oj.uz

Submission #280310

# Submission time Handle Problem Language Result Execution time Memory
280310 2020-08-22T15:47:47 Z Haunted_Cpp Hotspot (NOI17_hotspot) C++17
100 / 100
 1692 ms 1596 KB 
/**
 *  author: Haunted_Cpp
**/
 
#include <bits/stdc++.h>
using namespace std;
 
#pragma GCC optimize("Ofast")
#pragma GCC target("fma,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#pragma GCC optimize("unroll-loops")
 
template<typename T> ostream &operator << (ostream &os, const vector<T> &v) { os << '{'; string sep; for (const auto &x : v) os << sep << x, sep = ", "; return os << '}'; }
template<typename T, size_t size> ostream &operator << (ostream &os, const array<T, size> &arr) { os << '{'; string sep; for (const auto &x : arr) os << sep << x, sep = ", "; return os << '}'; }
template<typename A, typename B> ostream &operator << (ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ", " << p.second << ')'; }
 
void debug_out() { cerr << endl; }
template<typename Head, typename... Tail> void debug_out(Head H, Tail... T) { cerr << ' ' << H; debug_out(T...); }
 
#ifdef LOCAL
#define debug(...) cerr << "(" << #__VA_ARGS__ << "):", debug_out(__VA_ARGS__)
#else
#define debug(...) 47
#endif

const int MAX_N = 5000 + 5;
const int MAX_K = 2000 + 5;

vector<vector<int>> g(MAX_N);
vector<double> ans(MAX_N);

int solve(int node, int target, const vector<vector<int>> &dag, vector<int> &dp) {
  if (node == target) return 1;
  int &res = dp[node];
  if (~res) return res;
  res = 0;
  for (auto to : dag[node]) {
    res += solve(to, target, dag, dp);
  }
  return res;
}

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0); 
  int n, m;
  cin >> n >> m;
  for (int i = 0; i < m; i++) {
    int st, et;
    cin >> st >> et;
    g[st].emplace_back(et);
    g[et].emplace_back(st);
  }
  vector<vector<int>> a, b;
  auto bfs = [&](int source, int sink) {
    a.clear();
    b.clear();
    a.resize(MAX_N);
    b.resize(MAX_N);
    queue<int> q;
    vector<int> dist(n, 1e9);
    dist[sink] = 0;
    q.push(sink);
    while(!q.empty()) {
      int node = q.front();
      q.pop();
      for (auto to : g[node]) {
        if (dist[to] > dist[node] + 1) {
          dist[to] = dist[node] + 1;
          q.push(to);
        }
      }
    }
    function<void(int)> build_dag = [&](int node) {
      const int cur = dist[node];
      for (auto to : g[node]) {
        if (dist[to] == cur - 1) {
          a[node].emplace_back(to);
          b[to].emplace_back(node);
          build_dag(to);
        }
      }
    };
    build_dag(source);
    for (int i = 0; i < MAX_N; i++) {
      sort(a[i].begin(), a[i].end());
      sort(b[i].begin(), b[i].end());
      a[i].erase(unique(a[i].begin(), a[i].end()), a[i].end());
      b[i].erase(unique(b[i].begin(), b[i].end()), b[i].end());
    }
  };
  int k;
  cin >> k;
  vector<int> dp_a, dp_b;
  while(k--) {
    int source, sink;
    cin >> source >> sink;
    bfs(source, sink);
    dp_a = dp_b = vector<int>(MAX_N, -1);
    const int cnt_shortest = solve(source, sink, a, dp_a);
    if (cnt_shortest == 0) continue;
    for (int i = 0; i < n; i++) {
      int L = solve(i, sink, a, dp_a);
      int R = solve(i, source, b, dp_b);
      ans[i] += 1.0 * L / cnt_shortest * R;
    }
  }
  cout << (max_element(ans.begin(), ans.end()) - ans.begin()) << '\n';
  return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 768 KB Output is correct
2 Correct 1 ms 896 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 1 ms 768 KB Output is correct
7 Correct 1 ms 768 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 768 KB Output is correct
2 Correct 1 ms 896 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 1 ms 768 KB Output is correct
7 Correct 1 ms 768 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 768 KB Output is correct
10 Correct 1 ms 768 KB Output is correct
11 Correct 1 ms 768 KB Output is correct
12 Correct 1 ms 768 KB Output is correct
13 Correct 1 ms 768 KB Output is correct
14 Correct 1 ms 768 KB Output is correct

