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Submission #1050666

# Submission time Handle Problem Language Result Execution time Memory
1050666 2024-08-09T12:16:32 Z VMaksimoski008 Event Hopping (BOI22_events) C++17
100 / 100
 149 ms 33136 KB 
#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;

const int maxn = 1e5 + 5;

struct SegTree {
    int n;
    vector<pii> tree;

    SegTree(int _n) : n(_n), tree(4*_n+5, { 1e9, 0 }) {}

    void update(int u, int tl, int tr, int p, int L, int id) {
        if(tl == tr) {
            tree[u] = min(tree[u], pii{ L, id });
        } else {
            int tm = (tl + tr) / 2;
            if(p <= tm) update(2*u, tl, tm, p, L, id);
            else update(2*u+1, tm+1, tr, p, L, id);
            tree[u] = min(tree[2*u], tree[2*u+1]);
        }
    }

    pii query(int u, int tl, int tr, int l, int r) {
        if(tl > tr || l > tr || tl > r) return { 1e9, 0 };
        if(l <= tl && tr <= r) return tree[u];
        int tm = (tl + tr) / 2;
        return min(query(2*u, tl, tm, l, r), query(2*u+1, tm+1, tr, l, r));
    }

    void update(int p, int L, int id) { update(1, 0, n-1, p, L, id); }
    pii query(int l, int r) { return query(1, 0, n-1, l, r); }
};

vector<int> graph[maxn];
int up[maxn][20];

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

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

    vector<array<int, 3> > v(n+1); set<int> s;
    vector<int> L(n+1), R(n+1);
    for(int i=1; i<=n; i++) {
        cin >> v[i][1] >> v[i][0]; v[i][2] = i;
        s.insert(v[i][1]); s.insert(v[i][0]);
        L[i] = v[i][1]; R[i] = v[i][0];
    }


    vector<int> comp(s.begin(), s.end());
    for(auto &[r, l, id] : v) {
        if(l == 0 && r == 0) continue;
        l = lower_bound(comp.begin(), comp.end(), l) - comp.begin();
        r = lower_bound(comp.begin(), comp.end(), r) - comp.begin();
    }
    
    SegTree tree(2*n);
    sort(v.begin(), v.end());
    for(auto &[r, l, id] : v) {
        auto [x, y] = tree.query(l, r);
        if(y) up[id][0] = y;
        tree.update(r, l, id);
    }

    for(int j=1; j<20; j++)
        for(int i=1; i<=n; i++) up[i][j] = up[up[i][j-1]][j-1];

    while(q--) {
        int a, b;
        cin >> a >> b;

        if(a == b) {
            cout << 0 << '\n';
            continue;
        }

        if(R[a] > R[b]) {
            cout << "impossible\n";
            continue;
        }

        int ans = 0;
        for(int j=19; j>=0; j--)
            if(up[b][j] != 0 && L[up[b][j]] > R[a]) b = up[b][j], ans |= (1 << j);

        if(a == b) cout << ans << '\n';
        else if(L[b] <= R[a]) cout << ans + 1 << '\n';
        else if(up[b][0] && L[up[b][0]] <= R[a]) cout << ans + 2 << '\n';
        else cout << "impossible\n";
    }

