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Submission #721777

# Submission time Handle Problem Language Result Execution time Memory
721777 2023-04-11T07:13:33 Z drdilyor Event Hopping (BOI22_events) C++17
25 / 100
 1500 ms 18456 KB 
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
 
 
const int inf = 1e9 + 1e5;
struct event {
    int l, r, i;
};
 
int main() {
    int n, m;
    cin >> n >> m;
    vector<event> ev(n), og;
    map<int,int> comp;
    int _i = 0;
    for (auto& [s, e, i] : ev) {
        cin >> s >> e;
        comp[s] = comp[e] = 0;
        i = _i++;
    }
    int k = 0;
    for (auto& mp : comp)
        mp.second = k++;
    for (auto& [s, e, i] : ev)
        s = comp[s], e = comp[e];
 
    og = ev;
    sort(ev.begin(), ev.end(), [&](auto& a, auto& b) {
        return a.r == b.r ? a.l < b.l : a.r < b.r ;
    });
    //for (auto[a,b,c] : ev) cout << a << ' ' << b << ' ' << c <<'\n';
 
 
    while (m--) {
        int s, e;
        cin >> s >> e;
        s--;e--;
 
        if (s == e) {
            cout << "0\n";
            continue;
        }
 
 
        int si = 0, ei = 0;
        for (int j = 0; j < n; j++) {
            if (ev[j].i == s) si = j;
            if (ev[j].i == e) ei = j;
        }
 
        int res = 0;
        bool found = 0;
        int left = ev[ei].l;
        set<int> st;
        for (int j = n-1; j >= 0; j--) {
            auto [l,r,_i] = ev[j];
            if (r > ev[ei].r) continue;
            if (r < left) {
                if (st.empty()) break;
                left = *st.begin();
                if (r < left) break;
                st.clear();
                res++;
            }
            if (j == si) {
                res++;
                found = 1;
                break;
            }
            st.insert(l);
            continue;
        }
 
 
        if (found) cout << res << '\n';
        else cout << "impossible\n";
    }
 
    return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Execution timed out 1561 ms 8772 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 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 3 ms 312 KB Output is correct
5 Correct 3 ms 368 KB Output is correct
6 Correct 4 ms 312 KB Output is correct
7 Correct 6 ms 476 KB Output is correct
8 Correct 5 ms 468 KB Output is correct
9 Correct 2 ms 340 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 3 ms 312 KB Output is correct
5 Correct 3 ms 368 KB Output is correct
6 Correct 4 ms 312 KB Output is correct
7 Correct 6 ms 476 KB Output is correct
8 Correct 5 ms 468 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 5 ms 340 KB Output is correct
13 Correct 4 ms 316 KB Output is correct
14 Correct 4 ms 340 KB Output is correct
15 Correct 4 ms 340 KB Output is correct
16 Correct 6 ms 468 KB Output is correct
17 Correct 5 ms 468 KB Output is correct
18 Correct 1 ms 316 KB Output is correct
19 Execution timed out 1588 ms 1220 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 3 ms 312 KB Output is correct
5 Correct 3 ms 368 KB Output is correct
6 Correct 4 ms 312 KB Output is correct
7 Correct 6 ms 476 KB Output is correct
8 Correct 5 ms 468 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 6 ms 372 KB Output is correct
13 Correct 3 ms 340 KB Output is correct
14 Correct 3 ms 308 KB Output is correct
15 Correct 4 ms 368 KB Output is correct
16 Correct 6 ms 468 KB Output is correct
17 Correct 6 ms 440 KB Output is correct
18 Correct 2 ms 212 KB Output is correct
19 Correct 447 ms 7980 KB Output is correct
20 Correct 309 ms 7980 KB Output is correct
21 Correct 596 ms 10236 KB Output is correct
22 Correct 294 ms 10188 KB Output is correct
23 Correct 673 ms 18456 KB Output is correct
24 Correct 1029 ms 14036 KB Output is correct
25 Correct 91 ms 3892 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1588 ms 7328 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 1561 ms 8772 KB Time limit exceeded
3 Halted 0 ms 0 KB -