Submission #462326

#	Time	Username	Problem	Language	Result	Execution time	Memory
462326		prvocislo	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	530 ms	262148 KiB

skyscraper

#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
typedef long long ll;
using namespace std;

const int sqrtn = 180, inf = 1e9 + 5;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    int k = sqrtn * n;
    vector<vector<pair<int, int> > > g(k);
    vector<int> b(m), p(m);
    for (int i = 0; i < m; i++)
    {
        cin >> b[i] >> p[i];
        if (p[i] < sqrtn)
        {
            g[b[i]].push_back({ p[i] * n + b[i], 0 });
        }
        else
        {
            for (int j = b[i] % p[i]; j < n; j += p[i])
            {
                g[b[i]].push_back({ j, abs(b[i] - j) / p[i] });
            }
        }
    }
    for (int step = 1; step < sqrtn; step++) for (int i = 0; i < n; i++)
    {
        if (i - step >= 0)
        {
            g[step * n + i].push_back({ step * n + i - step, 1 });
            g[step * n + i].push_back({ i - step, 1 });
        }
        if (i + step < n)
        {
            g[step * n + i].push_back({ step * n + i + step, 1 });
            g[step * n + i].push_back({ i + step, 1 });
        }
    }
    //cout << "\n";
    //for (int i = 0; i < k; i++) for (pair<int, int> j : g[i]) cout << i << " " << j.first << " " << j.second << "\n";
    priority_queue<pair<int, int> > pq;
    pq.push({ 0, b[0] });
    vector<int> dist(k, inf);
    while (!pq.empty())
    {
        int u = pq.top().second, d = -pq.top().first;
        //cout << u << endl;
        pq.pop();
        if (dist[u] != inf) continue;
        dist[u] = d;
        for (pair<int, int> i : g[u]) if (dist[i.first] == inf)
        {
            pq.push({ -(d + i.second), i.first });
        }
    }
    cout << (dist[b[1]] == inf ? -1 : dist[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