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4184 KB Output is correct
2 Correct 105 ms 27596 KB Output is correct
3 Correct 103 ms 27600 KB Output is correct
4 Correct 116 ms 27472 KB Output is correct
5 Correct 111 ms 28064 KB Output is correct
6 Correct 110 ms 28620 KB Output is correct
7 Correct 108 ms 28772 KB Output is correct
8 Correct 113 ms 33104 KB Output is correct
9 Correct 110 ms 33136 KB Output is correct
10 Correct 110 ms 27868 KB Output is correct
11 Correct 115 ms 29868 KB Output is correct
12 Correct 70 ms 27216 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4188 KB Output is correct
2 Correct 1 ms 4188 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 2 ms 4444 KB Output is correct
8 Correct 2 ms 4404 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4188 KB Output is correct
2 Correct 1 ms 4188 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 2 ms 4444 KB Output is correct
8 Correct 2 ms 4404 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4188 KB Output is correct
11 Correct 1 ms 4188 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 2 ms 4344 KB Output is correct
14 Correct 2 ms 4444 KB Output is correct
15 Correct 2 ms 4484 KB Output is correct
16 Correct 2 ms 4444 KB Output is correct
17 Correct 2 ms 4444 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 21 ms 8772 KB Output is correct
20 Correct 20 ms 8536 KB Output is correct
21 Correct 23 ms 8796 KB Output is correct
22 Correct 17 ms 9052 KB Output is correct
23 Correct 19 ms 9052 KB Output is correct
24 Correct 20 ms 9040 KB Output is correct
25 Correct 19 ms 8540 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4188 KB Output is correct
2 Correct 1 ms 4188 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 2 ms 4444 KB Output is correct
8 Correct 2 ms 4404 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4188 KB Output is correct
11 Correct 1 ms 4188 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 2 ms 4444 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 2 ms 4444 KB Output is correct
16 Correct 2 ms 4444 KB Output is correct
17 Correct 2 ms 4444 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 92 ms 25892 KB Output is correct
20 Correct 80 ms 25028 KB Output is correct
21 Correct 88 ms 25680 KB Output is correct
22 Correct 95 ms 27728 KB Output is correct
23 Correct 121 ms 30920 KB Output is correct
24 Correct 120 ms 30912 KB Output is correct
25 Correct 33 ms 20088 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 27632 KB Output is correct
2 Correct 100 ms 27472 KB Output is correct
3 Correct 108 ms 27472 KB Output is correct
4 Correct 110 ms 33064 KB Output is correct
5 Correct 106 ms 27980 KB Output is correct
6 Correct 132 ms 32656 KB Output is correct
7 Correct 137 ms 32728 KB Output is correct
8 Correct 141 ms 32808 KB Output is correct
9 Correct 106 ms 30800 KB Output is correct
10 Correct 136 ms 32336 KB Output is correct
11 Correct 149 ms 32216 KB Output is correct
12 Correct 143 ms 32428 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4184 KB Output is correct
2 Correct 105 ms 27596 KB Output is correct
3 Correct 103 ms 27600 KB Output is correct
4 Correct 116 ms 27472 KB Output is correct
5 Correct 111 ms 28064 KB Output is correct
6 Correct 110 ms 28620 KB Output is correct
7 Correct 108 ms 28772 KB Output is correct
8 Correct 113 ms 33104 KB Output is correct
9 Correct 110 ms 33136 KB Output is correct
10 Correct 110 ms 27868 KB Output is correct
11 Correct 115 ms 29868 KB Output is correct
12 Correct 70 ms 27216 KB Output is correct
13 Correct 1 ms 4188 KB Output is correct
14 Correct 1 ms 4188 KB Output is correct
15 Correct 2 ms 4444 KB Output is correct
16 Correct 2 ms 4444 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 2 ms 4444 KB Output is correct
19 Correct 2 ms 4444 KB Output is correct
20 Correct 2 ms 4404 KB Output is correct
21 Correct 1 ms 4444 KB Output is correct
22 Correct 1 ms 4188 KB Output is correct
23 Correct 1 ms 4188 KB Output is correct
24 Correct 1 ms 4444 KB Output is correct
25 Correct 2 ms 4344 KB Output is correct
26 Correct 2 ms 4444 KB Output is correct
27 Correct 2 ms 4484 KB Output is correct
28 Correct 2 ms 4444 KB Output is correct
29 Correct 2 ms 4444 KB Output is correct
30 Correct 1 ms 4444 KB Output is correct
31 Correct 21 ms 8772 KB Output is correct
32 Correct 20 ms 8536 KB Output is correct
33 Correct 23 ms 8796 KB Output is correct
34 Correct 17 ms 9052 KB Output is correct
35 Correct 19 ms 9052 KB Output is correct
36 Correct 20 ms 9040 KB Output is correct
37 Correct 19 ms 8540 KB Output is correct
38 Correct 1 ms 4188 KB Output is correct
39 Correct 1 ms 4188 KB Output is correct
40 Correct 1 ms 4444 KB Output is correct
41 Correct 2 ms 4444 KB Output is correct
42 Correct 1 ms 4444 KB Output is correct
43 Correct 2 ms 4444 KB Output is correct
44 Correct 2 ms 4444 KB Output is correct
45 Correct 2 ms 4444 KB Output is correct
46 Correct 1 ms 4444 KB Output is correct
47 Correct 92 ms 25892 KB Output is correct
48 Correct 80 ms 25028 KB Output is correct
49 Correct 88 ms 25680 KB Output is correct
50 Correct 95 ms 27728 KB Output is correct
51 Correct 121 ms 30920 KB Output is correct
52 Correct 120 ms 30912 KB Output is correct
53 Correct 33 ms 20088 KB Output is correct
54 Correct 97 ms 27632 KB Output is correct
55 Correct 100 ms 27472 KB Output is correct
56 Correct 108 ms 27472 KB Output is correct
57 Correct 110 ms 33064 KB Output is correct
58 Correct 106 ms 27980 KB Output is correct
59 Correct 132 ms 32656 KB Output is correct
60 Correct 137 ms 32728 KB Output is correct
61 Correct 141 ms 32808 KB Output is correct
62 Correct 106 ms 30800 KB Output is correct
63 Correct 136 ms 32336 KB Output is correct
64 Correct 149 ms 32216 KB Output is correct
65 Correct 143 ms 32428 KB Output is correct
66 Correct 1 ms 4188 KB Output is correct
67 Correct 103 ms 27608 KB Output is correct
68 Correct 98 ms 27600 KB Output is correct
69 Correct 108 ms 27480 KB Output is correct
70 Correct 103 ms 27984 KB Output is correct
71 Correct 105 ms 28500 KB Output is correct
72 Correct 110 ms 28756 KB Output is correct
73 Correct 114 ms 32988 KB Output is correct
74 Correct 108 ms 33056 KB Output is correct
75 Correct 106 ms 27984 KB Output is correct
76 Correct 116 ms 29832 KB Output is correct
77 Correct 70 ms 27216 KB Output is correct
78 Correct 1 ms 4188 KB Output is correct
79 Correct 2 ms 4444 KB Output is correct
80 Correct 2 ms 4444 KB Output is correct
81 Correct 2 ms 4444 KB Output is correct
82 Correct 2 ms 4440 KB Output is correct
83 Correct 2 ms 4440 KB Output is correct
84 Correct 2 ms 4444 KB Output is correct
85 Correct 1 ms 4444 KB Output is correct
86 Correct 21 ms 8664 KB Output is correct
87 Correct 19 ms 8540 KB Output is correct
88 Correct 21 ms 8796 KB Output is correct
89 Correct 17 ms 9052 KB Output is correct
90 Correct 18 ms 9048 KB Output is correct
91 Correct 17 ms 9052 KB Output is correct
92 Correct 19 ms 8792 KB Output is correct
93 Correct 81 ms 25684 KB Output is correct
94 Correct 79 ms 24924 KB Output is correct
95 Correct 90 ms 25828 KB Output is correct
96 Correct 86 ms 27532 KB Output is correct
97 Correct 107 ms 30800 KB Output is correct
98 Correct 113 ms 30808 KB Output is correct
99 Correct 32 ms 19944 KB Output is correct
100 Correct 136 ms 32756 KB Output is correct
101 Correct 134 ms 32672 KB Output is correct
102 Correct 141 ms 32788 KB Output is correct
103 Correct 139 ms 32336 KB Output is correct
104 Correct 133 ms 32232 KB Output is correct
105 Correct 130 ms 32476 KB Output is correct
106 Correct 96 ms 25680 KB Output is correct
107 Correct 112 ms 26848 KB Output is correct
108 Correct 102 ms 27704 KB Output is correct
109 Correct 102 ms 27728 KB Output is correct
110 Correct 147 ms 32572 KB Output is correct
111 Correct 147 ms 32972 KB Output is correct