vy[poz] < vx[i])
      |               ~~~~^~~~~~~~~~~
potion.cpp:234:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  234 |         if(poz >= vy.size())
      |            ~~~~^~~~~~~~~~~~
potion.cpp:241:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  241 |     for(int i=0; i<vy.size(); i++)
      |                  ~^~~~~~~~~~
potion.cpp:243:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  243 |         while(poz < vx.size() && vx[poz] < vy[i])
      |               ~~~~^~~~~~~~~~~
potion.cpp:247:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  247 |         if(poz >= vx.size())
      |            ~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 0
• Subtask 2: 17 / 17
• Subtask 3: 0 / 14
• Subtask 4: 18 / 18
• Subtask 5: 21 / 21
• Subtask 6: 0 / 30