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Submission #625242

# Submission time Handle Problem Language Result Execution time Memory
625242 2022-08-09T16:56:17 Z Ooops_sorry Event Hopping (BOI22_events) C++14
100 / 100
 356 ms 20352 KB 
#include<bits/stdc++.h>

using namespace std;

#define pb push_back
#define ld double
#define ll long long

mt19937 rnd(51);

const int N = 2e5 + 10, INF = 1e9;
int po[20][N];
pair<int,int> t[4 * N];

void update(int v, int l, int r, int pos, pair<int,int> val) {
    if (l == r) {
        t[v] = min(t[v], val);
        return;
    }
    int m = (l + r) / 2;
    if (pos <= m) {
        update(2 * v, l, m, pos, val);
    } else {
        update(2 * v + 1, m + 1, r, pos, val);
    }
    t[v] = min(t[v * 2], t[v * 2 + 1]);
}

pair<int,int> get(int v, int tl, int tr, int l, int r) {
    if (l > r) return {INF, INF};
    if (tl == l && tr == r) {
        return t[v];
    }
    int tm = (tl + tr) / 2;
    return min(get(2 * v, tl, tm, l, min(r, tm)), get(2 * v + 1, tm + 1, tr, max(l, tm + 1), r));
}

signed main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
#endif // LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    for (int i = 0; i < 4 * N; i++) {
        t[i] = {INF, INF};
    }
    int n, q;
    cin >> n >> q;
    vector<int> s(n), e(n), u;
    for (int i = 0; i < n; i++) {
        cin >> s[i] >> e[i];
        u.pb(s[i]);
        u.pb(e[i]);
    }
    sort(u.begin(), u.end());
    u.erase(unique(u.begin(), u.end()), u.end());
    int sz = u.size();
    for (int i = 0; i < n; i++) {
        s[i] = lower_bound(u.begin(), u.end(), s[i]) - u.begin();
        e[i] = lower_bound(u.begin(), u.end(), e[i]) - u.begin();
        update(1, 0, sz - 1, e[i], {s[i], i});
    }
    for (int i = 0; i < n; i++) {
        po[0][i] = get(1, 0, sz - 1, s[i], e[i]).second;
    }
    for (int i = 1; i < 20; i++) {
        for (int j = 0; j < n; j++) {
            po[i][j] = po[i - 1][po[i - 1][j]];
        }
    }
    for (int i = 0; i < q; i++) {
        int a, b;
        cin >> a >> b;
        a--, b--;
        if (a == b) {
            cout << 0 << endl;
        } else if (e[a] > e[b]) {
            cout << "impossible" << endl;
        } else {
            if (s[b] <= e[a] && e[a] <= e[b]) {
                cout << 1 << endl;
                continue;
            }
            int cnt = 2;
            for (int j = 19; j >= 0; j--) {
                if (e[a] < s[po[j][b]]) {
                    b = po[j][b];
                    cnt += (1 << j);
                }
            }
            b = po[0][b];
            if (e[a] < s[b]) {
                cout << "impossible" << endl;
            } else {
                cout << cnt << endl;
            }
        }
    }
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6612 KB Output is correct
2 Correct 278 ms 19900 KB Output is correct
3 Correct 307 ms 19872 KB Output is correct
4 Correct 320 ms 19920 KB Output is correct
5 Correct 297 ms 19924 KB Output is correct
6 Correct 313 ms 19944 KB Output is correct
7 Correct 288 ms 19900 KB Output is correct
8 Correct 321 ms 20304 KB Output is correct
9 Correct 292 ms 20352 KB Output is correct
10 Correct 299 ms 20260 KB Output is correct
11 Correct 309 ms 20276 KB Output is correct
12 Correct 250 ms 19608 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6596 KB Output is correct
2 Correct 4 ms 6584 KB Output is correct
3 Correct 4 ms 6740 KB Output is correct
4 Correct 4 ms 6756 KB Output is correct
5 Correct 4 ms 6740 KB Output is correct
6 Correct 4 ms 6740 KB Output is correct
7 Correct 5 ms 6740 KB Output is correct
8 Correct 5 ms 6740 KB Output is correct
9 Correct 4 ms 6740 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6596 KB Output is correct
2 Correct 4 ms 6584 KB Output is correct
3 Correct 4 ms 6740 KB Output is correct
4 Correct 4 ms 6756 KB Output is correct
5 Correct 4 ms 6740 KB Output is correct
6 Correct 4 ms 6740 KB Output is correct
7 Correct 5 ms 6740 KB Output is correct
8 Correct 5 ms 6740 KB Output is correct
9 Correct 4 ms 6740 KB Output is correct
10 Correct 4 ms 6612 KB Output is correct
11 Correct 3 ms 6612 KB Output is correct
12 Correct 4 ms 6740 KB Output is correct
13 Correct 6 ms 6740 KB Output is correct
14 Correct 6 ms 6740 KB Output is correct
15 Correct 7 ms 6740 KB Output is correct
16 Correct 5 ms 6740 KB Output is correct
17 Correct 5 ms 6740 KB Output is correct
18 Correct 4 ms 6732 KB Output is correct
19 Correct 172 ms 8696 KB Output is correct
20 Correct 158 ms 8708 KB Output is correct
21 Correct 167 ms 8916 KB Output is correct
22 Correct 191 ms 9028 KB Output is correct
23 Correct 174 ms 8900 KB Output is correct
24 Correct 158 ms 8900 KB Output is correct
25 Correct 150 ms 8484 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6596 KB Output is correct
2 Correct 4 ms 6584 KB Output is correct
3 Correct 4 ms 6740 KB Output is correct
4 Correct 4 ms 6756 KB Output is correct
5 Correct 4 ms 6740 KB Output is correct
6 Correct 4 ms 6740 KB Output is correct
7 Correct 5 ms 6740 KB Output is correct
8 Correct 5 ms 6740 KB Output is correct
9 Correct 4 ms 6740 KB Output is correct
10 Correct 3 ms 6612 KB Output is correct
11 Correct 4 ms 6592 KB Output is correct
12 Correct 5 ms 6728 KB Output is correct
13 Correct 4 ms 6740 KB Output is correct
14 Correct 4 ms 6728 KB Output is correct
15 Correct 5 ms 6740 KB Output is correct
16 Correct 5 ms 6728 KB Output is correct
17 Correct 4 ms 6732 KB Output is correct
18 Correct 4 ms 6740 KB Output is correct
19 Correct 108 ms 18116 KB Output is correct
20 Correct 106 ms 17244 KB Output is correct
21 Correct 115 ms 18020 KB Output is correct
22 Correct 134 ms 18052 KB Output is correct
23 Correct 130 ms 18068 KB Output is correct
24 Correct 137 ms 18044 KB Output is correct
25 Correct 31 ms 17472 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 259 ms 19932 KB Output is correct
2 Correct 267 ms 19796 KB Output is correct
3 Correct 304 ms 19700 KB Output is correct
4 Correct 307 ms 20060 KB Output is correct
5 Correct 316 ms 19980 KB Output is correct
6 Correct 300 ms 19988 KB Output is correct
7 Correct 355 ms 19784 KB Output is correct
8 Correct 299 ms 20080 KB Output is correct
9 Correct 132 ms 17968 KB Output is correct
10 Correct 334 ms 19532 KB Output is correct
11 Correct 300 ms 19380 KB Output is correct
12 Correct 329 ms 19624 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6612 KB Output is correct
2 Correct 278 ms 19900 KB Output is correct
3 Correct 307 ms 19872 KB Output is correct
4 Correct 320 ms 19920 KB Output is correct
5 Correct 297 ms 19924 KB Output is correct
6 Correct 313 ms 19944 KB Output is correct
7 Correct 288 ms 19900 KB Output is correct
8 Correct 321 ms 20304 KB Output is correct
9 Correct 292 ms 20352 KB Output is correct
10 Correct 299 ms 20260 KB Output is correct
11 Correct 309 ms 20276 KB Output is correct
12 Correct 250 ms 19608 KB Output is correct
13 Correct 4 ms 6596 KB Output is correct
14 Correct 4 ms 6584 KB Output is correct
15 Correct 4 ms 6740 KB Output is correct
16 Correct 4 ms 6756 KB Output is correct
17 Correct 4 ms 6740 KB Output is correct
18 Correct 4 ms 6740 KB Output is correct
19 Correct 5 ms 6740 KB Output is correct
20 Correct 5 ms 6740 KB Output is correct
21 Correct 4 ms 6740 KB Output is correct
22 Correct 4 ms 6612 KB Output is correct
23 Correct 3 ms 6612 KB Output is correct
24 Correct 4 ms 6740 KB Output is correct
25 Correct 6 ms 6740 KB Output is correct
26 Correct 6 ms 6740 KB Output is correct
27 Correct 7 ms 6740 KB Output is correct
28 Correct 5 ms 6740 KB Output is correct
29 Correct 5 ms 6740 KB Output is correct
30 Correct 4 ms 6732 KB Output is correct
31 Correct 172 ms 8696 KB Output is correct
32 Correct 158 ms 8708 KB Output is correct
33 Correct 167 ms 8916 KB Output is correct
34 Correct 191 ms 9028 KB Output is correct
35 Correct 174 ms 8900 KB Output is correct
36 Correct 158 ms 8900 KB Output is correct
37 Correct 150 ms 8484 KB Output is correct
38 Correct 3 ms 6612 KB Output is correct
39 Correct 4 ms 6592 KB Output is correct
40 Correct 5 ms 6728 KB Output is correct
41 Correct 4 ms 6740 KB Output is correct
42 Correct 4 ms 6728 KB Output is correct
43 Correct 5 ms 6740 KB Output is correct
44 Correct 5 ms 6728 KB Output is correct
45 Correct 4 ms 6732 KB Output is correct
46 Correct 4 ms 6740 KB Output is correct
47 Correct 108 ms 18116 KB Output is correct
48 Correct 106 ms 17244 KB Output is correct
49 Correct 115 ms 18020 KB Output is correct
50 Correct 134 ms 18052 KB Output is correct
51 Correct 130 ms 18068 KB Output is correct
52 Correct 137 ms 18044 KB Output is correct
53 Correct 31 ms 17472 KB Output is correct
54 Correct 259 ms 19932 KB Output is correct
55 Correct 267 ms 19796 KB Output is correct
56 Correct 304 ms 19700 KB Output is correct
57 Correct 307 ms 20060 KB Output is correct
58 Correct 316 ms 19980 KB Output is correct
59 Correct 300 ms 19988 KB Output is correct
60 Correct 355 ms 19784 KB Output is correct
61 Correct 299 ms 20080 KB Output is correct
62 Correct 132 ms 17968 KB Output is correct
63 Correct 334 ms 19532 KB Output is correct
64 Correct 300 ms 19380 KB Output is correct
65 Correct 329 ms 19624 KB Output is correct
66 Correct 5 ms 6592 KB Output is correct
67 Correct 300 ms 19884 KB Output is correct
68 Correct 334 ms 19840 KB Output is correct
69 Correct 338 ms 19848 KB Output is correct
70 Correct 356 ms 19960 KB Output is correct
71 Correct 319 ms 19936 KB Output is correct
72 Correct 324 ms 19932 KB Output is correct
73 Correct 337 ms 20304 KB Output is correct
74 Correct 328 ms 20308 KB Output is correct
75 Correct 345 ms 20184 KB Output is correct
76 Correct 339 ms 20260 KB Output is correct
77 Correct 251 ms 19604 KB Output is correct
78 Correct 4 ms 6612 KB Output is correct
79 Correct 4 ms 6740 KB Output is correct
80 Correct 6 ms 6740 KB Output is correct
81 Correct 4 ms 6724 KB Output is correct
82 Correct 6 ms 6824 KB Output is correct
83 Correct 5 ms 6728 KB Output is correct
84 Correct 4 ms 6744 KB Output is correct
85 Correct 4 ms 6740 KB Output is correct
86 Correct 180 ms 8668 KB Output is correct
87 Correct 164 ms 8756 KB Output is correct
88 Correct 168 ms 8908 KB Output is correct
89 Correct 171 ms 8972 KB Output is correct
90 Correct 157 ms 8832 KB Output is correct
91 Correct 157 ms 8812 KB Output is correct
92 Correct 190 ms 8512 KB Output is correct
93 Correct 120 ms 18080 KB Output is correct
94 Correct 143 ms 17320 KB Output is correct
95 Correct 156 ms 17972 KB Output is correct
96 Correct 136 ms 18048 KB Output is correct
97 Correct 157 ms 18032 KB Output is correct
98 Correct 145 ms 18092 KB Output is correct
99 Correct 33 ms 17440 KB Output is correct
100 Correct 326 ms 20048 KB Output is correct
101 Correct 331 ms 20020 KB Output is correct
102 Correct 321 ms 20092 KB Output is correct
103 Correct 298 ms 19584 KB Output is correct
104 Correct 351 ms 19560 KB Output is correct
105 Correct 322 ms 19580 KB Output is correct
106 Correct 311 ms 19312 KB Output is correct
107 Correct 310 ms 19288 KB Output is correct
108 Correct 343 ms 19928 KB Output is correct
109 Correct 345 ms 20012 KB Output is correct
110 Correct 317 ms 19920 KB Output is correct
111 Correct 316 ms 19924 KB Output is correct