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 768 KB Output is correct
2 Correct 1 ms 896 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 1 ms 768 KB Output is correct
7 Correct 1 ms 768 KB Output is correct
8 Correct 14 ms 896 KB Output is correct
9 Correct 19 ms 896 KB Output is correct
10 Correct 23 ms 896 KB Output is correct
11 Correct 28 ms 896 KB Output is correct
12 Correct 25 ms 768 KB Output is correct
13 Correct 44 ms 768 KB Output is correct
14 Correct 49 ms 1016 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 768 KB Output is correct
2 Correct 1 ms 896 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 1 ms 768 KB Output is correct
7 Correct 1 ms 768 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 768 KB Output is correct
10 Correct 1 ms 768 KB Output is correct
11 Correct 1 ms 768 KB Output is correct
12 Correct 1 ms 768 KB Output is correct
13 Correct 1 ms 768 KB Output is correct
14 Correct 1 ms 768 KB Output is correct
15 Correct 14 ms 896 KB Output is correct
16 Correct 19 ms 896 KB Output is correct
17 Correct 23 ms 896 KB Output is correct
18 Correct 28 ms 896 KB Output is correct
19 Correct 25 ms 768 KB Output is correct
20 Correct 44 ms 768 KB Output is correct
21 Correct 49 ms 1016 KB Output is correct
22 Correct 15 ms 768 KB Output is correct
23 Correct 18 ms 768 KB Output is correct
24 Correct 22 ms 768 KB Output is correct
25 Correct 27 ms 768 KB Output is correct
26 Correct 30 ms 768 KB Output is correct
27 Correct 43 ms 888 KB Output is correct
28 Correct 49 ms 876 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 768 KB Output is correct
2 Correct 1 ms 896 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 1 ms 768 KB Output is correct
7 Correct 1 ms 768 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 768 KB Output is correct
10 Correct 1 ms 768 KB Output is correct
11 Correct 1 ms 768 KB Output is correct
12 Correct 1 ms 768 KB Output is correct
13 Correct 1 ms 768 KB Output is correct
14 Correct 1 ms 768 KB Output is correct
15 Correct 3 ms 896 KB Output is correct
16 Correct 2 ms 768 KB Output is correct
17 Correct 12 ms 896 KB Output is correct
18 Correct 8 ms 768 KB Output is correct
19 Correct 10 ms 896 KB Output is correct
20 Correct 5 ms 896 KB Output is correct
21 Correct 3 ms 768 KB Output is correct

Subtask #6
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 768 KB Output is correct
2 Correct 1 ms 896 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 1 ms 768 KB Output is correct
7 Correct 1 ms 768 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 768 KB Output is correct
10 Correct 1 ms 768 KB Output is correct
11 Correct 1 ms 768 KB Output is correct
12 Correct 1 ms 768 KB Output is correct
13 Correct 1 ms 768 KB Output is correct
14 Correct 1 ms 768 KB Output is correct
15 Correct 14 ms 896 KB Output is correct
16 Correct 19 ms 896 KB Output is correct
17 Correct 23 ms 896 KB Output is correct
18 Correct 28 ms 896 KB Output is correct
19 Correct 25 ms 768 KB Output is correct
20 Correct 44 ms 768 KB Output is correct
21 Correct 49 ms 1016 KB Output is correct
22 Correct 15 ms 768 KB Output is correct
23 Correct 18 ms 768 KB Output is correct
24 Correct 22 ms 768 KB Output is correct
25 Correct 27 ms 768 KB Output is correct
26 Correct 30 ms 768 KB Output is correct
27 Correct 43 ms 888 KB Output is correct
28 Correct 49 ms 876 KB Output is correct
29 Correct 3 ms 896 KB Output is correct
30 Correct 2 ms 768 KB Output is correct
31 Correct 12 ms 896 KB Output is correct
32 Correct 8 ms 768 KB Output is correct
33 Correct 10 ms 896 KB Output is correct
34 Correct 5 ms 896 KB Output is correct
35 Correct 3 ms 768 KB Output is correct
36 Correct 164 ms 896 KB Output is correct
37 Correct 404 ms 1024 KB Output is correct
38 Correct 1094 ms 1284 KB Output is correct
39 Correct 1692 ms 1272 KB Output is correct
40 Correct 152 ms 1024 KB Output is correct
41 Correct 716 ms 1560 KB Output is correct
42 Correct 1605 ms 1596 KB Output is correct
43 Correct 94 ms 896 KB Output is correct
44 Correct 80 ms 1024 KB Output is correct