Submission #250535

#	Time	Username	Problem	Language	Result	Execution time	Memory
250535		fedoseevtimofey	Werewolf (IOI18_werewolf)	C++14	15 / 100	1030 ms	119456 KiB

werewolf

#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <cstring>
#include <cmath>
#include <cstdlib>
#include <algorithm>
#include <random>
#include <iomanip>
#include <functional>
#include <cassert>

using namespace std;

typedef long long ll;

#include "werewolf.h"

struct Dsu {
  vector <int> p, cp;
  int n;
  int get(int u) {
    return (u == cp[u] ? u : cp[u] = get(cp[u]));
  } 
  void join(int u, int v) {
    u = get(u);
    v = get(v);
    if (u != v) {
      int x = n++;
      p.push_back(x);
      cp.push_back(x);
      p[u] = p[v] = cp[u] = cp[v] = x;
    }
  } 
  Dsu(int nn) {
    n = nn;
    p.resize(n), cp.resize(n);
    for (int i = 0; i < n; ++i) {
      p[i] = i;
      cp[i] = i;
    }
  }
};

struct Fenwick {
  vector <int> f;
  int n;
  Fenwick(int nn) {
    n = nn;
    f.resize(n);
  }
  void modify(int i, int x) {
    for (; i < n; i |= i + 1) {
      f[i] += x;
    }
  }
  int get(int r) {
    int res = 0;
    for (; r >= 0; r &= r + 1, --r) {
      res += f[r];
    }
    return res;
  }
  int sum(int l, int r) {
    return get(r) - get(l - 1);
  }
};

struct Event {
  int x, l, r, tp, id;
  Event(int x, int l, int r, int tp, int id) : x(x), l(l), r(r), tp(tp), id(id) {}
  bool operator <(const Event &other) const {
    if (x != other.x) return x < other.x;
    return id < other.id;
  }
};    
 

std::vector<int> check_validity(int n, std::vector<int> x, std::vector<int> y, std::vector<int> s, std::vector<int> e, std::vector<int> l, std::vector<int> r) {
  vector <vector <int>> g(n);
  for (int i = 0; i < (int)x.size(); ++i) {
    g[x[i]].push_back(y[i]);
    g[y[i]].push_back(x[i]);
  }
  int q = s.size();
  vector <vector <int>> who_l(n), who_r(n);
  for (int i = 0; i < n; ++i) {
    who_l[l[i]].push_back(i);
    who_r[r[i]].push_back(i);
  }
  vector <int> where_st(q), where_en(q);
  Dsu st(n), en(n); 
  for (int i = n - 1; i >= 0; --i) {
    for (auto v : g[i]) {
      if (v >= i) {
        st.join(i, v);
      }
    }
    for (auto id : who_l[i]) {
      where_st[id] = st.get(s[id]);
    }
  }
  for (int i = 0; i < n; ++i) {
    for (auto v : g[i]) {
      if (v <= i) {
        en.join(i, v);
      }
    }
    for (auto id : who_r[i]) {
      where_en[id] = en.get(e[id]);
    }
  }
  vector <vector <int>> g_st(st.n), g_en(en.n);
  for (int i = 0; i < st.n; ++i) {
    int p = st.p[i];
    if (i != p) {
      g_st[p].push_back(i);
      g_st[i].push_back(p);
    }
  }
  for (int i = 0; i < en.n; ++i) {
    int p = en.p[i];
    if (i != p) {
      g_en[p].push_back(i);
      g_en[i].push_back(p);
    }
  }
  function <void(int, int, vector <vector <int>> &, vector <int> &, vector <int> &, vector <int>&)> dfs = [&] (int u, int p, vector <vector <int>> &g, vector <int> &l, vector <int> &r, vector <int> &e) {
    e.push_back(u);
    l[u] = (int)e.size() - 1;
    for (auto v : g[u]) {
      if (v != p) {
        dfs(v, u, g, l, r, e);
      }
    }
    r[u] = (int)e.size() - 1;
  };
  vector <int> l_st(st.n), r_st(st.n), e_st;
  dfs(st.n - 1, -1, g_st, l_st, r_st, e_st);
  vector <int> l_en(en.n), r_en(en.n), e_en;
  dfs(en.n - 1, -1, g_en, l_en, r_en, e_en);
  vector <Event> events;
  for (int i = 0; i < q; ++i) {
    events.emplace_back(l_st[where_st[i]] - 1, l_en[where_en[i]], r_en[where_en[i]], -1, i);
    events.emplace_back(r_st[where_st[i]], l_en[where_en[i]], r_en[where_en[i]], 1, i);
  }
  for (int i = 0; i < n; ++i) {
    events.emplace_back(l_st[i], l_en[i], -1, -1, -1);
  }
  sort(events.begin(), events.end());
  Fenwick F(en.n);
  vector <int> cnt(q);
  for (auto e : events) {
    if (e.id == -1) {
      F.modify(e.l, 1);
    } else {
      cnt[e.id] += e.tp * F.sum(e.l, e.r);
    }
  }   
  vector <int> ans(q);
  for (int i = 0; i < q; ++i) {
    if (cnt[i] > 0) ans[i] = 1;
    else ans[i] = 0;
  }
  return ans;
}    

#ifdef LOCAL
namespace {
int read_int() {
  int x;
  cin >> x;
  return x;
}

}  // namespace

int main() {
  ios_base::sync_with_stdio(false); cin.tie(0);
#ifdef LOCAL
  freopen("input.txt", "r", stdin);
#endif
  int N = read_int();
  int M = read_int();
  int Q = read_int();
  std::vector<int> X(M), Y(M), S(Q), E(Q), L(Q), R(Q);
  for (int j = 0; j < M; ++j) {
    X[j] = read_int();
    Y[j] = read_int();
  }
  for (int i = 0; i < Q; ++i) {
    S[i] = read_int();
    E[i] = read_int();
    L[i] = read_int();
    R[i] = read_int();
  }

  std::vector<int> A = check_validity(N, X, Y, S, E, L, R);
  for (size_t i = 0; i < A.size(); ++i) {
    printf("%d\n", A[i]);
  }
}
#endif

• Subtask 1: 7 / 7
• Subtask 2: 8 / 8
• Subtask 3: 0 / 34
• Subtask 4: 0 / 51