Submission #306073

#	Time	Username	Problem	Language	Result	Execution time	Memory
306073		eriksuenderhauf	Stations (IOI20_stations)	C++17	0 / 100	6 ms	512 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
using namespace std;

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
  vector<int> deg(n);
  vector<vector<int>> adj(n);
  for (int i = 0; i < n - 1; i++)
    deg[u[i]]++, deg[v[i]]++, adj[u[i]].push_back(v[i]), adj[v[i]].push_back(u[i]);;
  vector<int> labels(n);
  function<void(int,int)> init = [&](int u, int p) {
    if (~p) adj[u].erase(find(adj[u].begin(), adj[u].end(), p));
    for (int v: adj[u])
      init(v, u);
  };
  init(0, -1);
  function<void(int,int)> dfs;
  function<void(int,int,int,int)> join = [&](int u, int l, int r, int v) {
    if (l > r) return;
    if (l == r)
      dfs(adj[u][l], v);
    else {
      int m = (l+r) / 2;
      join(u, l, m, v*2+1);
      join(u, m+1, r, v*2+2);
    }
  };
  dfs = [&](int u, int l) {
    labels[u] = l;
    join(u, 0, adj[u].size()-1, l);
  };
  dfs(0, 0);
  return labels;
}

int find_next_station(int s, int t, vector<int> c) {
  set<int> tmp; for (int x: c) tmp.insert(x+1);
  int y = t+1;
  if (tmp.count(y)) return y-1;
  while (y > 0) {
    y /= 2;
    if (tmp.count(y))
      return y-1;
  }
  return *min_element(c.begin(), c.end());
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 0 / 10
• Subtask 5: 0 / 61