Submission #1014278

#	Time	Username	Problem	Language	Result	Execution time	Memory
1014278		aufan	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	311 ms	5836 KiB

skyscraper

#include <bits/stdc++.h>
// #define int long long
#define fi first
#define se second

using namespace std;

const int inf = 1e9;

int b[30000], p[30000], dist[30000];
vector<int> v[30000];
priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;

int32_t main()
{
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        
        int n, m;
        cin >> n >> m;

        for (int i = 0; i < m; i++) {
                cin >> b[i] >> p[i];

                v[b[i]].push_back(p[i]);
        }

        for (int i = 0; i < n; i++) {
                dist[i] = inf;
                sort(v[i].begin(), v[i].end());
                v[i].erase(unique(v[i].begin(), v[i].end()), v[i].end());
        }

        int ans = -1;
        dist[b[0]] = 0;
        pq.push({dist[b[0]], b[0]});
        while (!pq.empty()) {
                auto [w, x] = pq.top();
                pq.pop();

                if (w > dist[x]) continue;

                if (x == b[1]) {
                        ans = w;
                        break;
                }

                for (auto k : v[x]) {
                        int cost = w;
                        for (int i = x + k; i < n; i += k) {
                                cost += 1;
                                if (cost < dist[i]) {
                                        dist[i] = cost;
                                        pq.push({dist[i], i});
                                }
                        }

                        cost = w;
                        for (int i = x - k; i >= 0; i -= k) {
                                cost += 1;
                                if (cost < dist[i]) {
                                        dist[i] = cost;
                                        pq.push({dist[i], i});
                                }
                        }
                }
        }

        cout << ans << '\n';
        
        return 0;
}

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