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Submission #1026491

# Submission time Handle Problem Language Result Execution time Memory
1026491 2024-07-18T06:53:58 Z gyg Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 21228 KB 
#pragma GCC optimize("O3", "unroll-loops")
#pragma GCC target("avx2")
#include <bits/stdc++.h>    
using namespace std;
using pii = pair<int, int>;
const int MAX_N = 1e5 + 5, INF = 1e9;

int n, q;
array<int, MAX_N> l, r;

vector<pii> ord; // {r, i}
int n_ccs;
unordered_map<int, int> cc;
array<int, MAX_N> cc_l, cc_r;
void precomp() {
    for (int i = 1; i <= n; i++) ord.push_back({r[i], i});
    sort(ord.rbegin(), ord.rend());

    set<int> coords;
    for (int i = 1; i <= n; i++) coords.insert(l[i]), coords.insert(r[i]);
    while (coords.size()) {
        n_ccs++, cc[*coords.begin()] = n_ccs;
        coords.erase(coords.begin());
    }

    for (int i = 1; i <= n; i++) cc_l[i] = cc[l[i]], cc_r[i] = cc[r[i]];
}

array<int, 8 * MAX_N> st;
void update(int l, int r, int x, int u = 1, int lo = 1, int hi = n_ccs) {
    if (l <= lo && hi <= r) { st[u] = min(st[u], x); return; }
    int mid = (lo + hi) / 2;
    if (l <= mid) update(l, r, x, 2 * u, lo, mid); 
    if (r > mid) update(l, r, x, 2 * u + 1, mid + 1, hi);
}
int query(int i, int u = 1, int lo = 1, int hi = n_ccs) {
    if (lo == hi) return st[u];
    int mid = (lo + hi) / 2;
    if (i <= mid) return min(st[u], query(i, 2 * u, lo, mid));
    else return min(st[u], query(i, 2 * u + 1, mid + 1, hi));
}

array<int, MAX_N> dp;
void comp(int f) {
    fill(st.begin() + 1, st.begin() + 4 * n_ccs, INF);

    for (pii x : ord) {
        int i = x.second;
        if (i == f) dp[i] = 0;
        else if (l[f] <= r[i] && r[i] <= r[f]) dp[i] = 1;
        else dp[i] = query(cc_r[i]) + 1;
        update(cc_l[i], cc_r[i], dp[i]);
    }
} 

int main() {
    // freopen("event.in", "r", stdin);
    cin.sync_with_stdio(false), cin.tie(0);

    cin >> n >> q;
    for (int i = 1; i <= n; i++) cin >> l[i] >> r[i];
    
    precomp();

    for (int i = 1; i <= q; i++) {
        int s, f; cin >> s >> f;
        comp(f);
        if (dp[s] >= INF) cout << "impossible" << '\n';
        else cout << dp[s] << '\n';
    }
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Execution timed out 1565 ms 13108 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 4440 KB Output is correct
2 Correct 1 ms 4440 KB Output is correct
3 Correct 5 ms 4444 KB Output is correct
4 Correct 6 ms 4444 KB Output is correct
5 Correct 6 ms 4444 KB Output is correct
6 Correct 8 ms 4440 KB Output is correct
7 Correct 12 ms 4700 KB Output is correct
8 Correct 13 ms 4700 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 4440 KB Output is correct
3 Correct 5 ms 4444 KB Output is correct
4 Correct 6 ms 4444 KB Output is correct
5 Correct 6 ms 4444 KB Output is correct
6 Correct 8 ms 4440 KB Output is correct
7 Correct 12 ms 4700 KB Output is correct
8 Correct 13 ms 4700 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 5 ms 4660 KB Output is correct
13 Correct 6 ms 4668 KB Output is correct
14 Correct 6 ms 4444 KB Output is correct
15 Correct 7 ms 4444 KB Output is correct
16 Correct 12 ms 4700 KB Output is correct
17 Correct 9 ms 4748 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Execution timed out 1594 ms 5144 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 4440 KB Output is correct
3 Correct 5 ms 4444 KB Output is correct
4 Correct 6 ms 4444 KB Output is correct
5 Correct 6 ms 4444 KB Output is correct
6 Correct 8 ms 4440 KB Output is correct
7 Correct 12 ms 4700 KB Output is correct
8 Correct 13 ms 4700 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4440 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 5 ms 4664 KB Output is correct
13 Correct 6 ms 4444 KB Output is correct
14 Correct 6 ms 4444 KB Output is correct
15 Correct 6 ms 4440 KB Output is correct
16 Correct 11 ms 4736 KB Output is correct
17 Correct 9 ms 4700 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 1179 ms 13016 KB Output is correct
20 Correct 1214 ms 13220 KB Output is correct
21 Correct 1440 ms 13100 KB Output is correct
22 Correct 1298 ms 16684 KB Output is correct
23 Execution timed out 1575 ms 21228 KB Time limit exceeded
24 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1546 ms 13108 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 4440 KB Output is correct
2 Execution timed out 1565 ms 13108 KB Time limit exceeded
3 Halted 0 ms 0 KB -