oj.uz

Submission #599941

# Submission time Handle Problem Language Result Execution time Memory
599941 2022-07-20T10:10:21 Z TimDee Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 113080 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define forn(i,n) for (int i=0; i<n; ++i)
#define pb(x) push_back(x);
#define f first
#define s second

void solve() {
	int n, m; cin>>n>>m;
	vector<pair<int,int>> a(n);
	forn(i,n) cin>>a[i].first>>a[i].second;
	vector<vector<int>> adj(n);
	if (n<=5000) {

		forn(i,n) {
			forn(j,n) {
				if (i==j) continue;
				if (a[j].f<=a[i].s && a[i].s<=a[j].s) adj[i].pb(j);
			}
		}

	} else {

		set<pair<int,int>> s;
		forn(i,n) s.insert({a[i].s,i});

		auto p = s.end(); --p;
		for (;;--p) {
			auto x=*p; int i=x.s;
			auto it = s.upper_bound({a[i].f,-1});
			auto z=*it; if (z.f<a[x.s].f) ++it;
			while (it!=s.end() && (*it).f<=x.f) {
				if ((*it).s!=i) adj[(*it).s].pb(i);
				++it;
			}

			if (p==s.begin()) break;
		}

	}
	
	vector<int> vis(n,0);
	vector<int> dist(n,-1);
	forn(i,m) {
		int u,v; cin>>u>>v;
		--u, --v;
		queue<int> q;
		q.push(u);
		vis[u]=1, dist[u]=0;
		while (!q.empty()) {
			int u=q.front(); q.pop();
			if (u==v) break;
			for (auto v:adj[u]) {
				if (!vis[v]) {
					vis[v]=1;
					dist[v]=dist[u]+1;
					q.push(v);
				}
			}
		}
		if (dist[v]==-1) cout<<"impossible\n";
		else cout<<dist[v]<<'\n';
		dist.assign(n,-1);
		vis.assign(n,0);
	}
}

int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	solve();
	return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Execution timed out 1564 ms 13880 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 8 ms 340 KB Output is correct
4 Correct 6 ms 340 KB Output is correct
5 Correct 5 ms 340 KB Output is correct
6 Correct 10 ms 1892 KB Output is correct
7 Correct 25 ms 3548 KB Output is correct
8 Correct 21 ms 5716 KB Output is correct
9 Correct 52 ms 8408 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 8 ms 340 KB Output is correct
4 Correct 6 ms 340 KB Output is correct
5 Correct 5 ms 340 KB Output is correct
6 Correct 10 ms 1892 KB Output is correct
7 Correct 25 ms 3548 KB Output is correct
8 Correct 21 ms 5716 KB Output is correct
9 Correct 52 ms 8408 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 7 ms 348 KB Output is correct
13 Correct 5 ms 412 KB Output is correct
14 Correct 6 ms 384 KB Output is correct
15 Correct 9 ms 1876 KB Output is correct
16 Correct 18 ms 3568 KB Output is correct
17 Correct 19 ms 5716 KB Output is correct
18 Correct 59 ms 8404 KB Output is correct
19 Execution timed out 1588 ms 54872 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 8 ms 340 KB Output is correct
4 Correct 6 ms 340 KB Output is correct
5 Correct 5 ms 340 KB Output is correct
6 Correct 10 ms 1892 KB Output is correct
7 Correct 25 ms 3548 KB Output is correct
8 Correct 21 ms 5716 KB Output is correct
9 Correct 52 ms 8408 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 8 ms 340 KB Output is correct
13 Correct 7 ms 356 KB Output is correct
14 Correct 7 ms 408 KB Output is correct
15 Correct 10 ms 1880 KB Output is correct
16 Correct 18 ms 3644 KB Output is correct
17 Correct 18 ms 5716 KB Output is correct
18 Correct 47 ms 8408 KB Output is correct
19 Correct 495 ms 13880 KB Output is correct
20 Correct 278 ms 18548 KB Output is correct
21 Execution timed out 1563 ms 113080 KB Time limit exceeded
22 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1565 ms 13872 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Execution timed out 1564 ms 13880 KB Time limit exceeded
3 Halted 0 ms 0 KB -