Submission #839232

#	Time	Username	Problem	Language	Result	Execution time	Memory
839232		tch1cherin	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	22 / 100	109 ms	220820 KiB

skyscraper

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

const int MAX_N = 30000;
const int C = 300;
vector<pair<int, int>> G[MAX_N * C];
int B[MAX_N], P[MAX_N];
int D[MAX_N * C];

void connect(int u, int v, int w, bool directed = false) {
  G[u].push_back({v, w});
  if (!directed) {
    G[v].push_back({u, w});
  }
}

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int N, M;
  cin >> N >> M;
  for (int i = 0; i < M; i++) {
    cin >> B[i] >> P[i];
    if (P[i] >= C) {
      for (int j = B[i] % P[i]; j < N; j += P[i]) {
        connect(B[i], j, abs(j - B[i]) / P[i], true);
      }
    } else {
      connect(B[i], B[i] + P[i] * N, 0, true);
    }
  }
  for (int i = 0; i < N; i++) {
    for (int power = 1; power < C; power++) {
      if (i - power >= 0) {
        connect(i + power * N, i + power * (N - 1), 1, true);
        connect(i + power * N, i - power, 1, true);
      }
      if (i + power < N) {
        connect(i + power * N, i + power * (N + 1), 1, true);
        connect(i + power * N, i + power, 1, true);
      }
    }
  }
  fill(D, D + MAX_N, INT_MAX);
  priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> Q;
  Q.push({D[B[0]] = 0, B[0]});
  while (!Q.empty()) {
    auto [d, u] = Q.top();
    Q.pop();
    if (d > D[u]) {
      continue;
    }
    for (auto [v, w] : G[u]) {
      if (D[u] + w < D[v]) {
        Q.push({D[v] = D[u] + w, v}); 
      }
    }
  }
  cout << (D[B[1]] == INT_MAX ? -1 : D[B[1]]) << "\n";
}

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