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Submission #605049

# Submission time Handle Problem Language Result Execution time Memory
605049 2022-07-25T12:33:20 Z l_reho Event Hopping (BOI22_events) C++14
10 / 100
 1500 ms 524288 KB 
#include<bits/stdc++.h>
using namespace std;
 
#define ll long long

int N, Q;
vector<ll> S, E;
vector<array<ll, 3>> ranges;

vector<vector<ll>> dist;

void solve(){
	cin>>N>>Q;
	
	S.assign(N, 0);
	E.assign(N, 0);
	ranges.assign(N, array<ll, 3>());
	dist.assign(N, vector<ll>(N, INT_MAX));
	// graph.assign(N, vector<int>());
	
	
	for(int i = 0; i < N; i++){
		int s, e;
		cin>>s>>e;
		
		S[i] = s;
		E[i] = e;
		
		ranges[i] = {s, e, i};
	}
	
	sort(ranges.begin(), ranges.end(), [&](array<ll, 3> a, array<ll, 3> b){
		return a[1] > b[1];
	});
	
	
	
	for(int q = 0; q < Q; q++){
		int sq, eq;
		cin>>sq>>eq;
		sq--;
		eq--;
		queue<int> que;
		que.push(sq);
		dist[sq][sq] = 0;
		while(!que.empty()){
			int curr = que.front();
			
			que.pop();
			
			// vector<int> adj = graph[curr];
			// cerco il primo nodo tale che end di quel nodo è < se
			// posso trovarlo in O(logn)
			
			int node = -1;
			for(int j = 0; j < N; j++){
				if(dist[sq][ranges[j][2]] == INT_MAX &&  ranges[j][0] <= E[curr] && ranges[j][1] >= E[curr] && ranges[j][1] <= E[eq]) {
					node = ranges[j][2];
					if(node != -1){
						dist[sq][node] = dist[sq][curr] +1;
						que.push(node);
					}
				}
			}
			
		
			
			/*
			for(int a : adj){
				if(dist[sq][a] != INT_MAX) continue;
				
				dist[sq][a] = dist[sq][curr]+1;
				que.push(a);
			}
			*/
		}
		if(dist[sq][eq] == INT_MAX)
			cout<<"impossible"<<endl;
		else cout<<dist[sq][eq]<<endl;
		
	}
	
	
}
 
int main(){
	solve();
	return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Runtime error 189 ms 524288 KB Execution killed with signal 9
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 36 ms 8160 KB Output is correct
4 Correct 33 ms 8192 KB Output is correct
5 Correct 46 ms 8200 KB Output is correct
6 Correct 24 ms 8148 KB Output is correct
7 Correct 48 ms 8224 KB Output is correct
8 Correct 43 ms 8148 KB Output is correct
9 Correct 7 ms 8148 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 36 ms 8160 KB Output is correct
4 Correct 33 ms 8192 KB Output is correct
5 Correct 46 ms 8200 KB Output is correct
6 Correct 24 ms 8148 KB Output is correct
7 Correct 48 ms 8224 KB Output is correct
8 Correct 43 ms 8148 KB Output is correct
9 Correct 7 ms 8148 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 36 ms 8212 KB Output is correct
13 Correct 29 ms 8152 KB Output is correct
14 Correct 44 ms 8148 KB Output is correct
15 Correct 26 ms 8228 KB Output is correct
16 Correct 50 ms 8228 KB Output is correct
17 Correct 46 ms 8148 KB Output is correct
18 Correct 6 ms 8148 KB Output is correct
19 Execution timed out 1600 ms 196444 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 36 ms 8160 KB Output is correct
4 Correct 33 ms 8192 KB Output is correct
5 Correct 46 ms 8200 KB Output is correct
6 Correct 24 ms 8148 KB Output is correct
7 Correct 48 ms 8224 KB Output is correct
8 Correct 43 ms 8148 KB Output is correct
9 Correct 7 ms 8148 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 41 ms 8228 KB Output is correct
13 Correct 30 ms 8148 KB Output is correct
14 Correct 44 ms 8224 KB Output is correct
15 Correct 27 ms 8148 KB Output is correct
16 Correct 56 ms 8208 KB Output is correct
17 Correct 44 ms 8148 KB Output is correct
18 Correct 7 ms 8220 KB Output is correct
19 Runtime error 205 ms 524288 KB Execution killed with signal 9
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 197 ms 524288 KB Execution killed with signal 9
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 Runtime error 189 ms 524288 KB Execution killed with signal 9
3 Halted 0 ms 0 KB -