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Submission #673870

# Submission time Handle Problem Language Result Execution time Memory
673870 2022-12-22T10:17:02 Z stanislavpolyn Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 3220 KB 
#include <bits/stdc++.h>

#define fr(i, a, b) for (int i = (a); i <= (b); ++i)
#define rf(i, a, b) for (int i = (a); i >= (b); --i)
#define fe(x, y) for (auto& x : y)

#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define mt make_tuple

#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define pw(x) (1LL << (x))

using namespace std;

mt19937_64 rng(228);

#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <typename T>
using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define fbo find_by_order
#define ook order_of_key

template <typename T>
bool umn(T& a, T b) {
    return a > b ? a = b, 1 : 0;
}
template <typename T>
bool umx(T& a, T b) {
    return a < b ? a = b, 1 : 0;
}

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template <typename T>
using ve = vector<T>;

const int N = 1e5 + 5;

int n, q;
pii a[N];

int main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#else
    ios::sync_with_stdio(0);
    cin.tie(0);
#endif

    cin >> n >> q;

    fr (i, 1, n) {
        cin >> a[i].fi >> a[i].se;
    }

    fr (i, 1, q) {
        int s, e;
        cin >> s >> e;

        if (s == e) {
            cout << "0\n";
            continue;
        }

        if (a[s].se > a[e].se) {
            cout << "impossible\n";
            continue;
        }



        int v = s;
        int ans = 0;
        bool bad = 0;
        while (1) {
            if (a[v].se >= a[e].fi) {
                ans++;
                break;
            }

            int mx = -1e9;
            int mxI = -1;
            fr (i, 1, n) {
                if (a[i].fi <= a[v].se && a[i].se >= a[v].se) {
                    if (a[i].se <= a[e].se) {
                        if (umx(mx, a[i].se)) {
                            mxI = i;
                        }
                    }
                }
            }

            if (mx == a[v].se) {
                bad = 1;
                break;
            }
            v = mxI;
            ans++;
        }
        if (!bad) {
            cout << ans << "\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 1584 ms 3220 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 0 ms 328 KB Output is correct
3 Correct 193 ms 344 KB Output is correct
4 Correct 24 ms 340 KB Output is correct
5 Correct 35 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 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 0 ms 328 KB Output is correct
3 Correct 193 ms 344 KB Output is correct
4 Correct 24 ms 340 KB Output is correct
5 Correct 35 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 190 ms 340 KB Output is correct
13 Correct 24 ms 340 KB Output is correct
14 Correct 36 ms 352 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 1 ms 344 KB Output is correct
19 Execution timed out 1582 ms 600 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 212 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 193 ms 344 KB Output is correct
4 Correct 24 ms 340 KB Output is correct
5 Correct 35 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 193 ms 344 KB Output is correct
13 Correct 25 ms 340 KB Output is correct
14 Correct 37 ms 456 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 356 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Execution timed out 1561 ms 3020 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 1582 ms 3220 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 1584 ms 3220 KB Time limit exceeded
3 Halted 0 ms 0 KB -