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Submission #696600

# Submission time Handle Problem Language Result Execution time Memory
696600 2023-02-07T01:01:49 Z jhwest2 Event Hopping (BOI22_events) C++17
100 / 100
 137 ms 17972 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 101010;

int n, q, l[N], r[N], w[N], go[20][N], ans[N];
vector<array<int, 2>> query[N];

int main() {
    cin.tie(0); ios_base::sync_with_stdio(0);
    cin >> n >> q;
    for (int i = 1; i <= n; i++) 
        cin >> l[i] >> r[i];
    
    iota(w + 1, w + 1 + n, 1);
    sort(w + 1, w + 1 + n, [&](auto i, auto j) {
        if (r[i] == r[j])
            return l[i] < l[j];
        return r[i] < r[j];
    });

    for (int i = 0; i < q; i++) {
        int s, e; cin >> s >> e;
        if (s != e) {
            if (r[s] <= r[e])
                query[e].push_back({s, i});
            else
                ans[i] = 1e9;
        }
    }
    vector<int> v;
    for (int i = 1; i <= n; i++) {
        while (!v.empty() && l[v.back()] >= l[w[i]])
            v.pop_back();
        v.push_back(w[i]);

        int L = 0, R = (int)v.size() - 1;
        while (L < R) {
            int M = (L + R) / 2;
            if (r[v[M]] < l[w[i]])
                L = M + 1;
            else
                R = M;
        }
        go[0][w[i]] = v[L];
        for (int j = 1; j < 20; j++)
            go[j][w[i]] = go[j - 1][go[j - 1][w[i]]];

