Submission #556170

#	Time	Username	Problem	Language	Result	Execution time	Memory
556170		Sweezy	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	175 ms	5360 KiB

skyscraper

#include <bits/stdc++.h>
 
using namespace std;
// #define int long long
 
const int inf = 1e9;
 
void solve() {
  int n, m;
  cin >> n >> m;
  vector<set<int>> doges(n);
  vector<pair<int, int>> doge(m);
  for (auto &[b, p] : doge) {
    cin >> b >> p;
    doges[b].insert(p);
  }
 
  vector<int> d(n, inf);
  vector<int> p_a(n, -1);
  d[doge[0].first] = 0;
  set<pair<int, int>> st;
  st.insert({0, doge[0].first});
  while (!st.empty()) {
    int v = st.begin()->second;
    if (v == doge[1].first) {
      cout << d[v];
      return;
    }
    st.erase(st.begin());
    for (auto &p : doges[v]) {
      for (int mul = 1; v + p * mul < n; mul++) {
        int nd = d[v] + mul;
        int r = v + p * mul;
        if (nd < d[r]) {
          st.erase({d[r], r});
          d[r] = nd;
          p_a[r] = p;
          st.insert({d[r], r});
        } else if (p_a[r] == p) {
          break;
        }
      }
      for (int mul = 1; v - p * mul >= 0; mul++) {
        int nd = d[v] + mul;
        int l = v - p * mul;
        if (nd < d[l]) {
          st.erase({d[l], l});
          d[l] = nd;
          p_a[l] = p;
          st.insert({d[l], l});
        } else if (p_a[l] == p) {
          break;
        }
      }
    }
  }
 
  cout << -1;
}
 
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  solve();
  return 0;
}

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