Submission #1320933

#	Time	Username	Problem	Language	Result	Execution time	Memory
1320933		kawhiet	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	57 / 100	1095 ms	65380 KiB

skyscraper

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

#define int long long

constexpr int inf = 1e18;

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    cin >> n >> m;
    vector<int> b(m), p(m);
    vector<set<int>> f(n);
    for (int i = 0; i < m; i++) {
        cin >> b[i] >> p[i];
        f[b[i]].insert(p[i]);
    }
    vector<vector<array<int, 2>>> g(n);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (i == j) continue;
            int x = abs(i - j);
            vector<int> d;
            for (int k = 1; k * k <= x; k++) {
                if (x % k == 0) {
                    d.push_back(k);
                    d.push_back(x / k);
                }
            }
            sort(d.rbegin(), d.rend());
            for (auto r : d) {
                if (f[i].count(r)) {
                    g[i].push_back({j, x / r});
                    break;
                }
            }
        }
    }
    vector<int> d(n, inf);
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> q;
    q.push({0, b[0]});
    while (!q.empty()) {
        auto [dist, u] = q.top();
        q.pop();
        if (d[u] < dist) continue;
        d[u] = dist;
        for (auto [v, w] : g[u]) {
            if (dist + w < d[v]) {
                d[v] = dist + w;
                q.push({d[v], v});
            }
        }
    }
    cout << (d[b[1]] == inf ? -1 : d[b[1]]) << '\n';
    return 0;
}

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