oj.uz

Submission #1115111

# Submission time Handle Problem Language Result Execution time Memory
1115111 2024-11-20T04:22:56 Z _callmelucian Event Hopping (BOI22_events) C++14
100 / 100
 126 ms 16728 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pl;
typedef pair<int,int> pii;
typedef tuple<int,int,int> tpl;

#define all(a) a.begin(), a.end()
#define filter(a) a.erase(unique(all(a)), a.end())

const int mn = 1e5 + 5;

struct item {
    int L, R;

    item() : L(INT_MAX), R(0) {}
    item (int L, int R) : L(L), R(R) {}

    bool operator < (const item &o) const {
        if (R == o.R) return L < o.L;
        return R < o.R;
    }
} event[mn];

struct IT {
    vector<int> tr;
    IT (int sz) : tr(4 * sz) {}

    int opr (int a, int b) {
        return (event[a].L < event[b].L ? a : b);
    }

    void update (int pos, int val, int k, int l, int r) {
        for (; l < r;) {
            int mid = (l + r) >> 1;
            if (pos <= mid) k <<= 1, r = mid;
            else k <<= 1, k |= 1, l = mid + 1;
        }

        tr[k] = opr(tr[k], val);
        for (k /= 2; k; k /= 2)
            tr[k] = opr(tr[k << 1], tr[k << 1 | 1]);
    }

    int query (int a, int b, int k, int l, int r) {
        if (b < l || r < a) return 0;
        if (a <= l && r <= b) return tr[k];
        int mid = (l + r) >> 1;
        return opr(query(a, b, 2 * k, l, mid), query(a, b, 2 * k + 1, mid + 1, r));
    }
};

vector<int> cmp;
int nxt[18][mn];

int getID (int targ) {
    return lower_bound(all(cmp), targ) - cmp.begin();
}

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

    int n, q; cin >> n >> q;
    for (int i = 1; i <= n; i++) {
        cin >> event[i].L >> event[i].R;
        cmp.push_back(event[i].L), cmp.push_back(event[i].R);
    }
    sort(all(cmp)), filter(cmp);

    vector<int> ord(n);
    for (int i = 1; i <= n; i++) ord[i - 1] = i;
    sort(all(ord), [&] (int a, int b)
        { return (event[a].R == event[b].R ? event[a].L < event[b].L : event[a].R < event[b].R); });

    IT tree(cmp.size());
    for (int i : ord) {
        event[i].L = getID(event[i].L), event[i].R = getID(event[i].R);
        tree.update(event[i].R, i, 1, 0, cmp.size() - 1);
        nxt[0][i] = tree.query(event[i].L, event[i].R, 1, 0, cmp.size() - 1);

//        cout << "next " << i << " -> " << nxt[0][i] << "\n";
    }

    for (int s = 1; s < 18; s++)
        for (int i = 1; i <= n; i++)
            nxt[s][i] = nxt[s - 1][nxt[s - 1][i]];

    for (int i = 0; i < q; i++) {
        int s, e; cin >> s >> e;
        if (s == e) {
            cout << 0 << "\n";
            continue;
        }
        if (event[s].R > event[e].R) {
            cout << "impossible\n";
            continue;
        }
        if (event[e].L <= event[s].R) {
            cout << 1 << "\n";
            continue;
        }

        int ans = 0;
        for (int lift = 17; lift >= 0; lift--) {
            if (event[nxt[lift][e]].L > event[s].R) e = nxt[lift][e], ans |= (1 << lift);
        }
        e = nxt[0][e], ans++;

        if (event[e].L > event[s].R) cout << "impossible\n";
        else cout << ans + 1 << "\n";
    }


