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Submission #698104

# Submission time Handle Problem Language Result Execution time Memory
698104 2023-02-12T10:47:45 Z Duy_e Event Hopping (BOI22_events) C++14
100 / 100
 140 ms 28104 KB 
#include <bits/stdc++.h>
#define pii pair <int, int>
#define st first
#define nd second
#define e second
#define s first
#define rep(i, n, m) for (int i = (n); i <= (m); i ++)
#define rrep(i, n, m) for (int i = (n); i >= (m); i --)
using namespace std;
const long long N = 2e5 + 5;
int n, q, sp[20][N], nxt[20][N];
pii a[N];

vector <int> cmp;

int mini(int i, int j) {
    if (i == 0) return j;
    if (j == 0) return i;
    if (a[i].st < a[j].st) return i;
    return j;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> q;
    rep(i, 1, n) {
        cin >> a[i].st >> a[i].nd;
        cmp.push_back(a[i].st);
        cmp.push_back(a[i].nd);
    }

    sort(cmp.begin(), cmp.end());
    cmp.resize(unique(cmp.begin(), cmp.end()) - cmp.begin());

    auto find = [&] (int x) {
        return lower_bound(cmp.begin(), cmp.end(), x) - cmp.begin() + 1;
    };

    rep(i, 1, n) {
        a[i].st = find(a[i].st);
        a[i].nd = find(a[i].nd);

        if (sp[0][a[i].nd] == 0)
            sp[0][a[i].nd] = i;
        else
            sp[0][a[i].nd] = mini(sp[0][a[i].nd], i);
    }

    rep(i, 1, 19) rep(j, 1, 2 * n)
        if (j + (1 << (i - 1)) <= 2 * n)
            sp[i][j] = mini(sp[i - 1][j], sp[i - 1][j + (1 << (i - 1))]);

    auto get = [&] (int l, int r) {
        int k = log2(r - l + 1);
        return mini(sp[k][l], sp[k][r - (1 << k) + 1]);
    };

    rep(i, 1, n) {
        int u = get(a[i].st, a[i].nd);
        nxt[0][i] = u;
//        cout << i << ' ' << u << '\n';
    }

    rep(i, 1, 19) rep(j, 1, n)
        nxt[i][j] = nxt[i - 1][nxt[i - 1][j]];

    while (q --) {
        int u, v;
        cin >> u >> v;

        if (u == v) {
            cout << 0 << '\n';
            continue;
        }

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

        int ans = 0;
        rrep(i, 19, 0) {
            int x = nxt[i][v];
            if (a[u].e < a[x].s) {
                ans += 1 << i;
                v = x;
            }
        }

        if (a[v].s <= a[u].e && a[u].e <= a[v].e) ans ++;
        else v = nxt[0][v], ans += 2;
        if (a[v].s <= a[u].e && a[u].e <= a[v].e)
            cout << ans << '\n';
        else
            cout << "impossible\n";
    }

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 97 ms 27060 KB Output is correct
3 Correct 108 ms 27076 KB Output is correct
4 Correct 140 ms 27076 KB Output is correct
5 Correct 117 ms 27152 KB Output is correct
6 Correct 118 ms 27340 KB Output is correct
7 Correct 117 ms 27328 KB Output is correct
8 Correct 129 ms 27972 KB Output is correct
9 Correct 126 ms 28008 KB Output is correct
10 Correct 113 ms 27472 KB Output is correct
11 Correct 118 ms 27664 KB Output is correct
12 Correct 66 ms 27004 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 600 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 596 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 2 ms 600 KB Output is correct
9 Correct 1 ms 596 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 600 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 596 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 2 ms 600 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 0 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 596 KB Output is correct
13 Correct 1 ms 600 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 2 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 31 ms 2992 KB Output is correct
20 Correct 32 ms 3068 KB Output is correct
21 Correct 31 ms 3216 KB Output is correct
22 Correct 26 ms 3284 KB Output is correct
23 Correct 27 ms 3204 KB Output is correct
24 Correct 24 ms 3116 KB Output is correct
25 Correct 27 ms 2812 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 600 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 596 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 2 ms 600 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 596 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 70 ms 25344 KB Output is correct
20 Correct 70 ms 24556 KB Output is correct
21 Correct 71 ms 25252 KB Output is correct
22 Correct 76 ms 25516 KB Output is correct
23 Correct 74 ms 25284 KB Output is correct
24 Correct 75 ms 25720 KB Output is correct
25 Correct 33 ms 24276 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 95 ms 27076 KB Output is correct
2 Correct 108 ms 27092 KB Output is correct
3 Correct 135 ms 27028 KB Output is correct
4 Correct 125 ms 28104 KB Output is correct
5 Correct 116 ms 27484 KB Output is correct
6 Correct 121 ms 27664 KB Output is correct
7 Correct 117 ms 27588 KB Output is correct
8 Correct 111 ms 27764 KB Output is correct
9 Correct 74 ms 25252 KB Output is correct
10 Correct 110 ms 27224 KB Output is correct
11 Correct 108 ms 26936 KB Output is correct
12 Correct 112 ms 27220 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 97 ms 27060 KB Output is correct
3 Correct 108 ms 27076 KB Output is correct
4 Correct 140 ms 27076 KB Output is correct
5 Correct 117 ms 27152 KB Output is correct
6 Correct 118 ms 27340 KB Output is correct
7 Correct 117 ms 27328 KB Output is correct
8 Correct 129 ms 27972 KB Output is correct
9 Correct 126 ms 28008 KB Output is correct
10 Correct 113 ms 27472 KB Output is correct
11 Correct 118 ms 27664 KB Output is correct
12 Correct 66 ms 27004 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 0 ms 468 KB Output is correct
15 Correct 1 ms 600 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 1 ms 596 KB Output is correct
20 Correct 2 ms 600 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 0 ms 468 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 596 KB Output is correct
25 Correct 1 ms 600 KB Output is correct
26 Correct 1 ms 596 KB Output is correct
27 Correct 1 ms 596 KB Output is correct
28 Correct 2 ms 596 KB Output is correct
29 Correct 1 ms 596 KB Output is correct
30 Correct 1 ms 596 KB Output is correct
31 Correct 31 ms 2992 KB Output is correct
32 Correct 32 ms 3068 KB Output is correct
33 Correct 31 ms 3216 KB Output is correct
34 Correct 26 ms 3284 KB Output is correct
35 Correct 27 ms 3204 KB Output is correct
36 Correct 24 ms 3116 KB Output is correct
37 Correct 27 ms 2812 KB Output is correct
38 Correct 1 ms 468 KB Output is correct
39 Correct 1 ms 468 KB Output is correct
40 Correct 1 ms 596 KB Output is correct
41 Correct 1 ms 596 KB Output is correct
42 Correct 1 ms 596 KB Output is correct
43 Correct 1 ms 596 KB Output is correct
44 Correct 1 ms 596 KB Output is correct
45 Correct 1 ms 596 KB Output is correct
46 Correct 1 ms 596 KB Output is correct
47 Correct 70 ms 25344 KB Output is correct
48 Correct 70 ms 24556 KB Output is correct
49 Correct 71 ms 25252 KB Output is correct
50 Correct 76 ms 25516 KB Output is correct
51 Correct 74 ms 25284 KB Output is correct
52 Correct 75 ms 25720 KB Output is correct
53 Correct 33 ms 24276 KB Output is correct
54 Correct 95 ms 27076 KB Output is correct
55 Correct 108 ms 27092 KB Output is correct
56 Correct 135 ms 27028 KB Output is correct
57 Correct 125 ms 28104 KB Output is correct
58 Correct 116 ms 27484 KB Output is correct
59 Correct 121 ms 27664 KB Output is correct
60 Correct 117 ms 27588 KB Output is correct
61 Correct 111 ms 27764 KB Output is correct
62 Correct 74 ms 25252 KB Output is correct
63 Correct 110 ms 27224 KB Output is correct
64 Correct 108 ms 26936 KB Output is correct
65 Correct 112 ms 27220 KB Output is correct
66 Correct 0 ms 456 KB Output is correct
67 Correct 95 ms 27056 KB Output is correct
68 Correct 110 ms 27112 KB Output is correct
69 Correct 135 ms 27060 KB Output is correct
70 Correct 116 ms 27204 KB Output is correct
71 Correct 111 ms 27208 KB Output is correct
72 Correct 116 ms 27328 KB Output is correct
73 Correct 123 ms 28008 KB Output is correct
74 Correct 131 ms 28012 KB Output is correct
75 Correct 115 ms 27420 KB Output is correct
76 Correct 126 ms 27608 KB Output is correct
77 Correct 65 ms 26884 KB Output is correct
78 Correct 1 ms 468 KB Output is correct
79 Correct 2 ms 596 KB Output is correct
80 Correct 1 ms 596 KB Output is correct
81 Correct 1 ms 596 KB Output is correct
82 Correct 1 ms 596 KB Output is correct
83 Correct 1 ms 596 KB Output is correct
84 Correct 1 ms 724 KB Output is correct
85 Correct 1 ms 596 KB Output is correct
86 Correct 31 ms 3024 KB Output is correct
87 Correct 30 ms 3008 KB Output is correct
88 Correct 31 ms 3244 KB Output is correct
89 Correct 26 ms 3348 KB Output is correct
90 Correct 25 ms 3148 KB Output is correct
91 Correct 25 ms 3160 KB Output is correct
92 Correct 27 ms 2892 KB Output is correct
93 Correct 71 ms 25276 KB Output is correct
94 Correct 73 ms 24512 KB Output is correct
95 Correct 73 ms 25220 KB Output is correct
96 Correct 78 ms 25472 KB Output is correct
97 Correct 75 ms 25244 KB Output is correct
98 Correct 74 ms 25708 KB Output is correct
99 Correct 33 ms 24252 KB Output is correct
100 Correct 135 ms 27620 KB Output is correct
101 Correct 117 ms 27572 KB Output is correct
102 Correct 108 ms 27720 KB Output is correct
103 Correct 109 ms 27284 KB Output is correct
104 Correct 118 ms 27044 KB Output is correct
105 Correct 110 ms 27244 KB Output is correct
106 Correct 111 ms 26440 KB Output is correct
107 Correct 122 ms 26476 KB Output is correct
108 Correct 108 ms 27288 KB Output is correct
109 Correct 106 ms 27148 KB Output is correct
110 Correct 111 ms 27464 KB Output is correct
111 Correct 105 ms 27492 KB Output is correct