oj.uz

Submission #599943

# Submission time Handle Problem Language Result Execution time Memory
599943 2022-07-20T10:14:53 Z TimDee Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 54792 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;
		}

	}
	
	bitset<5000> vis;
	forn(i,m) {
		vis.reset();
		int u,v; cin>>u>>v;
		--u, --v;
		queue<pair<int,int>> q;
		q.push({u,0});
		vis.set(u);
		int foo=0;
		while (!q.empty()) {
			auto u=q.front(); q.pop();
			if (u.f==v) {
				foo=1;
				cout<<u.s<<'\n';
				break;
			}
			for (auto v:adj[u.f]) {
				if (!vis[v]) {
					vis.set(v);
					q.push({v,u.s+1});
				}
			}
		}
		if (foo) continue;
		cout<<"impossible\n";
	}
}

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 1 ms 212 KB Output is correct
2 Runtime error 100 ms 27572 KB Execution killed with signal 6
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 7 ms 380 KB Output is correct
4 Correct 5 ms 340 KB Output is correct
5 Correct 6 ms 340 KB Output is correct
6 Correct 10 ms 1876 KB Output is correct
7 Correct 16 ms 3620 KB Output is correct
8 Correct 17 ms 5588 KB Output is correct
9 Correct 48 ms 8404 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 7 ms 380 KB Output is correct
4 Correct 5 ms 340 KB Output is correct
5 Correct 6 ms 340 KB Output is correct
6 Correct 10 ms 1876 KB Output is correct
7 Correct 16 ms 3620 KB Output is correct
8 Correct 17 ms 5588 KB Output is correct
9 Correct 48 ms 8404 KB Output is correct
10 Correct 0 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 6 ms 340 KB Output is correct
14 Correct 8 ms 340 KB Output is correct
15 Correct 11 ms 1876 KB Output is correct
16 Correct 17 ms 3616 KB Output is correct
17 Correct 19 ms 5596 KB Output is correct
18 Correct 53 ms 8316 KB Output is correct
19 Execution timed out 1590 ms 54792 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 7 ms 380 KB Output is correct
4 Correct 5 ms 340 KB Output is correct
5 Correct 6 ms 340 KB Output is correct
6 Correct 10 ms 1876 KB Output is correct
7 Correct 16 ms 3620 KB Output is correct
8 Correct 17 ms 5588 KB Output is correct
9 Correct 48 ms 8404 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 9 ms 388 KB Output is correct
13 Correct 5 ms 360 KB Output is correct
14 Correct 7 ms 340 KB Output is correct
15 Correct 10 ms 1876 KB Output is correct
16 Correct 17 ms 3608 KB Output is correct
17 Correct 20 ms 5580 KB Output is correct
18 Correct 52 ms 8404 KB Output is correct
19 Runtime error 98 ms 27344 KB Execution killed with signal 6
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 106 ms 27368 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Runtime error 100 ms 27572 KB Execution killed with signal 6
3 Halted 0 ms 0 KB -