        for (auto [s, t] : query[w[i]]) {
            int x = w[i];
            for (int j = 19; j >= 0; j--) {
                if (r[s] < l[go[j][x]]) {
                    x = go[j][x];
                    ans[t] += (1 << j);
                }
            }
            ans[t] += (r[s] < l[x]) ? 2 : 1;
        }
    }
    for (int i = 0; i < q; i++) {
        if (ans[i] > n)
            cout << "impossible\n";
        else
            cout << ans[i] << '\n';
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2772 KB Output is correct
2 Correct 88 ms 14540 KB Output is correct
3 Correct 91 ms 14440 KB Output is correct
4 Correct 121 ms 14976 KB Output is correct
5 Correct 90 ms 14484 KB Output is correct
6 Correct 101 ms 14456 KB Output is correct
7 Correct 92 ms 14496 KB Output is correct
8 Correct 76 ms 15012 KB Output is correct
9 Correct 75 ms 17936 KB Output is correct
10 Correct 112 ms 17772 KB Output is correct
11 Correct 105 ms 17696 KB Output is correct
12 Correct 49 ms 16776 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2700 KB Output is correct
2 Correct 2 ms 2772 KB Output is correct
3 Correct 2 ms 2844 KB Output is correct
4 Correct 2 ms 2868 KB Output is correct
5 Correct 2 ms 2900 KB Output is correct
6 Correct 2 ms 2900 KB Output is correct
7 Correct 2 ms 2900 KB Output is correct
8 Correct 2 ms 2900 KB Output is correct
9 Correct 2 ms 2900 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2700 KB Output is correct
2 Correct 2 ms 2772 KB Output is correct
3 Correct 2 ms 2844 KB Output is correct
4 Correct 2 ms 2868 KB Output is correct
5 Correct 2 ms 2900 KB Output is correct
6 Correct 2 ms 2900 KB Output is correct
7 Correct 2 ms 2900 KB Output is correct
8 Correct 2 ms 2900 KB Output is correct
9 Correct 2 ms 2900 KB Output is correct
10 Correct 1 ms 2772 KB Output is correct
11 Correct 2 ms 2772 KB Output is correct
12 Correct 2 ms 2900 KB Output is correct
13 Correct 2 ms 2900 KB Output is correct
14 Correct 2 ms 2900 KB Output is correct
15 Correct 3 ms 2900 KB Output is correct
16 Correct 2 ms 2900 KB Output is correct
17 Correct 2 ms 2844 KB Output is correct
18 Correct 2 ms 2900 KB Output is correct
19 Correct 33 ms 6256 KB Output is correct
20 Correct 29 ms 6252 KB Output is correct
21 Correct 31 ms 6088 KB Output is correct
22 Correct 25 ms 6040 KB Output is correct
23 Correct 26 ms 5972 KB Output is correct
24 Correct 27 ms 6036 KB Output is correct
25 Correct 28 ms 6040 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2700 KB Output is correct
2 Correct 2 ms 2772 KB Output is correct
3 Correct 2 ms 2844 KB Output is correct
4 Correct 2 ms 2868 KB Output is correct
5 Correct 2 ms 2900 KB Output is correct
6 Correct 2 ms 2900 KB Output is correct
7 Correct 2 ms 2900 KB Output is correct
8 Correct 2 ms 2900 KB Output is correct
9 Correct 2 ms 2900 KB Output is correct
10 Correct 2 ms 2688 KB Output is correct
11 Correct 1 ms 2772 KB Output is correct
12 Correct 2 ms 2900 KB Output is correct
13 Correct 2 ms 2900 KB Output is correct
14 Correct 2 ms 2900 KB Output is correct
15 Correct 2 ms 2900 KB Output is correct
16 Correct 2 ms 2864 KB Output is correct
17 Correct 3 ms 2900 KB Output is correct
18 Correct 2 ms 2900 KB Output is correct
19 Correct 66 ms 14364 KB Output is correct
20 Correct 65 ms 13472 KB Output is correct
21 Correct 49 ms 13516 KB Output is correct
22 Correct 65 ms 14056 KB Output is correct
23 Correct 53 ms 14248 KB Output is correct
24 Correct 64 ms 14360 KB Output is correct
25 Correct 26 ms 12940 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 92 ms 14496 KB Output is correct
2 Correct 94 ms 14424 KB Output is correct
3 Correct 110 ms 14864 KB Output is correct
4 Correct 74 ms 15000 KB Output is correct
5 Correct 104 ms 14920 KB Output is correct
6 Correct 102 ms 14656 KB Output is correct
7 Correct 107 ms 14632 KB Output is correct
8 Correct 89 ms 14720 KB Output is correct
9 Correct 55 ms 12568 KB Output is correct
10 Correct 83 ms 14276 KB Output is correct
11 Correct 78 ms 14112 KB Output is correct
12 Correct 84 ms 14240 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2772 KB Output is correct
2 Correct 88 ms 14540 KB Output is correct
3 Correct 91 ms 14440 KB Output is correct
4 Correct 121 ms 14976 KB Output is correct
5 Correct 90 ms 14484 KB Output is correct
6 Correct 101 ms 14456 KB Output is correct
7 Correct 92 ms 14496 KB Output is correct
8 Correct 76 ms 15012 KB Output is correct
