oj.uz

Submission #679548

# Submission time Handle Problem Language Result Execution time Memory
679548 2023-01-08T13:19:20 Z penguin133 Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 136840 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif

vector<int> lmao[100005];
int S[100005], E[100005], dist[100005];
int n, q;

void solve(){
	cin >> n >> q;
	for(int i=1;i<=n;i++)cin >> S[i] >> E[i];
	set <pi> st;
	for(int i=1;i<=n;i++)st.insert({E[i], i});
	for(int i=1;i<=n;i++){
		set<pi> :: iterator it = st.lower_bound({S[i], 0});
		while(it != st.end()){
			pi tmp = *it;
			if(tmp.fi > E[i])break;
			lmao[tmp.se].push_back(i);
			it++;
		}
	}
	
	while(q--){
		int x, y; cin >> x >> y;
		queue<int>qu;
		for(int i=1;i<=n;i++)dist[i] = 1e9;
		dist[x] = 0;
		qu.push(x);
		while(!qu.empty()){
			int a = qu.front(); qu.pop();
			for(auto i : lmao[a]){
				if(dist[i] > dist[a] + 1)dist[i] = dist[a] + 1, qu.push(i);
			}
		}
		if(dist[y] != 1e9)cout << dist[y] << '\n';
		else cout << "impossible\n";
	}
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message

events.cpp:49:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   49 | main(){
      | ^~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Execution timed out 1572 ms 14352 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 4 ms 2772 KB Output is correct
4 Correct 3 ms 2772 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 9 ms 4436 KB Output is correct
7 Correct 21 ms 6228 KB Output is correct
8 Correct 29 ms 8276 KB Output is correct
9 Correct 100 ms 10836 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 4 ms 2772 KB Output is correct
4 Correct 3 ms 2772 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 9 ms 4436 KB Output is correct
7 Correct 21 ms 6228 KB Output is correct
8 Correct 29 ms 8276 KB Output is correct
9 Correct 100 ms 10836 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 4 ms 2772 KB Output is correct
13 Correct 2 ms 2772 KB Output is correct
14 Correct 3 ms 2772 KB Output is correct
15 Correct 10 ms 4436 KB Output is correct
16 Correct 20 ms 6240 KB Output is correct
17 Correct 26 ms 8276 KB Output is correct
18 Correct 113 ms 10872 KB Output is correct
19 Execution timed out 1586 ms 62024 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 4 ms 2772 KB Output is correct
4 Correct 3 ms 2772 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 9 ms 4436 KB Output is correct
7 Correct 21 ms 6228 KB Output is correct
8 Correct 29 ms 8276 KB Output is correct
9 Correct 100 ms 10836 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 4 ms 2772 KB Output is correct
13 Correct 4 ms 2800 KB Output is correct
14 Correct 3 ms 2772 KB Output is correct
15 Correct 9 ms 4436 KB Output is correct
16 Correct 21 ms 6248 KB Output is correct
17 Correct 26 ms 8280 KB Output is correct
18 Correct 105 ms 10860 KB Output is correct
19 Correct 918 ms 14400 KB Output is correct
20 Correct 701 ms 20232 KB Output is correct
21 Execution timed out 1542 ms 136840 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 1581 ms 14300 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Execution timed out 1572 ms 14352 KB Time limit exceeded
3 Halted 0 ms 0 KB -