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답안 #443046

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
443046 2021-07-09T14:14:01 Z peijar 늑대인간 (IOI18_werewolf) C++17
100 / 100
 998 ms 167660 KB 
#include "werewolf.h"
#include <bits/stdc++.h>
using namespace std;

const int MAXN = 2e5;
const int MAXP = 18;

vector<int> adj[MAXN], adjMin[MAXN], adjMax[MAXN];
vector<int> S, E;
int tin[MAXN], tout[MAXN];
int curTime;
int parMin[MAXP][MAXN], parMax[MAXP][MAXN];
int nbSommets, nbAretes, nbRequetes;
vector<int> ans;
vector<int> queryAtNode[MAXN];
int idMin[MAXN], largestMin[MAXN], idMax[MAXN], smallestMax[MAXN];

void dfs(int u) {
  tin[u] = curTime++;
  for (int v : adjMin[u])
    dfs(v);
  tout[u] = curTime++;
}

set<int> dfs2(int u) {
  vector<set<int>> childs = {{tin[u]}};
  for (int v : adjMax[u]) {
    childs.push_back(dfs2(v));
  }
  for (int i = 1; i < (int)childs.size(); ++i)
    if (childs[i].size() > childs[0].size())
      swap(childs[i], childs[0]);
  for (int i = 1; i < (int)childs.size(); ++i)
    for (auto v : childs[i])
      childs[0].insert(v);
  set<int> ret = move(childs[0]);
  for (int iRequete : queryAtNode[u]) {
    auto it = ret.lower_bound(tin[S[iRequete]]);
    if (it != ret.end() and *it <= tout[S[iRequete]])
      ans[iRequete] = 1;
  }
  return ret;
}

// Min tree : We want the minimum vertex on a path to be the largest possible.

int findMin(int u) { return idMin[u] < 0 ? u : idMin[u] = findMin(idMin[u]); }

int findMax(int u) { return idMax[u] < 0 ? u : idMax[u] = findMax(idMax[u]); }

void mergeMin(int a, int b) {
  a = findMin(a), b = findMin(b);
  if (a == b)
    return;
  if (largestMin[a] < largestMin[b])
    swap(a, b);
  parMin[0][largestMin[a]] = largestMin[b];
  adjMin[largestMin[b]].push_back(largestMin[a]);
  idMin[a] += idMin[b];
  idMin[b] = a;
  largestMin[a] = largestMin[b];
}

void mergeMax(int a, int b) {
  a = findMax(a), b = findMax(b);
  if (a == b)
    return;
  if (smallestMax[a] > smallestMax[b])
    swap(a, b);
  parMax[0][smallestMax[a]] = smallestMax[b];
  adjMax[smallestMax[b]].push_back(smallestMax[a]);
  idMax[a] += idMax[b];
  idMax[b] = a;
  smallestMax[a] = smallestMax[b];
}

vector<int> check_validity(int N, vector<int> X, vector<int> Y, vector<int> _S,
                           vector<int> _E, vector<int> L, vector<int> R) {
  S = _S, E = _E;
  nbSommets = N;
  nbAretes = X.size();
  for (int i = 0; i < nbAretes; ++i) {
    adj[X[i]].push_back(Y[i]);
    adj[Y[i]].push_back(X[i]);
  }
  for (int i = 0; i < nbSommets; ++i) {
    largestMin[i] = smallestMax[i] = i;
    idMin[i] = idMax[i] = -1;
  }
  for (int i = nbSommets - 1; i >= 0; --i)
    for (int j : adj[i])
      if (j > i) {
        mergeMin(j, i);
      }
  for (int i = 0; i < nbSommets; ++i)
    for (int j : adj[i])
      if (j < i)
        mergeMax(j, i);
  parMax[0][nbSommets - 1] = nbSommets - 1;

  for (int p = 0; p < MAXP - 1; ++p)
    for (int i = 0; i < nbSommets; ++i) {
      parMax[p + 1][i] = parMax[p][parMax[p][i]];
      parMin[p + 1][i] = parMin[p][parMin[p][i]];
    }

  nbRequetes = S.size();
  for (int i = 0; i < nbRequetes; ++i)
    for (int p = MAXP - 1; p >= 0; --p)
      if (parMin[p][S[i]] >= L[i])
        S[i] = parMin[p][S[i]];
  ans.resize(nbRequetes);

