oj.uz

Submission #653527

# Submission time Handle Problem Language Result Execution time Memory
653527 2022-10-27T08:25:20 Z prvocislo Event Hopping (BOI22_events) C++17
25 / 100
 1500 ms 22272 KB 
#include <algorithm>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <deque>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <string>
#include <vector>
typedef long long ll;
typedef long double ld;
using namespace std;

const int maxn = 2e5 + 5, logn = 18, inf = 1e9 + 5;
//const int maxn = 16, logn = 18, inf = 1e9 + 5;
vector<pair<int, int> > st(maxn * 2, { inf, inf });
int mini(int l, int r)
{
    pair<int, int> p = { inf, inf };
    for (l += maxn, r += maxn + 1; l < r; l >>= 1, r >>= 1)
    {
        if (l & 1) p = min(st[l++], p);
        if (r & 1) p = min(st[--r], p);
    }
    return p.second;
}
vector<vector<int> > l(logn, vector<int>(maxn, -1));
struct usek
{
    int l, r;
};
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, q;
    cin >> n >> q;
    vector<usek> u(n);
    vector<int> s;
    for (int i = 0; i < n; i++)
    {
        cin >> u[i].l >> u[i].r;
        s.push_back(u[i].l);
        s.push_back(u[i].r);
    }
    sort(s.begin(), s.end());
    for (int i = 0; i < n; i++)
    {
        u[i].l = lower_bound(s.begin(), s.end(), u[i].l) - s.begin();
        u[i].r = lower_bound(s.begin(), s.end(), u[i].r) - s.begin();
        st[maxn + u[i].r] = min(st[maxn + u[i].r], {u[i].l, i});
    }
    for (int i = maxn - 1; i > 0; i--) st[i] = min(st[i << 1], st[(i << 1) | 1]);
    while (q--)
    {
        int s, e;
        cin >> s >> e; 
        s--, e--;
        //cout << "                   ";
        if (s == e)
        {
            cout << "0\n";
            continue;
        }
        if (u[s].r > u[e].r)
        {
            cout << "impossible\n";
            continue;
        }
        if (u[e].l <= u[s].r)
        {
            cout << "1\n";
            continue;
        }
        int ans = 1;
        bool bad = false;
        while (u[e].l > u[s].r)
        {
            int mi = mini(u[e].l, u[e].r);
            if (mi == e)
            {
                bad = true;
                break;
            }
            ans++;
            e = mi;
        }
        if (!bad) cout << ans << "\n";
        else cout << "impossible\n";
    }
    return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 18260 KB Output is correct
2 Execution timed out 1580 ms 20184 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 18260 KB Output is correct
2 Correct 9 ms 18260 KB Output is correct
3 Correct 9 ms 18260 KB Output is correct
4 Correct 10 ms 18272 KB Output is correct
5 Correct 11 ms 18236 KB Output is correct
6 Correct 9 ms 18260 KB Output is correct
7 Correct 10 ms 18260 KB Output is correct
8 Correct 11 ms 18264 KB Output is correct
9 Correct 9 ms 18260 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 18260 KB Output is correct
2 Correct 9 ms 18260 KB Output is correct
3 Correct 9 ms 18260 KB Output is correct
4 Correct 10 ms 18272 KB Output is correct
5 Correct 11 ms 18236 KB Output is correct
6 Correct 9 ms 18260 KB Output is correct
7 Correct 10 ms 18260 KB Output is correct
8 Correct 11 ms 18264 KB Output is correct
9 Correct 9 ms 18260 KB Output is correct
10 Correct 9 ms 18356 KB Output is correct
11 Correct 8 ms 18260 KB Output is correct
12 Correct 9 ms 18260 KB Output is correct
13 Correct 9 ms 18260 KB Output is correct
14 Correct 10 ms 18268 KB Output is correct
15 Correct 9 ms 18260 KB Output is correct
16 Correct 9 ms 18248 KB Output is correct
17 Correct 9 ms 18260 KB Output is correct
18 Correct 12 ms 18260 KB Output is correct
19 Correct 1445 ms 19228 KB Output is correct
20 Execution timed out 1587 ms 18560 KB Time limit exceeded
21 Halted 0 ms 0 KB -

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 18260 KB Output is correct
2 Correct 9 ms 18260 KB Output is correct
3 Correct 9 ms 18260 KB Output is correct
4 Correct 10 ms 18272 KB Output is correct
5 Correct 11 ms 18236 KB Output is correct
6 Correct 9 ms 18260 KB Output is correct
7 Correct 10 ms 18260 KB Output is correct
8 Correct 11 ms 18264 KB Output is correct
9 Correct 9 ms 18260 KB Output is correct
10 Correct 8 ms 18268 KB Output is correct
11 Correct 10 ms 18304 KB Output is correct
12 Correct 12 ms 18260 KB Output is correct
13 Correct 11 ms 18312 KB Output is correct
14 Correct 13 ms 18260 KB Output is correct
15 Correct 13 ms 18344 KB Output is correct
16 Correct 10 ms 18260 KB Output is correct
17 Correct 10 ms 18260 KB Output is correct
18 Correct 9 ms 18276 KB Output is correct
19 Correct 248 ms 22148 KB Output is correct
20 Correct 103 ms 21332 KB Output is correct
21 Correct 80 ms 22012 KB Output is correct
22 Correct 81 ms 22272 KB Output is correct
23 Correct 72 ms 22076 KB Output is correct
24 Correct 75 ms 22120 KB Output is correct
25 Correct 44 ms 21424 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1585 ms 20184 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 18260 KB Output is correct
2 Execution timed out 1580 ms 20184 KB Time limit exceeded
3 Halted 0 ms 0 KB -