Submission #305527

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
305527	2020-09-23 12:56:57	rama_pang	Stations (IOI20_stations)	C++14	100 / 100	1065 ms	1448 KiB

stations

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#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> labels(n);
  vector<vector<int>> adj(n);
  for (int i = 0; i + 1 < n; i++) {
    adj[u[i]].emplace_back(v[i]);
    adj[v[i]].emplace_back(u[i]);
  }
  vector<int> st(n), et(n);
  int timer = 0;
  const function<void(int, int, int)> Dfs = [&](int u, int p, int odd) {
    st[u] = timer++;
    for (auto v : adj[u]) if (v != p) {
      Dfs(v, u, odd ^ 1);
    }
    et[u] = timer++;
    if (odd) {
      labels[u] = st[u];
    } else {
      labels[u] = et[u];
    }
  };
  Dfs(0, -1, 0);
  vector<int> coords = labels;
  sort(begin(coords), end(coords));
  for (int i = 0; i < n; i++) {
    labels[i] = lower_bound(begin(coords), end(coords), labels[i]) - begin(coords);
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 61 / 61