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Submission #967150

# Submission time Handle Problem Language Result Execution time Memory
967150 2024-04-21T10:57:27 Z vladilius Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 30804 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int inf = numeric_limits<int> :: max();
using pii = pair<int, int>;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, q; cin>>n>>q;
    vector<int> l(n + 1), r(n + 1);
    for (int i = 1; i <= n; i++){
        cin>>l[i]>>r[i];
    }
    
    vector<int> g[n + 1];
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= n; j++){
            if (i == j) continue;
            if (l[j] <= r[i] && r[i] <= r[j]){
                g[i].push_back(j);
            }
        }
    }
    
    auto get = [&](int x, int y){
        vector<int> ans(n + 1, inf);
        ans[x] = 0;

        priority_queue<pii, vector<pii>, less<pii>> pq;
        pq.push({0, x});
        while (!pq.empty()){
            auto [d, v] = pq.top(); pq.pop();
            d++;
            for (int i: g[v]){
                if (ans[i] > d){
                    ans[i] = d;
                    pq.push({d, i});
                }
            }
        }
        
        return ans[y];
    };
    
    while (q--){
        int s, f; cin>>s>>f;
        int out = get(s, f);
        if (out == inf){
            cout<<"impossible"<<"\n";
        }
        else {
            cout<<out<<"\n";
        }
    }
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Execution timed out 1514 ms 6112 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 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 6 ms 348 KB Output is correct
4 Correct 4 ms 528 KB Output is correct
5 Correct 5 ms 348 KB Output is correct
6 Correct 9 ms 1116 KB Output is correct
7 Correct 22 ms 2140 KB Output is correct
8 Correct 19 ms 3164 KB Output is correct
9 Correct 85 ms 4520 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 6 ms 348 KB Output is correct
4 Correct 4 ms 528 KB Output is correct
5 Correct 5 ms 348 KB Output is correct
6 Correct 9 ms 1116 KB Output is correct
7 Correct 22 ms 2140 KB Output is correct
8 Correct 19 ms 3164 KB Output is correct
9 Correct 85 ms 4520 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 6 ms 348 KB Output is correct
13 Correct 4 ms 348 KB Output is correct
14 Correct 5 ms 532 KB Output is correct
15 Correct 9 ms 1248 KB Output is correct
16 Correct 22 ms 1880 KB Output is correct
17 Correct 19 ms 3040 KB Output is correct
18 Correct 78 ms 4444 KB Output is correct
19 Execution timed out 1563 ms 30804 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 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 6 ms 348 KB Output is correct
4 Correct 4 ms 528 KB Output is correct
5 Correct 5 ms 348 KB Output is correct
6 Correct 9 ms 1116 KB Output is correct
7 Correct 22 ms 2140 KB Output is correct
8 Correct 19 ms 3164 KB Output is correct
9 Correct 85 ms 4520 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 6 ms 468 KB Output is correct
13 Correct 4 ms 348 KB Output is correct
14 Correct 5 ms 348 KB Output is correct
15 Correct 9 ms 1116 KB Output is correct
16 Correct 23 ms 2140 KB Output is correct
17 Correct 22 ms 3160 KB Output is correct
18 Correct 79 ms 4440 KB Output is correct
19 Execution timed out 1559 ms 5760 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1581 ms 6220 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 344 KB Output is correct
2 Execution timed out 1514 ms 6112 KB Time limit exceeded
3 Halted 0 ms 0 KB -