oj.uz

Submission #969164

# Submission time Handle Problem Language Result Execution time Memory
969164 2024-04-24T15:51:06 Z duckindog Werewolf (IOI18_werewolf) C++17
49 / 100
 1796 ms 37680 KB 
#include <bits/stdc++.h>
#include "werewolf.h"

using namespace std;

const int N = 200'000 + 10;
vector<int> ad[N];

int a[N], rvs[N], it;
void dfs(int u, int p = -1) { 
  a[it] = u; rvs[u] = it++;
  for (const auto& v : ad[u]) if (v != p) dfs(v, u);
}

int g[N << 2][2];
void build(int s, int l, int r) { 
  if (l == r) { 
    g[s][0] = g[s][1] = a[l];
    return;
  }
  int mid = l + r >> 1;
  build(s << 1, l, mid); build(s << 1 | 1, mid + 1, r);
  g[s][0] = min(g[s << 1][0], g[s << 1 | 1][0]);
  g[s][1] = max(g[s << 1][1], g[s << 1 | 1][1]);
}
int getmi(int s, int l, int r, int u, int v) { 
  if (v < l || u > r) return 200'000;
  if (u <= l && r <= v) return g[s][0];
  int mid = l + r >> 1;
  return min(getmi(s << 1, l, mid, u, v), getmi(s << 1 | 1, mid + 1, r, u, v));
}
int getma(int s, int l, int r, int u, int v) { 
  if (v < l || u > r) return -1;
  if (u <= l && r <= v) return g[s][1];
  int mid = l + r >> 1;
  return max(getma(s << 1, l, mid, u, v), getma(s << 1 | 1, mid + 1, r, u, v));
}

vector<int> check_validity(int n, vector<int> x, vector<int> y,
                                vector<int> s, vector<int> e,
                                vector<int> l, vector<int> r) {
  int m = x.size(), q = s.size();
  bool line = true;
  for (int i = 0; i < m; ++i) { 
    int u = x[i], v = y[i];
    ad[u].push_back(v);
    ad[v].push_back(u);
    line &= (ad[u].size() <= 2 && ad[v].size() <= 2);
  }

  if (n <= 3000 && m <= 6000 && q <= 3000) { 
    vector<int> answer;
    for (int i = 0; i < q; ++i) { 
      vector<vector<int>> f(n, vector<int>(2));
      vector<int> mk(n);
      
      for (int j = 0; j < n; ++j) mk[j] = (j < l[i] ? 0 : j <= r[i] ? 1 : 2);

      queue<int> que;
      f[s[i]][0] = f[s[i]][mk[s[i]] == 1] = true;
      que.push(s[i]);
      while (que.size()) { 
        auto u = que.front(); que.pop();
        for (const auto& v : ad[u]) { 
          if (f[v][0] && f[v][1]) continue;
          pair<int, int> pre = {f[v][0], f[v][1]};
          if (mk[v] >= 1) f[v][0] |= f[u][0];
          if (mk[v] <= 1) f[v][1] |= (f[u][1] || mk[v] == 1);
          if (make_pair(f[v][0], f[v][1]) != pre) que.push(v);
        }
      }
      
      answer.push_back(f[e[i]][1]);
    }
    return answer;
  }

  if (line) { 
    int root;
    for (int i = 0; i < n; ++i) if (ad[i].size() == 1) root = i;
    dfs(root);
    build(1, 0, n - 1);
    
    vector<int> answer;
    for (int i = 0; i < q; ++i) {
      if (rvs[s[i]] < rvs[e[i]]) { 
        int st = rvs[s[i]], ed = rvs[e[i]];
        int vegan = -1;
        { 
          int lt = st, rt = ed;
          while (lt <= rt) { 
            int mid = lt + rt >> 1;
            if (getma(1, 0, n - 1, mid, ed) > r[i]) lt = (vegan = mid) + 1;
            else rt = mid - 1;
          }
        }
        
        int meat = -1;
        { 
          int lt = st, rt = ed;
          while (lt <= rt) { 
            int mid = lt + rt >> 1;
            if (getmi(1, 0, n - 1, st, mid) < l[i]) rt = (meat = mid) - 1;
            else lt = mid + 1;
          }
        }
    
        if (meat == -1 || vegan == -1) { 
          answer.push_back(1);
          continue;
        }        
        
        if (meat <= vegan + 1) answer.push_back(0);
        else answer.push_back(1);

      } else { 
        int st = rvs[e[i]], ed = rvs[s[i]];
        int vegan = -1;
        { 
          int lt = st, rt = ed;
          while (lt <= rt) { 
            int mid = lt + rt >> 1;
            if (getma(1, 0, n - 1, st, mid) > r[i]) rt = (vegan = mid) - 1;
            else lt = mid + 1;
          }
        }
        
        int meat = -1;
        { 
          int lt = st, rt = ed;
          while (lt <= rt) { 
            int mid = lt + rt >> 1;
            if (getmi(1, 0, n - 1, mid, ed) < l[i]) lt = (meat = mid) + 1;
            else rt = mid - 1;;
          }
        }
        if (meat == -1 || vegan == -1) { 
          answer.push_back(1);
          continue;
        }

        if (meat >= vegan - 1) answer.push_back(0);
        else answer.push_back(1);
      }

