oj.uz

Submission #714323

# Submission time Handle Problem Language Result Execution time Memory
714323 2023-03-24T08:43:35 Z vjudge1 Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 36352 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);
    bool check[n + 1];
    for(int i = 1;i <= n;++i)check[i] = 0;
    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 && check[u])cout << "impossible\n";
        else{
            vector<int>tempo(n + 1, -1);
            queue<int>que;
            que.push(u);
            check[u] = 1;
            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:37:28: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   37 |         if(dists[u].size() == n + 1 && dists[u][v] != -1)cout << dists[u][v] << '\n';
      |            ~~~~~~~~~~~~~~~~^~~~~~~~
events.cpp:38:33: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   38 |         else if(dists[u].size() == n + 1 && dists[u][v] == -1 && check[u])cout << "impossible\n";
      |                 ~~~~~~~~~~~~~~~~^~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Execution timed out 1580 ms 3604 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 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 6 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 1540 KB Output is correct
7 Correct 18 ms 2304 KB Output is correct
8 Correct 22 ms 3404 KB Output is correct
9 Correct 8 ms 4316 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 6 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 1540 KB Output is correct
7 Correct 18 ms 2304 KB Output is correct
8 Correct 22 ms 3404 KB Output is correct
9 Correct 8 ms 4316 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 5 ms 468 KB Output is correct
13 Correct 6 ms 632 KB Output is correct
14 Correct 6 ms 724 KB Output is correct
15 Correct 10 ms 1492 KB Output is correct
16 Correct 20 ms 2380 KB Output is correct
17 Correct 27 ms 3412 KB Output is correct
18 Correct 8 ms 4308 KB Output is correct
19 Execution timed out 1583 ms 36352 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 6 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 1540 KB Output is correct
7 Correct 18 ms 2304 KB Output is correct
8 Correct 22 ms 3404 KB Output is correct
9 Correct 8 ms 4316 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 5 ms 340 KB Output is correct
13 Correct 5 ms 724 KB Output is correct
14 Correct 6 ms 724 KB Output is correct
15 Correct 10 ms 1540 KB Output is correct
16 Correct 20 ms 2260 KB Output is correct
17 Correct 20 ms 3412 KB Output is correct
18 Correct 8 ms 4436 KB Output is correct
19 Execution timed out 1564 ms 3712 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 1564 ms 3620 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 212 KB Output is correct
2 Execution timed out 1580 ms 3604 KB Time limit exceeded
3 Halted 0 ms 0 KB -