Submission #1256962

#	Time	Username	Problem	Language	Result	Execution time	Memory
1256962		xardkodych	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	0 / 100	1 ms	1096 KiB

skyscraper

// #pragma optimize("Ofast")
#include "bits/stdc++.h"
#define int long long
#define all(v) (v).begin(), (v).end()
#define pb push_back
#define em emplace_back
#define mp make_pair
#define F first
#define S second

using namespace std;
template<class C>
using vec = vector<C>;
using vi = vector<int>;
using vpi = vector<pair<int, int> >;
using pii = pair<int, int>;
#ifdef LOCAL
const int N = 100;
#else
const int N = 30001;
#endif

const int sqr = 170;
int cnt = 0;
int n, m;
int id[sqr][N];
vec<vpi> g;

int bfs1(int s, int t) {
  vi dp(cnt, LLONG_MAX);
  dp[s] = 0;
  set<pii> q;
  q.emplace(0, s);
  while (!q.empty()) {
    auto [d,v] = *q.begin();
    q.erase(q.begin());
    for (auto& [to, w] : g[v]) {
      int relax = d + w;
      if (dp[to] > relax) {
        q.erase({dp[to], to});
        q.emplace(dp[to] = relax, to);
      }
    }
  }
  return dp[t];
}

signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n >> m;
  for (int i = 0; i < sqr; i++) {
    for (int j = 0; j < n; j++) {
      id[i][j] = cnt++;
    }
  }
  g.resize(cnt);
  for (int i = 1; i < sqr; i++) {
    for (int j = 0; j < n; j++) {
      g[id[i][j]].em(id[0][j], 0);
      if (j - i >= 0) g[id[i][j]].em(id[i][j - i], 1);
      if (j + i < n) g[id[i][j]].em(id[i][j + i], 1);
    }
  }
  for (int i = 0; i < m; i++) {
    int b, p;
    cin >> b >> p;
    if (p >= sqr) {
      for (int j = b % p; j < n; j += p) {
        int w = abs(j - b) / p;
        g[id[0][b]].em(id[0][j], w);
      }
    } else {
      g[id[0][b]].em(id[p][b], 0);
    }
  }
  int ans = bfs1(0, 1);
  if (ans == LLONG_MAX) {
    cout << -1 << '\n';
  } else {
    cout << ans << '\n';
  }
}

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