Submission #836526

#	Time	Username	Problem	Language	Result	Execution time	Memory
836526		NeroZein	Stations (IOI20_stations)	C++17	Compilation error	0 ms	0 KiB

stations

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

std::vector<int> label(int n, int k, std::vector<int> eu, std::vector<int> ev) {
  std::vector<int> labels(n);
  vector<vector<int>> g(n); 
  for (int i = 0; i < n - 1; ++i) {
    g[ev[i]].push_back(eu[i]);
    g[eu[i]].push_back(ev[i]); 
  }
  int cnt = 0;
  function<void(int, int)> Dfs = [&](int v, int p) {
    labels[v] = cnt++; 
    for (int u : g[v]) {
      if (u != p) {
        Dfs(u, v); 
      }
    }
  };
  for (int i = 0; i < n; ++i) {
    if (g[v].size() == 1) {
      Dfs(i, i);
      break; 
    }
  }
  return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
  assert(c.size() <= 2); 
  int mn = min(s, t);
  int mx = max(s, t);
  for (int i : c) {
    if (mn <= i && i <= mx) {
      return i; 
    }
  }
  return 0; 
  //assert(false); 
}

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:23:11: error: 'v' was not declared in this scope
   23 |     if (g[v].size() == 1) {
      |           ^