Submission #486541

#	Time	Username	Problem	Language	Result	Execution time	Memory
486541		fun_day	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	62 ms	110464 KiB

skyscraper

#include <bits/stdc++.h>

using namespace std;

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n , m;
  cin >> n >> m;
  vector<vector<pair<int,int>>> adj(n + 1);
  const int N = 30000 + 10;
  bitset<N> vis[N];
  int s = -1 , d = -1;
  for(int i = 0 ; i < m ; i++){
    int a , b;
    cin >> a >> b;
    if(s == -1) s = a;
    else if(d == -1) d = a;
    if(vis[a][b]) continue;
    vis[a][b] = true;
    for(int j = a + b , cnt = 1 ; j < n ; j += b , cnt++){
      adj[a].emplace_back(j , cnt);
      if(vis[j][b]) break;
      vis[j][b] = true;
    }
    for(int j = a - b , cnt = 1 ; j >= 0 ; j -= b , cnt++){
      adj[a].emplace_back(j , cnt);
      if(vis[j][b]) break;
    }
  }
  priority_queue<pair<int,int> , vector<pair<int,int>> , greater<pair<int,int>>> pq;
  pq.emplace(0 , s);
  vector<int> dist(n + 1 , (int)1e9);
  dist[s] = 0;
  while(!pq.empty()){
    auto f = pq.top();
    pq.pop();
    if(f.second == d) break;
    if(f.first != dist[f.second]) continue;
    for(auto x : adj[f.second]){
      int node = x.first;
      int cost = x.second;
      if(dist[node] > f.first + cost){
        dist[node] = f.first + cost;
        pq.emplace(dist[node] , node);
      }
    }
  }
  if(dist[d] == (int)1e9) cout << -1 << '\n';
  else cout << dist[d] << '\n';
  return 0; 
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43