    }
    return answer;
  }

}

Compilation message

werewolf.cpp: In function 'void build(int, int, int)':
werewolf.cpp:21:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   21 |   int mid = l + r >> 1;
      |             ~~^~~
werewolf.cpp: In function 'int getmi(int, int, int, int, int)':
werewolf.cpp:29:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   29 |   int mid = l + r >> 1;
      |             ~~^~~
werewolf.cpp: In function 'int getma(int, int, int, int, int)':
werewolf.cpp:35:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   35 |   int mid = l + r >> 1;
      |             ~~^~~
werewolf.cpp: In function 'std::vector<int> check_validity(int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
werewolf.cpp:92:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   92 |             int mid = lt + rt >> 1;
      |                       ~~~^~~~
werewolf.cpp:102:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  102 |             int mid = lt + rt >> 1;
      |                       ~~~^~~~
werewolf.cpp:122:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  122 |             int mid = lt + rt >> 1;
      |                       ~~~^~~~
werewolf.cpp:132:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  132 |             int mid = lt + rt >> 1;
      |                       ~~~^~~~
werewolf.cpp:150:1: warning: control reaches end of non-void function [-Wreturn-type]
  150 | }
      | ^
werewolf.cpp:81:8: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
   81 |     dfs(root);
      |     ~~~^~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 2 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 2 ms 6492 KB Output is correct
6 Correct 3 ms 6492 KB Output is correct
7 Correct 3 ms 6788 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 2 ms 6492 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 2 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 2 ms 6492 KB Output is correct
6 Correct 3 ms 6492 KB Output is correct
7 Correct 3 ms 6788 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 2 ms 6492 KB Output is correct
10 Correct 689 ms 7336 KB Output is correct
11 Correct 492 ms 7168 KB Output is correct
12 Correct 372 ms 7004 KB Output is correct
13 Correct 612 ms 7152 KB Output is correct
14 Correct 599 ms 7156 KB Output is correct
15 Correct 469 ms 7500 KB Output is correct

Subtask #3
34.0 / 34.0

# Verdict Execution time Memory Grader output
1 Correct 1604 ms 37148 KB Output is correct
2 Correct 1796 ms 37012 KB Output is correct
3 Correct 1721 ms 37172 KB Output is correct
4 Correct 1796 ms 37184 KB Output is correct
5 Correct 1689 ms 37164 KB Output is correct
6 Correct 1759 ms 37412 KB Output is correct
7 Correct 1749 ms 37660 KB Output is correct
8 Correct 1691 ms 37084 KB Output is correct
9 Correct 726 ms 36984 KB Output is correct
10 Correct 902 ms 37080 KB Output is correct
11 Correct 999 ms 37120 KB Output is correct
12 Correct 1285 ms 37184 KB Output is correct
13 Correct 1686 ms 37256 KB Output is correct
14 Correct 1662 ms 37248 KB Output is correct
15 Correct 1652 ms 37140 KB Output is correct
16 Correct 1683 ms 37680 KB Output is correct
17 Correct 1658 ms 37152 KB Output is correct

Subtask #4
0 / 51.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 2 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 2 ms 6492 KB Output is correct
6 Correct 3 ms 6492 KB Output is correct
7 Correct 3 ms 6788 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 2 ms 6492 KB Output is correct
10 Correct 689 ms 7336 KB Output is correct
11 Correct 492 ms 7168 KB Output is correct
12 Correct 372 ms 7004 KB Output is correct
13 Correct 612 ms 7152 KB Output is correct
14 Correct 599 ms 7156 KB Output is correct
15 Correct 469 ms 7500 KB Output is correct
16 Correct 1604 ms 37148 KB Output is correct
17 Correct 1796 ms 37012 KB Output is correct
18 Correct 1721 ms 37172 KB Output is correct
19 Correct 1796 ms 37184 KB Output is correct
20 Correct 1689 ms 37164 KB Output is correct
21 Correct 1759 ms 37412 KB Output is correct
22 Correct 1749 ms 37660 KB Output is correct
23 Correct 1691 ms 37084 KB Output is correct
24 Correct 726 ms 36984 KB Output is correct
25 Correct 902 ms 37080 KB Output is correct
26 Correct 999 ms 37120 KB Output is correct
27 Correct 1285 ms 37184 KB Output is correct
28 Correct 1686 ms 37256 KB Output is correct
29 Correct 1662 ms 37248 KB Output is correct
30 Correct 1652 ms 37140 KB Output is correct
31 Correct 1683 ms 37680 KB Output is correct
32 Correct 1658 ms 37152 KB Output is correct
33 Incorrect 1469 ms 36464 KB Output isn't correct
34 Halted 0 ms 0 KB -