oj.uz

Submission #714312

# Submission time Handle Problem Language Result Execution time Memory
714312 2023-03-24T08:28:02 Z vjudge1 Event Hopping (BOI22_events) C++17
10 / 100
 31 ms 8320 KB 
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
#define MAX 1005
int n, q;
pair<int, int>events[MAX];
bool check[MAX];
int dists[MAX][MAX];
vector<int>g[MAX];
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> q;
    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';
//    }
    for(int i = 1;i <= n;++i){
        for(int j = 1;j <= n;++j){
            dists[i][j] = -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][v] != -1)cout << dists[u][v] << '\n';
        else if(dists[u][v] == -1 && check[u])cout << "impossible\n";
        else{
            queue<int>que;
            que.push(u);
            check[u] = 1;
            dists[u][u] = 0;
            while(!que.empty()){
                int cur = que.front();
                que.pop();
                for(int vv : g[cur]){
                    if(dists[u][vv] == -1){
                        dists[u][vv] = dists[u][cur] + 1;
                        que.push(vv);
                    }
                }
            }
            if(dists[u][v] == -1)cout << "impossible\n";
            else cout << dists[u][v] << '\n';
        }
    }
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Runtime error 1 ms 468 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 7 ms 4224 KB Output is correct
4 Correct 7 ms 4308 KB Output is correct
5 Correct 7 ms 4308 KB Output is correct
6 Correct 13 ms 5108 KB Output is correct
7 Correct 22 ms 5844 KB Output is correct
8 Correct 25 ms 6868 KB Output is correct
9 Correct 8 ms 8276 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 7 ms 4224 KB Output is correct
4 Correct 7 ms 4308 KB Output is correct
5 Correct 7 ms 4308 KB Output is correct
6 Correct 13 ms 5108 KB Output is correct
7 Correct 22 ms 5844 KB Output is correct
8 Correct 25 ms 6868 KB Output is correct
9 Correct 8 ms 8276 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 7 ms 4280 KB Output is correct
13 Correct 6 ms 4308 KB Output is correct
14 Correct 7 ms 4308 KB Output is correct
15 Correct 12 ms 5076 KB Output is correct
16 Correct 26 ms 5812 KB Output is correct
17 Correct 31 ms 6868 KB Output is correct
18 Correct 9 ms 8276 KB Output is correct
19 Runtime error 1 ms 468 KB Execution killed with signal 11
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 7 ms 4224 KB Output is correct
4 Correct 7 ms 4308 KB Output is correct
5 Correct 7 ms 4308 KB Output is correct
6 Correct 13 ms 5108 KB Output is correct
7 Correct 22 ms 5844 KB Output is correct
8 Correct 25 ms 6868 KB Output is correct
9 Correct 8 ms 8276 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 7 ms 4228 KB Output is correct
13 Correct 6 ms 4308 KB Output is correct
14 Correct 7 ms 4308 KB Output is correct
15 Correct 12 ms 5088 KB Output is correct
16 Correct 23 ms 5924 KB Output is correct
17 Correct 27 ms 6972 KB Output is correct
18 Correct 8 ms 8320 KB Output is correct
19 Runtime error 1 ms 468 KB Execution killed with signal 11
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 468 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Runtime error 1 ms 468 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -