Submission #1064886

#	Time	Username	Problem	Language	Result	Execution time	Memory
1064886		Osplei	Stations (IOI20_stations)	C++17	0 / 100	641 ms	25260 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
     
using namespace std;
     
#define pb push_back
     
vector <int> bfs (int n, int nodo, vector <int> grafo[1000005]){
  vector <int> aux(n);
  bool visto[1000005];
  queue <pair <int, int>> q;
     
  for (int i = 0; i < 1000005; i++) visto[i] = false;
     
  q.push({nodo, 0});
  aux[nodo] = 0;

  while (!q.empty()){
    pair <int, int> act = q.front();
    q.pop();
      
    if (visto[act.first] == true) continue;
      
    visto[act.first] = true;
      
    if (grafo[act.first].size() <= 2){
      for (auto i : grafo[act.first]) {
        if (visto[i] != true){
          q.push({i, act.second});   
          aux[i] = act.first + 1 + act.second;
        }
      }
    } else {
      int auxi = 2000;
      aux[act.first] = 1e9;

      for (auto i : grafo[act.first]) {
        if (visto[i] == true) continue;
        q.push({i, auxi});
        aux[i] = act.first + 1 + auxi;
        auxi += 2000;
      }
    }
  }
     
  return aux; 
}
     
vector <int> label(int n, int k, vector <int> u, vector <int> v) {
    	
  vector <int> grafo[1000005];
     
  for (int i = 0; i < u.size(); i++) {
    int a = u[i], b = v[i];
     
    grafo[a].pb(b);
    grafo[b].pb(a);
  }
     
  for (int i = 0; i < n; i++){
    if (grafo[i].size() == 1){
      vector <int> labels = bfs(n, i, grafo);
      //for (auto j : labels) cout << j << " ";
      return labels;
    }
  }
     
  return u;
    	
}
     
int find_next_station(int s, int t, vector <int> c) {
  int maxi = 1e9;
     
  if (c.size() == 1) return c[0];
    	
  if (s != maxi){

    if (t >= (s - (s % 2000)) + 2000 || t <= s) return min(c[0], c[1]);
    else {
      if (t > s) return max(c[0], c[1]);
      else return min(c[0], c[1]);
    }
    
  } else {

    for (auto i : c) {
      if ((i - (i % 2000)) + 2000 >= t && i <= t) return i;
    }
  }
}
     
    /*
     
    int main(){
      label(10, 1e9, {0, 1, 2, 3, 3, 3, 4, 6, 8}, {1, 2, 3, 4, 6, 8, 5, 7, 9});
    }

    */
     
    

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:53:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |   for (int i = 0; i < u.size(); i++) {
      |                   ~~^~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:91:1: warning: control reaches end of non-void function [-Wreturn-type]
   91 | }
      | ^

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