Submission #940981

#	Time	Username	Problem	Language	Result	Execution time	Memory
940981		duckindog	Dreaming (IOI13_dreaming)	C++17	100 / 100	65 ms	15564 KiB

dreaming

#include <bits/stdc++.h>
#include "dreaming.h"
 
using namespace std;
 
const int N = 100'000 + 10;
vector<pair<int, int>> ad[N];
 
int f[N], trace[N];
bool mk[N];
vector<int> node;
void dfs(int u, int p = -1) { 
  mk[u] = true;
  node.push_back(u);
  trace[u] = p;
  for (const auto& [v, w] : ad[u]) { 
    if (v == p) continue;
    f[v] = f[u] + w;
    dfs(v, u);
  }
}
 
pair<int, int> findMid(int u) { 
  int v = u;
  for (int t = 0; t < 2; ++t) { 
    for (const auto& x : node) f[x] = 0;
    node.clear();
    dfs(u);
    for (const auto& x : node) if (f[v] < f[x]) v = x;
    u = v;
  }
  int ret = v;
  while (v != -1) { 
    if (max(f[v], f[u] - f[v]) < max(f[ret], f[u] - f[ret])) ret = v;
    v = trace[v];
  }
  return {max(f[ret], f[u] - f[ret]), ret};
}
 
int travelTime(int n, int m, int l, int A[],int B[],int T[]) { 
  for (int i = 0; i < m; ++i) { 
    int u = A[i], v = B[i], w = T[i];
    ad[u].push_back({v, w});
    ad[v].push_back({u, w});
  }

  memset(trace, -1, sizeof trace);
  vector<pair<int, int>> mid;
  for (int i = 0; i < n; ++i) { 
    if (mk[i]) continue;
    mid.push_back(findMid(i));
  }
  sort(mid.begin(), mid.end(), greater<>());

  for (const auto& x : mid) { 
    if (x == mid[0]) continue;
    int u = mid[0].second, v = x.second;
    ad[u].push_back({v, l});
    ad[v].push_back({u, l});
  }
 
  memset(f, 0, sizeof f);
  memset(trace, -1, sizeof trace);
  findMid(0);
 
  return *max_element(f, f + n);
}

• Subtask 1: 14 / 14
• Subtask 2: 10 / 10
• Subtask 3: 23 / 23
• Subtask 4: 18 / 18
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23