  for (int i = 0; i < nbRequetes; ++i)
    for (int p = MAXP - 1; p >= 0; --p)
      if (parMax[p][E[i]] <= R[i])
        E[i] = parMax[p][E[i]];
  for (int i = 0; i < nbRequetes; ++i)
    queryAtNode[E[i]].push_back(i);
  dfs(0);
  dfs2(nbSommets - 1);
  return ans;
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 19276 KB Output is correct
2 Correct 13 ms 19404 KB Output is correct
3 Correct 13 ms 19276 KB Output is correct
4 Correct 13 ms 19216 KB Output is correct
5 Correct 13 ms 19336 KB Output is correct
6 Correct 13 ms 19276 KB Output is correct
7 Correct 13 ms 19296 KB Output is correct
8 Correct 13 ms 19264 KB Output is correct
9 Correct 13 ms 19280 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 19276 KB Output is correct
2 Correct 13 ms 19404 KB Output is correct
3 Correct 13 ms 19276 KB Output is correct
4 Correct 13 ms 19216 KB Output is correct
5 Correct 13 ms 19336 KB Output is correct
6 Correct 13 ms 19276 KB Output is correct
7 Correct 13 ms 19296 KB Output is correct
8 Correct 13 ms 19264 KB Output is correct
9 Correct 13 ms 19280 KB Output is correct
10 Correct 19 ms 20688 KB Output is correct
11 Correct 18 ms 20568 KB Output is correct
12 Correct 18 ms 20440 KB Output is correct
13 Correct 19 ms 21340 KB Output is correct
14 Correct 19 ms 21324 KB Output is correct
15 Correct 20 ms 20600 KB Output is correct

Subtask #3
34.0 / 34.0

# 결과 실행 시간 메모리 Grader output
1 Correct 831 ms 94248 KB Output is correct
2 Correct 837 ms 120680 KB Output is correct
3 Correct 775 ms 104664 KB Output is correct
4 Correct 733 ms 98980 KB Output is correct
5 Correct 720 ms 98856 KB Output is correct
6 Correct 777 ms 99508 KB Output is correct
7 Correct 847 ms 101768 KB Output is correct
8 Correct 816 ms 120900 KB Output is correct
9 Correct 589 ms 104640 KB Output is correct
10 Correct 530 ms 98612 KB Output is correct
11 Correct 542 ms 98424 KB Output is correct
12 Correct 601 ms 98880 KB Output is correct
13 Correct 880 ms 137116 KB Output is correct
14 Correct 888 ms 137156 KB Output is correct
15 Correct 882 ms 137188 KB Output is correct
16 Correct 908 ms 137064 KB Output is correct
17 Correct 798 ms 101496 KB Output is correct

Subtask #4
51.0 / 51.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 19276 KB Output is correct
2 Correct 13 ms 19404 KB Output is correct
3 Correct 13 ms 19276 KB Output is correct
4 Correct 13 ms 19216 KB Output is correct
5 Correct 13 ms 19336 KB Output is correct
6 Correct 13 ms 19276 KB Output is correct
7 Correct 13 ms 19296 KB Output is correct
8 Correct 13 ms 19264 KB Output is correct
9 Correct 13 ms 19280 KB Output is correct
10 Correct 19 ms 20688 KB Output is correct
11 Correct 18 ms 20568 KB Output is correct
12 Correct 18 ms 20440 KB Output is correct
13 Correct 19 ms 21340 KB Output is correct
14 Correct 19 ms 21324 KB Output is correct
15 Correct 20 ms 20600 KB Output is correct
16 Correct 831 ms 94248 KB Output is correct
17 Correct 837 ms 120680 KB Output is correct
18 Correct 775 ms 104664 KB Output is correct
19 Correct 733 ms 98980 KB Output is correct
20 Correct 720 ms 98856 KB Output is correct
21 Correct 777 ms 99508 KB Output is correct
22 Correct 847 ms 101768 KB Output is correct
23 Correct 816 ms 120900 KB Output is correct
24 Correct 589 ms 104640 KB Output is correct
25 Correct 530 ms 98612 KB Output is correct
26 Correct 542 ms 98424 KB Output is correct
27 Correct 601 ms 98880 KB Output is correct
28 Correct 880 ms 137116 KB Output is correct
29 Correct 888 ms 137156 KB Output is correct
30 Correct 882 ms 137188 KB Output is correct
31 Correct 908 ms 137064 KB Output is correct
32 Correct 798 ms 101496 KB Output is correct
33 Correct 811 ms 104588 KB Output is correct
34 Correct 338 ms 54216 KB Output is correct
35 Correct 904 ms 117076 KB Output is correct
36 Correct 771 ms 102408 KB Output is correct
37 Correct 896 ms 113220 KB Output is correct
38 Correct 808 ms 105192 KB Output is correct
39 Correct 981 ms 166440 KB Output is correct
40 Correct 899 ms 122920 KB Output is correct
41 Correct 669 ms 108996 KB Output is correct
42 Correct 619 ms 100756 KB Output is correct
43 Correct 998 ms 131208 KB Output is correct
44 Correct 828 ms 111796 KB Output is correct
45 Correct 887 ms 167660 KB Output is correct
46 Correct 813 ms 167236 KB Output is correct
47 Correct 944 ms 137260 KB Output is correct
48 Correct 862 ms 137156 KB Output is correct
49 Correct 867 ms 137388 KB Output is correct
50 Correct 891 ms 137120 KB Output is correct
51 Correct 801 ms 122908 KB Output is correct
52 Correct 789 ms 123456 KB Output is correct