Submission #958739

#	Time	Username	Problem	Language	Result	Execution time	Memory
958739		ALTAKEXE	Cyberland (APIO23_cyberland)	C++17	97 / 100	783 ms	107500 KiB

cyberland

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define f first
#define s second
#define inf 1e18
#define dinf 1e-9
using namespace std;
vector<array<ll, 2>> adj[100000];
ll h;
bool visited[100000];
priority_queue<array<ld, 2>, vector<array<ld, 2>>, greater<array<ld, 2>>> pq[61];
ld dp[100000][61], ep = dinf;

void dfs(ll u)
{
  visited[u] = 1;
  for (auto [v, x] : adj[u])
  {
    if (v != h && !visited[v])
    {
      dfs(v);
    }
  }
}
double solve(int N, int M, int K, int H, std::vector<int> x, std::vector<int> y, std::vector<int> c, std::vector<int> arr)
{
  K = min(K, 80), h = H;
  for (int i = 0; i < N; ++i)
  {
    visited[i] = 0;
    adj[i].clear();
    for (int j = 0; j <= K; ++j)
    {
      dp[i][j] = 1e18;
    }
  }
  for (int i = 0; i < M; ++i)
  {
    adj[x[i]].push_back({y[i], c[i]});
    adj[y[i]].push_back({x[i], c[i]});
  }
  dfs(0);
  for (int i = 0; i < N; ++i)
  {
    if (visited[i] && (!arr[i] || !i))
    {
      dp[i][K] = 0;
      pq[K].push({0, (ld)i});
    }
  }
  for (int i = K; i >= 0; --i)
  {
    while (!pq[i].empty())
    {
      auto [w, du] = pq[i].top();
      pq[i].pop();
      ll u = (ll)du;
      if (dp[u][i] != w || u == H)
        continue;
      for (auto [v, x] : adj[u])
      {
        if (dp[v][i] - (w + (ld)x) > ep)
        {
          dp[v][i] = w + (ld)x;
          pq[i].push({dp[v][i], (ld)v});
        }
        if (i && arr[v] == 2 && (dp[v][i - 1] - (ld)(w + (ld)x) / 2) > ep)
        {
          dp[v][i - 1] = (w + (ld)x) / 2;
          pq[i - 1].push({dp[v][i - 1], (ld)v});
        }
      }
    }
  }
  ld f = inf;
  for (int i = 0; i <= K; ++i)
  {
    f = min(f, dp[H][i]);
  }
  if (f == inf)
    return -1;
  return f;
}

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 19 / 19
• Subtask 5: 7 / 7
• Subtask 6: 16 / 16
• Subtask 7: 29 / 29
• Subtask 8: 0 / 3