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Submission #745783

# Submission time Handle Problem Language Result Execution time Memory
745783 2023-05-21T07:42:44 Z vjudge1 Event Hopping (BOI22_events) C++17
0 / 100
 599 ms 204084 KB 
#include <iostream>
#include <vector>
using namespace std;

struct event {
    int s, e;
};

int n, q, a, b;
vector <event> v(5001);
vector <vector <int>> g(1e5 + 1);
vector <vector <int>> d(5001, vector <int>(5001, 1e9));
vector <bool> done(5001, false);

void dfs(int x) {
    if (done[x]) return;
    done[x] = true;
    for (int i : g[x]) {
        dfs(i);
        for (int j = 1; j <= n; j++) d[x][j] = min(d[x][j], d[i][j] + 1);
    }
}

int main()
{
    cin >> n >> q;
    for (int i = 1; i <= n; i++) {
        cin >> v[i].s >> v[i].e;
        d[i][i] = 0;
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= n; j++) {
            if (v[i].e >= v[j].s && v[i].e < v[j].e) g[i].push_back(j);
            if (v[i].e == v[j].e && v[i].s < v[j].s) g[i].push_back(j);
        }
    }
    for (int i = 1; i <= n; i++) dfs(i);
    for (int i = 0; i < q; i++) {
        cin >> a >> b;
        if (d[a][b] < 1e9) cout << d[a][b] << "\n";
        else cout << "impossible\n";
    }
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 100684 KB Output is correct
2 Runtime error 154 ms 204084 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 47 ms 100640 KB Output is correct
2 Correct 48 ms 100688 KB Output is correct
3 Correct 52 ms 100776 KB Output is correct
4 Correct 55 ms 100776 KB Output is correct
5 Correct 55 ms 100760 KB Output is correct
6 Correct 205 ms 101472 KB Output is correct
7 Correct 379 ms 102476 KB Output is correct
8 Correct 599 ms 103420 KB Output is correct
9 Incorrect 54 ms 100716 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 47 ms 100640 KB Output is correct
2 Correct 48 ms 100688 KB Output is correct
3 Correct 52 ms 100776 KB Output is correct
4 Correct 55 ms 100776 KB Output is correct
5 Correct 55 ms 100760 KB Output is correct
6 Correct 205 ms 101472 KB Output is correct
7 Correct 379 ms 102476 KB Output is correct
8 Correct 599 ms 103420 KB Output is correct
9 Incorrect 54 ms 100716 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 47 ms 100640 KB Output is correct
2 Correct 48 ms 100688 KB Output is correct
3 Correct 52 ms 100776 KB Output is correct
4 Correct 55 ms 100776 KB Output is correct
5 Correct 55 ms 100760 KB Output is correct
6 Correct 205 ms 101472 KB Output is correct
7 Correct 379 ms 102476 KB Output is correct
8 Correct 599 ms 103420 KB Output is correct
9 Incorrect 54 ms 100716 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 139 ms 204080 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 44 ms 100684 KB Output is correct
2 Runtime error 154 ms 204084 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -