Submission #956208

#	Time	Username	Problem	Language	Result	Execution time	Memory
956208		Nelt	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	1 ms	348 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(i);
    map<ll, ll> dist[m];
    dist[0][b[0]] = 0;
    deque<pair<ll, ll>> q;
    q.push_front(make_pair(0, b[0]));
    while (!q.empty())
    {
        auto [i, j] = q.front();
        q.pop_front();
        if (j == b[1])
        {
            cout << dist[1][j] << endl;
            return;
        }
        if (j - p[i] >= 0 and !dist[i].count(j - p[i]))
            dist[i][j - p[i]] = dist[i][j] + 1, q.push_back(make_pair(i, j - p[i]));
        if (j + p[i] < n and !dist[i].count(j + p[i]))
            dist[i][j + p[i]] = dist[i][j] + 1, q.push_back(make_pair(i, j + p[i]));
        for (ll k : eq[j])
        {
            if (!dist[k].count(j))
                dist[k][j] = dist[i][j], q.push_front(make_pair(k, j));
            if (k == 1)
            {
                cout << dist[k][j] << endl;
                return;
            }
        }
        eq[j].clear();
    }
    cout << "-1\n";
}
 
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: 0 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43