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Submission #721577

# Submission time Handle Problem Language Result Execution time Memory
721577 2023-04-11T04:53:50 Z The_Samurai Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 524288 KB 
#include "bits/stdc++.h"

using namespace std;
using ll = long long;
int INF = 2e9;

struct node {
    int l, r, i;
};

bool comp(node a, node b) {
    if (a.r < b.r) return true;
    if (a.r > b.r) return false;
    return a.l < b.l;
}

void solve() {
    int n, q;
    cin >> n >> q;
    vector<node> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i].l >> a[i].r;
        a[i].i = i + 1;
    }
    sort(a.begin(), a.end(), comp);
    vector<int> ind(n + 1);
    for (int i = 0; i < n; i++) {
        ind[a[i].i] = i;
    }
    vector<vector<int>> can(n + 1, vector<int>(n + 1, -1));
    vector<vector<int>> g(n + 1);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (a[j].l <= a[i].r and a[i].r <= a[j].r) {
                g[i].emplace_back(j);
            }
        }
    }
    for (int i = 0; i < n; i++) {
        can[i][i] = 0;
        queue<int> pq;
        pq.push(i);
        while (!pq.empty()) {
            int u = pq.front();
            pq.pop();
            for (int v : g[u]) {
                if (can[i][v] == -1) {
                    can[i][v] = can[i][u] + 1;
                    pq.push(v);
                }
            }
        }
    }
    while (q--) {
        int si, ei;
        cin >> si >> ei;
        si = ind[si];
        ei = ind[ei];
        if (can[si][ei] == -1) cout << "impossible";
        else cout << can[si][ei];
        cout << '\n';
    }
}

int main() {
    ios_base::sync_with_stdio(false); cout.tie(nullptr); cin.tie(nullptr);

    int queries = 1;
#ifdef test_cases
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
//    cin >> queries;
#else
    //    cin >> queries;
#endif

    for (int test_case = 1; test_case <= queries; test_case++) {
        solve();
//        cout << '\n';
    }
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Runtime error 244 ms 524288 KB Execution killed with signal 9
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 12 ms 4308 KB Output is correct
4 Correct 8 ms 4308 KB Output is correct
5 Correct 11 ms 4356 KB Output is correct
6 Correct 55 ms 5140 KB Output is correct
7 Correct 172 ms 5844 KB Output is correct
8 Correct 208 ms 6868 KB Output is correct
9 Correct 1138 ms 8344 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 12 ms 4308 KB Output is correct
4 Correct 8 ms 4308 KB Output is correct
5 Correct 11 ms 4356 KB Output is correct
6 Correct 55 ms 5140 KB Output is correct
7 Correct 172 ms 5844 KB Output is correct
8 Correct 208 ms 6868 KB Output is correct
9 Correct 1138 ms 8344 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 12 ms 4376 KB Output is correct
13 Correct 9 ms 4308 KB Output is correct
14 Correct 12 ms 4356 KB Output is correct
15 Correct 60 ms 5140 KB Output is correct
16 Correct 182 ms 5948 KB Output is correct
17 Correct 198 ms 6976 KB Output is correct
18 Correct 1131 ms 8344 KB Output is correct
19 Execution timed out 1579 ms 128436 KB Time limit exceeded
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 12 ms 4308 KB Output is correct
4 Correct 8 ms 4308 KB Output is correct
5 Correct 11 ms 4356 KB Output is correct
6 Correct 55 ms 5140 KB Output is correct
7 Correct 172 ms 5844 KB Output is correct
8 Correct 208 ms 6868 KB Output is correct
9 Correct 1138 ms 8344 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 13 ms 4292 KB Output is correct
13 Correct 9 ms 4380 KB Output is correct
14 Correct 12 ms 4308 KB Output is correct
15 Correct 55 ms 5136 KB Output is correct
16 Correct 168 ms 5948 KB Output is correct
17 Correct 197 ms 6980 KB Output is correct
18 Correct 1199 ms 8356 KB Output is correct
19 Runtime error 233 ms 524288 KB Execution killed with signal 9
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 245 ms 524288 KB Execution killed with signal 9
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 Runtime error 244 ms 524288 KB Execution killed with signal 9
3 Halted 0 ms 0 KB -