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Submission #937716

# Submission time Handle Problem Language Result Execution time Memory
937716 2024-03-04T11:52:01 Z LucaIlie Event Hopping (BOI22_events) C++17
25 / 100
 1500 ms 8872 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 1e5;
const int MAX_LOG_N = 16;
const int MAX_T = 2e5;

struct event {
    int i, s, e;
};

int prv[MAX_LOG_N + 1][MAX_N + 1];
event events[MAX_N + 1];
map<int, int> nrm;

bool canSwitch( event a, event b ) {
    return (b.s <= a.e && a.e <= b.e);
}

int main() {
    int n, q;

    cin >> n >> q;
    for ( int i = 1; i <= n; i++ ) {
        cin >> events[i].s >> events[i].e;
        nrm[events[i].s] = nrm[events[i].e] = 1;
        events[i].i = i + 1;
    }
    int t = 0;
    for ( auto p: nrm )
        nrm[p.first] = ++t;
    for ( int i = 1; i <= n; i++ ) {
        events[i].s = nrm[events[i].s];
        events[i].e = nrm[events[i].e];
    }

    for ( int i = 1; i <= n; i++ ) {
        prv[0][i] = i;
        for ( int j = 1; j <= n; j++ ) {
            if ( canSwitch( events[j], events[i] )  ) {
                if ( events[j].s < events[prv[0][i]].s )
                    prv[0][i] = j;
            }
        }
    }

    for ( int p = 1; p <= MAX_LOG_N; p++ ) {
        for ( int i = 1; i <= n; i++ )
            prv[p][i] = prv[p - 1][prv[p - 1][i]];
    }

    while ( q-- ) {
        int s, e;
        cin >> s >> e;

        int i = e, x = 0;
        for ( int p = MAX_LOG_N; p >= 0; p-- ) {
            if ( events[prv[p][i]].s > events[s].e ) {
                i = prv[p][i];
                x += (1 << p);
            }
        }
        if ( events[i].s > events[s].e ) {
            i = prv[0][i];
            x++;
        }


        if ( s == e )
            cout << 0 << "\n";
        else if ( canSwitch( events[s], events[i] ) )
            cout << x + 1 << "\n";
        else
            cout << "impossible\n";
    }

    return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Execution timed out 1583 ms 7108 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 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 6 ms 6492 KB Output is correct
4 Correct 7 ms 6492 KB Output is correct
5 Correct 5 ms 6492 KB Output is correct
6 Correct 5 ms 6492 KB Output is correct
7 Correct 7 ms 6488 KB Output is correct
8 Correct 4 ms 6492 KB Output is correct
9 Correct 3 ms 6492 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 6 ms 6492 KB Output is correct
4 Correct 7 ms 6492 KB Output is correct
5 Correct 5 ms 6492 KB Output is correct
6 Correct 5 ms 6492 KB Output is correct
7 Correct 7 ms 6488 KB Output is correct
8 Correct 4 ms 6492 KB Output is correct
9 Correct 3 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 5 ms 6640 KB Output is correct
13 Correct 4 ms 6644 KB Output is correct
14 Correct 4 ms 6492 KB Output is correct
15 Correct 5 ms 6492 KB Output is correct
16 Correct 6 ms 6492 KB Output is correct
17 Correct 5 ms 6492 KB Output is correct
18 Correct 2 ms 6492 KB Output is correct
19 Correct 256 ms 7392 KB Output is correct
20 Correct 234 ms 7716 KB Output is correct
21 Correct 238 ms 8528 KB Output is correct
22 Correct 242 ms 8824 KB Output is correct
23 Correct 260 ms 8872 KB Output is correct
24 Correct 234 ms 8784 KB Output is correct
25 Correct 238 ms 8276 KB Output is correct

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 6 ms 6492 KB Output is correct
4 Correct 7 ms 6492 KB Output is correct
5 Correct 5 ms 6492 KB Output is correct
6 Correct 5 ms 6492 KB Output is correct
7 Correct 7 ms 6488 KB Output is correct
8 Correct 4 ms 6492 KB Output is correct
9 Correct 3 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6560 KB Output is correct
12 Correct 4 ms 6492 KB Output is correct
13 Correct 5 ms 6492 KB Output is correct
14 Correct 4 ms 6492 KB Output is correct
15 Correct 6 ms 6492 KB Output is correct
16 Correct 6 ms 6492 KB Output is correct
17 Correct 4 ms 6492 KB Output is correct
18 Correct 2 ms 6492 KB Output is correct
19 Execution timed out 1595 ms 7172 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 1513 ms 7252 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 6492 KB Output is correct
2 Execution timed out 1583 ms 7108 KB Time limit exceeded
3 Halted 0 ms 0 KB -