oj.uz

Submission #589123

# Submission time Handle Problem Language Result Execution time Memory
589123 2022-07-04T09:31:25 Z 1zaid1 Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 1492 KB 
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'

const int M = 1e4+2;
struct rng {int l, r, i;};

signed main() {
    cin.tie(0)->sync_with_stdio(0);

    int n, q;
    cin >> n >> q;

    vector<rng> v(n);
    for (auto &[l, r, i]:v) cin >> l >> r;
    for (int i = 0; i < n; i++) v[i].i = i;

    bitset<100005> vis;
    while (q--) {
        int a, b;
        cin >> a >> b; a--; b--;
        if (a == b) {
            cout << 0 << endl;
            continue;
        }

        vis[b] = 1;
        int ans = 0;
        rng cr = v[b];
        while (true) {
            // cout << q << "I: "<< cr.i+1 << endl;
            rng tmp;
            bool ch = 0;
            int mn = INT_MAX;
            for (auto [l, r, i]:v) {
                if (!vis[i]) {
                    if (cr.l <= r && r <= cr.r) {
                        if (i == a) {
                            ans++; ch = 0;
                            break;
                        }

                        if (l < mn) {
                            ch = true;
                            tmp = {l, r, i};
                            mn = l;
                        }
                    }
                }
            }

            if (!ch) break;
            if (tmp.l < cr.l) cr = tmp;
            else break;
            ans++;
            vis[cr.i] = 1;
        } vis = 0;

        if (cr.l <= v[a].r && v[a].r <= cr.r) {
            cout << ans << endl;
        } else {
            cout << "impossible" << endl;
        }
    }

    return 0;
}
/*
8 5
1 2
3 4
1 5
6 7
5 10
10 20
15 20
999999999 1000000000
1 6
1 7
2 4
3 3
5 8

5 2
1 3
2 4
4 7
7 9
3 7
1 4
3 2
*/

Compilation message

events.cpp: In function 'int main()':
events.cpp:59:28: warning: 'tmp.rng::r' may be used uninitialized in this function [-Wmaybe-uninitialized]
   59 |         if (cr.l <= v[a].r && v[a].r <= cr.r) {
      |             ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
events.cpp:32:17: warning: 'tmp.rng::i' may be used uninitialized in this function [-Wmaybe-uninitialized]
   32 |             rng tmp;
      |                 ^~~
events.cpp:53:13: warning: 'tmp.rng::l' may be used uninitialized in this function [-Wmaybe-uninitialized]
   53 |             if (tmp.l < cr.l) cr = tmp;
      |             ^~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Execution timed out 1579 ms 1492 KB Time limit exceeded
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 0 ms 340 KB Output is correct
3 Correct 161 ms 340 KB Output is correct
4 Correct 35 ms 340 KB Output is correct
5 Correct 60 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 0 ms 212 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 161 ms 340 KB Output is correct
4 Correct 35 ms 340 KB Output is correct
5 Correct 60 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 168 ms 340 KB Output is correct
13 Correct 34 ms 340 KB Output is correct
14 Correct 53 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Execution timed out 1577 ms 340 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 0 ms 340 KB Output is correct
3 Correct 161 ms 340 KB Output is correct
4 Correct 35 ms 340 KB Output is correct
5 Correct 60 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 340 KB Output is correct
12 Correct 169 ms 340 KB Output is correct
13 Correct 37 ms 344 KB Output is correct
14 Correct 51 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Execution timed out 1585 ms 1492 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 1552 ms 1492 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 1579 ms 1492 KB Time limit exceeded
3 Halted 0 ms 0 KB -