Submission #1050570

#	Time	Username	Problem	Language	Result	Execution time	Memory
1050570		VMaksimoski008	Event Hopping (BOI22_events)	C++17	10 / 100	121 ms	3288 KiB

events

#include <bits/stdc++.h>
//#define int long long

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;

signed main() {
    ios_base::sync_with_stdio(false);
    cout.tie(0); cin.tie(0);

    int n, q;
    cin >> n >> q;

    vector<pii> v(n+1);
    for(int i=1; i<=n; i++) cin >> v[i].first >> v[i].second;

    if(n <= 1000 && q <= 100) {
        while(q--) {
            int s, t;
            cin >> s >> t;

            vector<int> dist(n+1, -1);
            queue<int> q; q.push(s); dist[s] = 0;

            while(!q.empty()) {
                int u = q.front(); q.pop();

                for(int i=1; i<=n; i++) {
                    if(dist[i] != -1) continue;
                    if(v[i].first <= v[u].second && v[u].second <= v[i].second) {
                        dist[i] = dist[u] + 1;
                        q.push(i);
                    }
                }
            }

            if(dist[t] == -1) cout << "impossible\n";
            else cout << dist[t] << '\n';
        }

        return 0;
    }

    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30