Submission #956800

#	Time	Username	Problem	Language	Result	Execution time	Memory
956800		Nelt	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	581 ms	8312 KiB

skyscraper

#include <bits/stdc++.h>
#define ll long long
#define endl "\n"
using namespace std;
 
void solve()
{
    ll n, m;
    cin >> n >> m;
    ll b[m], p[m];
    vector<ll> eq[n];
    for (ll i = 0; i < m; i++)
        cin >> b[i] >> p[i], eq[b[i]].push_back(p[i]);
    for (ll i = 0; i < n; i++)
        sort(eq[i].begin(), eq[i].end(), greater());
    ll dist[n];
    for (ll i = 0; i < n; i++)
        dist[i] = 1e18;
    dist[b[0]] = 0;
    priority_queue<pair<ll, ll>, vector<pair<ll, ll>>, greater<pair<ll, ll>>> q;
    q.push(make_pair(0, b[0]));
    while (!q.empty())
    {
        auto [w, i] = q.top();
        q.pop();
        if (dist[i] < w)
            continue;
        for (ll j : eq[i])
        {
            for (ll k = i - j, cur = 0; k >= 0; k -= j)
            {
                cur++;
                if (dist[k] > w + cur)
                    q.push(make_pair(dist[k] = w + cur, k));
            }
            for (ll k = i + j, cur = 0; k < n; k += j)
            {
                cur++;
                if (dist[k] > w + cur)
                    q.push(make_pair(dist[k] = w + cur, k));
            }
        }
    }
    if (dist[b[1]] == 1e18)
        dist[b[1]] = -1;
    cout << dist[b[1]] << endl;
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll t = 1;
    // precomp();
    // cin >> t;
    for (ll i = 1; i <= t; i++)
        solve();
    cerr << "\nTime elapsed: " << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}

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