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Submission #1103111

# Submission time Handle Problem Language Result Execution time Memory
1103111 2024-10-20T06:20:47 Z MateiKing80 Event Hopping (BOI22_events) C++14
100 / 100
 124 ms 22348 KB 
#include <bits/stdc++.h>

using namespace std;

#define pii pair<int, int>
#define fr first
#define sc second

const int B = 17;
int n;

struct Rmq
{
    int rmq[B][100005];
    void build(int arr[])
    {
        for(int i = 1; i <= n; i ++)
            rmq[0][i] = arr[i];
        for(int p = 0; p + 1 < B; p ++)
            for(int i = 1; i <= n - (1 << p); i ++)
                rmq[p + 1][i] = min(rmq[p][i], rmq[p][i + (1 << p)]);
    }
    int query(int l, int r)
    {
        int p = __lg(r - l + 1);
        return min(rmq[p][l], rmq[p][r - (1 << p) + 1]);
    }
} ds;

int q, rk[100005], ord[100005], lift[20][100005], lst[100005], ans[100005], start[100005];
pii p[100005], rng[100005];

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);

    cin >> n >> q;
    for(int i = 1; i <= n; i ++)
        cin >> p[i].fr >> p[i].sc;
    for(int i = 1; i <= n; i ++)
        rk[i] = i;
    sort(rk + 1, rk + 1 + n, [&](int i, int j)
    {
        return p[i].sc < p[j].sc;
    });
    for(int i = 1; i <= n; i ++)
        ord[rk[i]] = i;
    sort(p + 1, p + 1 + n, [&](pii i, pii j)
    {
        return i.sc < j.sc;
    });

    for(int i = 1; i <= n; i ++)
        lift[0][i] = lower_bound(p + 1, p + 1 + n, pii(0, p[i].fr), [](pii i, pii j)
                                                                    {
                                                                        return i.sc < j.sc;
                                                                    }) - p;
    for(int i = 1; i <= n; i ++)
        lst[i] = upper_bound(p + 1, p + 1 + n, pii(0, p[i].sc), [](pii i, pii j)
                                                                {
                                                                    return i.sc < j.sc;
                                                                }) - p - 1;
    for(int p = 0; p + 1 < B; p ++)
    {
        ds.build(lift[p]);
        for(int i = 1; i <= n; i ++)
            lift[p + 1][i] = ds.query(lift[p][i], lst[i]);
    }

