Submission #51851

#	Time	Username	Problem	Language	Result	Execution time	Memory
51851		mareksom	Editor (BOI15_edi)	C++17	35 / 100	3059 ms	34952 KiB

edi

#ifndef LOCAL
#pragma GCC optimize ("O3")
#endif

#include <bits/stdc++.h>

using namespace std;

#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename \
enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return {i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
  ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
  *this << "[";
  for (c it = d.b; it != d.e; ++it)
    *this << ", " + 2 * (it == d.b) << *it;
  ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define imie(x...) " [" #x ": " << (x) << "] "

using ld = long double;
using ll = long long;

constexpr int mod = 1000 * 1000 * 1000 + 7;
constexpr int odw2 = (mod + 1) / 2;

void OdejmijOd(int& a, int b) { a -= b; if (a < 0) a += mod; }
int Odejmij(int a, int b) { OdejmijOd(a, b); return a; }
void DodajDo(int& a, int b) { a += b; if (a >= mod) a -= mod; }
int Dodaj(int a, int b) { DodajDo(a, b); return a; }
int Mnoz(int a, int b) { return (ll) a * b % mod; }
void MnozDo(int& a, int b) { a = Mnoz(a, b); }
int Pot(int a, int b) { int res = 1; while (b) { if (b % 2 == 1) MnozDo(res, a); a = Mnoz(a, a); b /= 2; } return res; }
int Odw(int a) { return Pot(a, mod - 2); }
void PodzielDo(int& a, int b) { MnozDo(a, Odw(b)); }
int Podziel(int a, int b) { return Mnoz(a, Odw(b)); }
int Moduluj(ll x) { x %= mod; if (x < 0) x += mod; return x; }

template <typename T> T Maxi(T& a, T b) { return a = max(a, b); }
template <typename T> T Mini(T& a, T b) { return a = min(a, b); }

constexpr int nax = 300 * 1000 + 105;

set<int> on_level[nax];
int n2;
int drz[nax * 4];

void Init(int n) {
  n2 = 1;
  while (n2 <= n) n2 *= 2;
  for (int i = 1; i < n2 * 2; i++) {
    drz[i] = numeric_limits<int>::min();
  }
}

void Update(int w) {
  w += n2;
  if (on_level[w - n2].empty()) drz[w] = numeric_limits<int>::min();
  else drz[w] = *on_level[w - n2].rbegin();
  w /= 2;
  while (w) {
    drz[w] = max(drz[w * 2], drz[w * 2 + 1]);
    w /= 2;
  }
}

void Sksoruj(int lev, int pos) {
  auto it = on_level[lev].find(pos);
  if (it == on_level[lev].end()) {
    on_level[lev].insert(pos);
  } else {
    on_level[lev].erase(it);
  }
  Update(lev);
}

int Daj(int lev) {
  int a = n2;
  int b = n2 + lev - 1;
  int wyn = max(drz[a], drz[b]);
  while ((a / 2) != (b / 2)) {
    if (a % 2 == 0) Maxi(wyn, drz[a + 1]);
    if (b % 2 == 1) Maxi(wyn, drz[b - 1]);
    a /= 2;
    b /= 2;
  }
  return wyn;
}

//set<pair<int, int>> active;
//
//void Sksoruj(int lev, int pos) {
//  auto it2 = active.find(make_pair(lev, pos));
//  if (it2 == active.end()) {
//    active.insert(make_pair(lev, pos));
//  } else {
//    active.erase(it2);
//  }
//}
//
//int Daj(int lev) {
//  auto it = active.end();
//  for (auto it2 = active.begin(); it2 != active.end(); ++it2) {
//    if (it2->first < lev) {
//      if (it == active.end() or it->second < it2->second) {
//        it = it2;
//      }
//    }
//  }
//  assert(it != active.end());
//  return it->second;
//}

int level[nax];
int type[nax];
int ojc[nax];
int root[nax];

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  Init(n);
  for (int i = 1; i <= n; i++) {
    cin >> type[i];
    if (type[i] < 0) {
      level[i] = -type[i];
      ojc[i] = Daj(level[i]);
      root[i] = root[ojc[i]];

      debug() << imie(i) imie(ojc[i]) imie(root[i]);

      int j = i;
      while (true) {
        Sksoruj(level[j], j);
        if (j == ojc[j]) break;
        j = ojc[j];
      }
    } else {
      assert(type[i] > 0);
      level[i] = 0;
      root[i] = i;
      ojc[i] = i;
      Sksoruj(level[i], i);
      //active.insert(make_pair(level[i], i));
    }
    const int pos = Daj(1);
    if (pos == numeric_limits<int>::min()) {
      cout << 0 << '\n';
    } else {
      cout << type[pos] << '\n';
    }
//    debug() << imie(active);
//    auto it = active.lower_bound(make_pair(1, numeric_limits<int>::min()));
//    if (it == active.begin()) {
//      cout << 0 << '\n';
//    } else {
//      --it;
//      cout << type[it->second] << '\n';
//    }
  }
  return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 15 / 15
• Subtask 3: 0 / 28
• Subtask 4: 0 / 37