oj.uz

Submission #714324

# Submission time Handle Problem Language Result Execution time Memory
714324 2023-03-24T08:46:39 Z vjudge1 Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 36160 KB 
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
int n, q;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> q;
    vector<vector<int>>g(n + 1);
    pair<int, int>events[n + 1];
    for(int i = 1;i <= n;++i){
        cin >> events[i].first >> events[i].second;
    }
    for(int i = 1;i <= n;++i){
        for(int j = 1;j <= n;++j){
            if(i == j)continue;
            if(events[i].second >= events[j].first && events[i].second <= events[j].second){
                g[i].push_back(j);
            }
        }
    }
//    for(int i = 1;i <= n;++i){
//        cout << i << ": ";
//        for(int j : g[i]){
//            cout << j << " ";
//        }
//        cout << '\n';
//    }
    vector<vector<int>>dists(n + 1);
    for(int i = 0;i < q;++i){
        int u, v;
        cin >> u >> v;
        if(dists[u].size() == n + 1 && dists[u][v] != -1)cout << dists[u][v] << '\n';
        else if(dists[u].size() == n + 1 && dists[u][v] == -1)cout << "impossible\n";
        else{
            vector<int>tempo(n + 1, -1);
            queue<int>que;
            que.push(u);
            tempo[u] = 0;
            while(!que.empty()){
                int cur = que.front();
                que.pop();
                for(int vv : g[cur]){
                    if(tempo[vv] == -1){
                        tempo[vv] = tempo[cur] + 1;
                        que.push(vv);
                    }
                }
            }
            if(tempo[v] == -1)cout << "impossible\n";
            else cout << tempo[v] << '\n';
            swap(tempo, dists[u]);
        }
    }
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:35:28: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   35 |         if(dists[u].size() == n + 1 && dists[u][v] != -1)cout << dists[u][v] << '\n';
      |            ~~~~~~~~~~~~~~~~^~~~~~~~
events.cpp:36:33: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |         else if(dists[u].size() == n + 1 && dists[u][v] == -1)cout << "impossible\n";
      |                 ~~~~~~~~~~~~~~~~^~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Execution timed out 1574 ms 3740 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 5 ms 724 KB Output is correct
5 Correct 6 ms 724 KB Output is correct
6 Correct 10 ms 1504 KB Output is correct
7 Correct 18 ms 2356 KB Output is correct
8 Correct 20 ms 3300 KB Output is correct
9 Correct 8 ms 4352 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 5 ms 724 KB Output is correct
5 Correct 6 ms 724 KB Output is correct
6 Correct 10 ms 1504 KB Output is correct
7 Correct 18 ms 2356 KB Output is correct
8 Correct 20 ms 3300 KB Output is correct
9 Correct 8 ms 4352 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 6 ms 340 KB Output is correct
13 Correct 5 ms 640 KB Output is correct
14 Correct 6 ms 724 KB Output is correct
15 Correct 11 ms 1492 KB Output is correct
16 Correct 24 ms 2364 KB Output is correct
17 Correct 25 ms 3412 KB Output is correct
18 Correct 8 ms 4316 KB Output is correct
19 Execution timed out 1584 ms 36160 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 5 ms 724 KB Output is correct
5 Correct 6 ms 724 KB Output is correct
6 Correct 10 ms 1504 KB Output is correct
7 Correct 18 ms 2356 KB Output is correct
8 Correct 20 ms 3300 KB Output is correct
9 Correct 8 ms 4352 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 6 ms 340 KB Output is correct
13 Correct 6 ms 724 KB Output is correct
14 Correct 6 ms 724 KB Output is correct
15 Correct 10 ms 1500 KB Output is correct
16 Correct 19 ms 2372 KB Output is correct
17 Correct 22 ms 3356 KB Output is correct
18 Correct 9 ms 4308 KB Output is correct
19 Execution timed out 1571 ms 3536 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 1552 ms 3744 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 1574 ms 3740 KB Time limit exceeded
3 Halted 0 ms 0 KB -