    for(int i = 1; i <= q; i ++)
    {
        int u, v;
        cin >> u >> v;
        if(u == v)
            ans[i] = -1;
        start[i] = ord[u];
        rng[i] = pii(ord[v], ord[v]);
    }
    for(int p = B - 1; p >= 0; p --)
    {
        ds.build(lift[p]);
        for(int i = 1; i <= q; i ++)
        {
            pii nrange = pii(ds.query(rng[i].fr, rng[i].sc), lst[rng[i].sc]);
            if(start[i] < nrange.fr || nrange.sc < start[i])
            {
                ans[i] += (1 << p);
                rng[i] = nrange;
            }
        }
    }
    for(int i = 1; i <= q; i ++)
        if(ans[i] >= n)
            cout << "impossible\n";
        else
            cout << ans[i] + 1 << '\n';
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 14676 KB Output is correct
2 Correct 104 ms 21960 KB Output is correct
3 Correct 101 ms 21836 KB Output is correct
4 Correct 112 ms 21836 KB Output is correct
5 Correct 104 ms 21836 KB Output is correct
6 Correct 102 ms 21832 KB Output is correct
7 Correct 104 ms 21964 KB Output is correct
8 Correct 101 ms 22344 KB Output is correct
9 Correct 101 ms 22348 KB Output is correct
10 Correct 114 ms 22092 KB Output is correct
11 Correct 114 ms 21328 KB Output is correct
12 Correct 88 ms 20556 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10580 KB Output is correct
2 Correct 2 ms 10580 KB Output is correct
3 Correct 2 ms 10836 KB Output is correct
4 Correct 3 ms 10836 KB Output is correct
5 Correct 2 ms 10836 KB Output is correct
6 Correct 2 ms 10836 KB Output is correct
7 Correct 2 ms 10836 KB Output is correct
8 Correct 2 ms 10836 KB Output is correct
9 Correct 2 ms 10932 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10580 KB Output is correct
2 Correct 2 ms 10580 KB Output is correct
3 Correct 2 ms 10836 KB Output is correct
4 Correct 3 ms 10836 KB Output is correct
5 Correct 2 ms 10836 KB Output is correct
6 Correct 2 ms 10836 KB Output is correct
7 Correct 2 ms 10836 KB Output is correct
8 Correct 2 ms 10836 KB Output is correct
9 Correct 2 ms 10932 KB Output is correct
10 Correct 2 ms 10580 KB Output is correct
11 Correct 1 ms 10580 KB Output is correct
12 Correct 2 ms 10836 KB Output is correct
13 Correct 2 ms 10836 KB Output is correct
14 Correct 2 ms 10836 KB Output is correct
15 Correct 3 ms 16888 KB Output is correct
16 Correct 2 ms 10836 KB Output is correct
17 Correct 3 ms 11092 KB Output is correct
18 Correct 2 ms 10836 KB Output is correct
19 Correct 24 ms 12668 KB Output is correct
20 Correct 25 ms 12620 KB Output is correct
21 Correct 35 ms 14676 KB Output is correct
22 Correct 34 ms 18708 KB Output is correct
23 Correct 32 ms 18508 KB Output is correct
24 Correct 32 ms 18596 KB Output is correct
25 Correct 24 ms 18252 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10580 KB Output is correct
2 Correct 2 ms 10580 KB Output is correct
3 Correct 2 ms 10836 KB Output is correct
4 Correct 3 ms 10836 KB Output is correct
5 Correct 2 ms 10836 KB Output is correct
6 Correct 2 ms 10836 KB Output is correct
7 Correct 2 ms 10836 KB Output is correct
8 Correct 2 ms 10836 KB Output is correct
9 Correct 2 ms 10932 KB Output is correct
10 Correct 2 ms 14676 KB Output is correct
11 Correct 1 ms 10580 KB Output is correct
12 Correct 2 ms 10836 KB Output is correct
13 Correct 2 ms 10836 KB Output is correct
14 Correct 2 ms 10836 KB Output is correct
15 Correct 2 ms 10836 KB Output is correct
16 Correct 2 ms 10848 KB Output is correct
17 Correct 2 ms 10836 KB Output is correct
18 Correct 2 ms 10836 KB Output is correct
19 Correct 77 ms 18764 KB Output is correct
20 Correct 74 ms 19036 KB Output is correct
21 Correct 83 ms 18764 KB Output is correct
22 Correct 77 ms 18776 KB Output is correct
23 Correct 74 ms 19912 KB Output is correct
24 Correct 76 ms 19788 KB Output is correct
25 Correct 65 ms 19276 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 101 ms 20808 KB Output is correct
2 Correct 113 ms 20812 KB Output is correct
3 Correct 111 ms 20812 KB Output is correct
4 Correct 110 ms 21336 KB Output is correct
5 Correct 123 ms 21068 KB Output is correct
6 Correct 122 ms 21836 KB Output is correct
7 Correct 116 ms 21976 KB Output is correct
8 Correct 114 ms 22092 KB Output is correct
9 Correct 74 ms 19820 KB Output is correct
10 Correct 101 ms 21584 KB Output is correct
11 Correct 99 ms 21324 KB Output is correct
12 Correct 109 ms 21592 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 14676 KB Output is correct
2 Correct 104 ms 21960 KB Output is correct
3 Correct 101 ms 21836 KB Output is correct
4 Correct 112 ms 21836 KB Output is correct
5 Correct 104 ms 21836 KB Output is correct