9 Correct 75 ms 17936 KB Output is correct
10 Correct 112 ms 17772 KB Output is correct
11 Correct 105 ms 17696 KB Output is correct
12 Correct 49 ms 16776 KB Output is correct
13 Correct 2 ms 2700 KB Output is correct
14 Correct 2 ms 2772 KB Output is correct
15 Correct 2 ms 2844 KB Output is correct
16 Correct 2 ms 2868 KB Output is correct
17 Correct 2 ms 2900 KB Output is correct
18 Correct 2 ms 2900 KB Output is correct
19 Correct 2 ms 2900 KB Output is correct
20 Correct 2 ms 2900 KB Output is correct
21 Correct 2 ms 2900 KB Output is correct
22 Correct 1 ms 2772 KB Output is correct
23 Correct 2 ms 2772 KB Output is correct
24 Correct 2 ms 2900 KB Output is correct
25 Correct 2 ms 2900 KB Output is correct
26 Correct 2 ms 2900 KB Output is correct
27 Correct 3 ms 2900 KB Output is correct
28 Correct 2 ms 2900 KB Output is correct
29 Correct 2 ms 2844 KB Output is correct
30 Correct 2 ms 2900 KB Output is correct
31 Correct 33 ms 6256 KB Output is correct
32 Correct 29 ms 6252 KB Output is correct
33 Correct 31 ms 6088 KB Output is correct
34 Correct 25 ms 6040 KB Output is correct
35 Correct 26 ms 5972 KB Output is correct
36 Correct 27 ms 6036 KB Output is correct
37 Correct 28 ms 6040 KB Output is correct
38 Correct 2 ms 2688 KB Output is correct
39 Correct 1 ms 2772 KB Output is correct
40 Correct 2 ms 2900 KB Output is correct
41 Correct 2 ms 2900 KB Output is correct
42 Correct 2 ms 2900 KB Output is correct
43 Correct 2 ms 2900 KB Output is correct
44 Correct 2 ms 2864 KB Output is correct
45 Correct 3 ms 2900 KB Output is correct
46 Correct 2 ms 2900 KB Output is correct
47 Correct 66 ms 14364 KB Output is correct
48 Correct 65 ms 13472 KB Output is correct
49 Correct 49 ms 13516 KB Output is correct
50 Correct 65 ms 14056 KB Output is correct
51 Correct 53 ms 14248 KB Output is correct
52 Correct 64 ms 14360 KB Output is correct
53 Correct 26 ms 12940 KB Output is correct
54 Correct 92 ms 14496 KB Output is correct
55 Correct 94 ms 14424 KB Output is correct
56 Correct 110 ms 14864 KB Output is correct
57 Correct 74 ms 15000 KB Output is correct
58 Correct 104 ms 14920 KB Output is correct
59 Correct 102 ms 14656 KB Output is correct
60 Correct 107 ms 14632 KB Output is correct
61 Correct 89 ms 14720 KB Output is correct
62 Correct 55 ms 12568 KB Output is correct
63 Correct 83 ms 14276 KB Output is correct
64 Correct 78 ms 14112 KB Output is correct
65 Correct 84 ms 14240 KB Output is correct
66 Correct 1 ms 2772 KB Output is correct
67 Correct 90 ms 17556 KB Output is correct
68 Correct 92 ms 17476 KB Output is correct
69 Correct 137 ms 17872 KB Output is correct
70 Correct 90 ms 17524 KB Output is correct
71 Correct 88 ms 17484 KB Output is correct
72 Correct 90 ms 17472 KB Output is correct
73 Correct 73 ms 17940 KB Output is correct
74 Correct 80 ms 17972 KB Output is correct
75 Correct 111 ms 17856 KB Output is correct
76 Correct 98 ms 17700 KB Output is correct
77 Correct 49 ms 16840 KB Output is correct
78 Correct 2 ms 2772 KB Output is correct
79 Correct 2 ms 2900 KB Output is correct
80 Correct 2 ms 2848 KB Output is correct
81 Correct 2 ms 2840 KB Output is correct
82 Correct 2 ms 2844 KB Output is correct
83 Correct 2 ms 2900 KB Output is correct
84 Correct 2 ms 2840 KB Output is correct
85 Correct 2 ms 2900 KB Output is correct
86 Correct 30 ms 6152 KB Output is correct
87 Correct 29 ms 6292 KB Output is correct
88 Correct 31 ms 6016 KB Output is correct
89 Correct 24 ms 6016 KB Output is correct
90 Correct 26 ms 5868 KB Output is correct
91 Correct 25 ms 5972 KB Output is correct
92 Correct 26 ms 6080 KB Output is correct
93 Correct 64 ms 14312 KB Output is correct
94 Correct 59 ms 13508 KB Output is correct
95 Correct 47 ms 13516 KB Output is correct
96 Correct 63 ms 14016 KB Output is correct
97 Correct 55 ms 14304 KB Output is correct
98 Correct 59 ms 14308 KB Output is correct
99 Correct 26 ms 13048 KB Output is correct
100 Correct 104 ms 17624 KB Output is correct
101 Correct 100 ms 17596 KB Output is correct
102 Correct 92 ms 17776 KB Output is correct
103 Correct 84 ms 17280 KB Output is correct
104 Correct 75 ms 17128 KB Output is correct
105 Correct 88 ms 17224 KB Output is correct
106 Correct 115 ms 16816 KB Output is correct
107 Correct 132 ms 16884 KB Output is correct
108 Correct 85 ms 17100 KB Output is correct
109 Correct 91 ms 17064 KB Output is correct
110 Correct 85 ms 17028 KB Output is correct
111 Correct 84 ms 17012 KB Output is correct