oj.uz

Submission #745855

# Submission time Handle Problem Language Result Execution time Memory
745855 2023-05-21T08:48:55 Z vjudge1 Event Hopping (BOI22_events) C++14
10 / 100
 1500 ms 63492 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long;


int main(){

    int n, q;
    cin >> n >> q;
    vector<pair<int, int> > inter(n);


    for (int i = 0; i < n; i++){
        cin >> inter[i].first >> inter[i].second;
    }
    vector<vector<int> > graph(n);

    for (int i = 0; i < n; i++){
        for (int j = 0; j < n; j++){
            if (i == j) continue;
            if (inter[i].second <= inter[j].second && inter[i].second >= inter[j].first){
                graph[i].push_back(j);
            }
        }
    }

    vector<pair<pair<int, int>, int> > elso(n);
    vector<int> hely(n);
    for (int i = 0; i < n; i++){
        elso[i] = make_pair(inter[i], i);
    }

    sort(elso.begin(), elso.end());

    for (int i = 0; i < n; i++){
        hely[elso[i].second] = i;
    }

    if (n > 1000){
        
        vector<ll> tav(n, -1); 
        for (ll i = 0; i < n; i++){
            if (tav[i] != -1) continue;
            queue<ll> q;
            q.push(i);
            tav[i] = i*10000000;
            while(!q.empty()){
                ll pos = q.front();
                q.pop();
                for (ll x : graph[pos]){
                    if (tav[x] == -1){
                        tav[x] = tav[pos] + 1;
                        q.push(x);
                    }
                }
            }
        }
        for (int i = 0; i < q; i++){
            int a, b;
            cin >> a >> b;
            a--, b--;
            if (tav[b] - tav[a] < 0 || tav[b] - tav[a] > 999999){
                cout << "impossible" << endl;
            }
            else cout << tav[b] - tav[a] << endl;
        }
    }


    // for (int i = 0; i < n; i++){
    //     for (int x : graph[i]) cout << x << " ";
    //     cout << endl;
    // }

    for (int i = 0; i < q; i++){
        int s, e;
        cin >> s >> e;
        s--, e--;

        queue<int> q;
        q.push(s);
        vector<int> tav(n, -1); 
        tav [s] = 0;
        while(!q.empty()){
            int pos = q.front();
            q.pop();
            for (int x : graph[pos]){
                if (tav[x] == -1){
                    tav[x] = tav[pos] + 1;
                    q.push(x);
                }
            }
        }
        if (tav[e] == -1) {
            cout << "impossible" << endl;
        }
        else cout << tav[e] << endl;
    }


    return 0;
}

/*

5 2
1 3
2 4
4 7
7 9
3 7
1 4
3 2

*/

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Execution timed out 1573 ms 5748 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 1 ms 212 KB Output is correct
3 Correct 7 ms 340 KB Output is correct
4 Correct 6 ms 344 KB Output is correct
5 Correct 6 ms 340 KB Output is correct
6 Correct 12 ms 1108 KB Output is correct
7 Correct 22 ms 1876 KB Output is correct
8 Correct 23 ms 3028 KB Output is correct
9 Correct 101 ms 4368 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 1 ms 212 KB Output is correct
3 Correct 7 ms 340 KB Output is correct
4 Correct 6 ms 344 KB Output is correct
5 Correct 6 ms 340 KB Output is correct
6 Correct 12 ms 1108 KB Output is correct
7 Correct 22 ms 1876 KB Output is correct
8 Correct 23 ms 3028 KB Output is correct
9 Correct 101 ms 4368 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 9 ms 340 KB Output is correct
13 Correct 6 ms 304 KB Output is correct
14 Correct 7 ms 356 KB Output is correct
15 Correct 14 ms 1044 KB Output is correct
16 Correct 22 ms 1876 KB Output is correct
17 Correct 26 ms 2948 KB Output is correct
18 Correct 102 ms 4288 KB Output is correct
19 Runtime error 372 ms 63492 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 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 7 ms 340 KB Output is correct
4 Correct 6 ms 344 KB Output is correct
5 Correct 6 ms 340 KB Output is correct
6 Correct 12 ms 1108 KB Output is correct
7 Correct 22 ms 1876 KB Output is correct
8 Correct 23 ms 3028 KB Output is correct
9 Correct 101 ms 4368 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 8 ms 352 KB Output is correct
13 Correct 6 ms 340 KB Output is correct
14 Correct 6 ms 340 KB Output is correct
15 Correct 12 ms 1108 KB Output is correct
16 Correct 22 ms 1876 KB Output is correct
17 Correct 22 ms 2948 KB Output is correct
18 Correct 92 ms 4308 KB Output is correct
19 Execution timed out 1579 ms 5776 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 1538 ms 3716 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 1573 ms 5748 KB Time limit exceeded
3 Halted 0 ms 0 KB -