6 Correct 102 ms 21832 KB Output is correct
7 Correct 104 ms 21964 KB Output is correct
8 Correct 101 ms 22344 KB Output is correct
9 Correct 101 ms 22348 KB Output is correct
10 Correct 114 ms 22092 KB Output is correct
11 Correct 114 ms 21328 KB Output is correct
12 Correct 88 ms 20556 KB Output is correct
13 Correct 2 ms 10580 KB Output is correct
14 Correct 2 ms 10580 KB Output is correct
15 Correct 2 ms 10836 KB Output is correct
16 Correct 3 ms 10836 KB Output is correct
17 Correct 2 ms 10836 KB Output is correct
18 Correct 2 ms 10836 KB Output is correct
19 Correct 2 ms 10836 KB Output is correct
20 Correct 2 ms 10836 KB Output is correct
21 Correct 2 ms 10932 KB Output is correct
22 Correct 2 ms 10580 KB Output is correct
23 Correct 1 ms 10580 KB Output is correct
24 Correct 2 ms 10836 KB Output is correct
25 Correct 2 ms 10836 KB Output is correct
26 Correct 2 ms 10836 KB Output is correct
27 Correct 3 ms 16888 KB Output is correct
28 Correct 2 ms 10836 KB Output is correct
29 Correct 3 ms 11092 KB Output is correct
30 Correct 2 ms 10836 KB Output is correct
31 Correct 24 ms 12668 KB Output is correct
32 Correct 25 ms 12620 KB Output is correct
33 Correct 35 ms 14676 KB Output is correct
34 Correct 34 ms 18708 KB Output is correct
35 Correct 32 ms 18508 KB Output is correct
36 Correct 32 ms 18596 KB Output is correct
37 Correct 24 ms 18252 KB Output is correct
38 Correct 2 ms 14676 KB Output is correct
39 Correct 1 ms 10580 KB Output is correct
40 Correct 2 ms 10836 KB Output is correct
41 Correct 2 ms 10836 KB Output is correct
42 Correct 2 ms 10836 KB Output is correct
43 Correct 2 ms 10836 KB Output is correct
44 Correct 2 ms 10848 KB Output is correct
45 Correct 2 ms 10836 KB Output is correct
46 Correct 2 ms 10836 KB Output is correct
47 Correct 77 ms 18764 KB Output is correct
48 Correct 74 ms 19036 KB Output is correct
49 Correct 83 ms 18764 KB Output is correct
50 Correct 77 ms 18776 KB Output is correct
51 Correct 74 ms 19912 KB Output is correct
52 Correct 76 ms 19788 KB Output is correct
53 Correct 65 ms 19276 KB Output is correct
54 Correct 101 ms 20808 KB Output is correct
55 Correct 113 ms 20812 KB Output is correct
56 Correct 111 ms 20812 KB Output is correct
57 Correct 110 ms 21336 KB Output is correct
58 Correct 123 ms 21068 KB Output is correct
59 Correct 122 ms 21836 KB Output is correct
60 Correct 116 ms 21976 KB Output is correct
61 Correct 114 ms 22092 KB Output is correct
62 Correct 74 ms 19820 KB Output is correct
63 Correct 101 ms 21584 KB Output is correct
64 Correct 99 ms 21324 KB Output is correct
65 Correct 109 ms 21592 KB Output is correct
66 Correct 2 ms 14676 KB Output is correct
67 Correct 102 ms 21752 KB Output is correct
68 Correct 107 ms 21700 KB Output is correct
69 Correct 117 ms 21836 KB Output is correct
70 Correct 102 ms 21840 KB Output is correct
71 Correct 108 ms 21836 KB Output is correct
72 Correct 103 ms 21836 KB Output is correct
73 Correct 100 ms 22348 KB Output is correct
74 Correct 102 ms 22236 KB Output is correct
75 Correct 115 ms 22092 KB Output is correct
76 Correct 117 ms 21324 KB Output is correct
77 Correct 86 ms 20560 KB Output is correct
78 Correct 2 ms 10744 KB Output is correct
79 Correct 2 ms 10732 KB Output is correct
80 Correct 3 ms 16724 KB Output is correct
81 Correct 3 ms 16724 KB Output is correct
82 Correct 3 ms 16724 KB Output is correct
83 Correct 3 ms 16724 KB Output is correct
84 Correct 3 ms 11000 KB Output is correct
85 Correct 2 ms 10836 KB Output is correct
86 Correct 28 ms 18380 KB Output is correct
87 Correct 28 ms 14412 KB Output is correct
88 Correct 43 ms 12972 KB Output is correct
89 Correct 37 ms 18848 KB Output is correct
90 Correct 35 ms 18604 KB Output is correct
91 Correct 36 ms 18508 KB Output is correct
92 Correct 28 ms 12340 KB Output is correct
93 Correct 81 ms 19788 KB Output is correct
94 Correct 76 ms 19212 KB Output is correct
95 Correct 80 ms 19788 KB Output is correct
96 Correct 83 ms 19788 KB Output is correct
97 Correct 77 ms 19792 KB Output is correct
98 Correct 79 ms 19804 KB Output is correct
99 Correct 63 ms 19284 KB Output is correct
100 Correct 124 ms 21836 KB Output is correct
101 Correct 113 ms 21848 KB Output is correct
102 Correct 118 ms 22092 KB Output is correct
103 Correct 102 ms 21580 KB Output is correct
104 Correct 102 ms 21324 KB Output is correct
105 Correct 106 ms 21580 KB Output is correct
106 Correct 108 ms 21196 KB Output is correct
107 Correct 108 ms 21332 KB Output is correct
108 Correct 111 ms 21944 KB Output is correct
109 Correct 118 ms 21836 KB Output is correct
110 Correct 110 ms 21840 KB Output is correct
111 Correct 118 ms 21836 KB Output is correct