    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7248 KB Output is correct
2 Correct 108 ms 11376 KB Output is correct
3 Correct 100 ms 11456 KB Output is correct
4 Correct 102 ms 11584 KB Output is correct
5 Correct 99 ms 11716 KB Output is correct
6 Correct 108 ms 11888 KB Output is correct
7 Correct 103 ms 11888 KB Output is correct
8 Correct 111 ms 13676 KB Output is correct
9 Correct 109 ms 16576 KB Output is correct
10 Correct 101 ms 15040 KB Output is correct
11 Correct 94 ms 15552 KB Output is correct
12 Correct 63 ms 14304 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7248 KB Output is correct
2 Correct 3 ms 7248 KB Output is correct
3 Correct 2 ms 7248 KB Output is correct
4 Correct 2 ms 7248 KB Output is correct
5 Correct 3 ms 7248 KB Output is correct
6 Correct 4 ms 7480 KB Output is correct
7 Correct 3 ms 7416 KB Output is correct
8 Correct 3 ms 7400 KB Output is correct
9 Correct 3 ms 7248 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7248 KB Output is correct
2 Correct 3 ms 7248 KB Output is correct
3 Correct 2 ms 7248 KB Output is correct
4 Correct 2 ms 7248 KB Output is correct
5 Correct 3 ms 7248 KB Output is correct
6 Correct 4 ms 7480 KB Output is correct
7 Correct 3 ms 7416 KB Output is correct
8 Correct 3 ms 7400 KB Output is correct
9 Correct 3 ms 7248 KB Output is correct
10 Correct 3 ms 7248 KB Output is correct
11 Correct 2 ms 7248 KB Output is correct
12 Correct 3 ms 7248 KB Output is correct
13 Correct 3 ms 7448 KB Output is correct
14 Correct 2 ms 7248 KB Output is correct
15 Correct 3 ms 7248 KB Output is correct
16 Correct 3 ms 7248 KB Output is correct
17 Correct 2 ms 7248 KB Output is correct
18 Correct 2 ms 7248 KB Output is correct
19 Correct 26 ms 9032 KB Output is correct
20 Correct 26 ms 9040 KB Output is correct
21 Correct 28 ms 9160 KB Output is correct
22 Correct 21 ms 9296 KB Output is correct
23 Correct 20 ms 9296 KB Output is correct
24 Correct 20 ms 9296 KB Output is correct
25 Correct 23 ms 8272 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7248 KB Output is correct
2 Correct 3 ms 7248 KB Output is correct
3 Correct 2 ms 7248 KB Output is correct
4 Correct 2 ms 7248 KB Output is correct
5 Correct 3 ms 7248 KB Output is correct
6 Correct 4 ms 7480 KB Output is correct
7 Correct 3 ms 7416 KB Output is correct
8 Correct 3 ms 7400 KB Output is correct
9 Correct 3 ms 7248 KB Output is correct
10 Correct 2 ms 7248 KB Output is correct
11 Correct 2 ms 7248 KB Output is correct
12 Correct 3 ms 7260 KB Output is correct
13 Correct 3 ms 7248 KB Output is correct
14 Correct 2 ms 7248 KB Output is correct
15 Correct 3 ms 7248 KB Output is correct
16 Correct 3 ms 7248 KB Output is correct
17 Correct 3 ms 7416 KB Output is correct
18 Correct 3 ms 7248 KB Output is correct
19 Correct 79 ms 12740 KB Output is correct
20 Correct 67 ms 11972 KB Output is correct
21 Correct 77 ms 12712 KB Output is correct
22 Correct 71 ms 13508 KB Output is correct
23 Correct 80 ms 14288 KB Output is correct
24 Correct 80 ms 14464 KB Output is correct
25 Correct 21 ms 10700 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 11460 KB Output is correct
2 Correct 97 ms 11372 KB Output is correct
3 Correct 99 ms 11584 KB Output is correct
4 Correct 90 ms 13508 KB Output is correct
5 Correct 95 ms 11976 KB Output is correct
6 Correct 101 ms 13252 KB Output is correct
7 Correct 104 ms 13252 KB Output is correct
8 Correct 100 ms 13284 KB Output is correct
9 Correct 74 ms 12484 KB Output is correct
10 Correct 113 ms 12908 KB Output is correct
11 Correct 101 ms 12740 KB Output is correct
12 Correct 102 ms 12928 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7248 KB Output is correct
2 Correct 108 ms 11376 KB Output is correct
3 Correct 100 ms 11456 KB Output is correct
4 Correct 102 ms 11584 KB Output is correct
5 Correct 99 ms 11716 KB Output is correct
6 Correct 108 ms 11888 KB Output is correct
7 Correct 103 ms 11888 KB Output is correct
8 Correct 111 ms 13676 KB Output is correct
9 Correct 109 ms 16576 KB Output is correct
10 Correct 101 ms 15040 KB Output is correct
11 Correct 94 ms 15552 KB Output is correct
12 Correct 63 ms 14304 KB Output is correct
13 Correct 2 ms 7248 KB Output is correct
14 Correct 3 ms 7248 KB Output is correct
15 Correct 2 ms 7248 KB Output is correct
16 Correct 2 ms 7248 KB Output is correct
17 Correct 3 ms 7248 KB Output is correct
18 Correct 4 ms 7480 KB Output is correct
19 Correct 3 ms 7416 KB Output is correct
20 Correct 3 ms 7400 KB Output is correct
21 Correct 3 ms 7248 KB Output is correct
22 Correct 3 ms 7248 KB Output is correct
23 Correct 2 ms 7248 KB Output is correct
24 Correct 3 ms 7248 KB Output is correct
25 Correct 3 ms 7448 KB Output is correct
26 Correct 2 ms 7248 KB Output is correct
27 Correct 3 ms 7248 KB Output is correct
28 Correct 3 ms 7248 KB Output is correct
29 Correct 2 ms 7248 KB Output is correct
30 Correct 2 ms 7248 KB Output is correct
31 Correct 26 ms 9032 KB Output is correct
32 Correct 26 ms 9040 KB Output is correct
33 Correct 28 ms 9160 KB Output is correct
34 Correct 21 ms 9296 KB Output is correct
35 Correct 20 ms 9296 KB Output is correct
36 Correct 20 ms 9296 KB Output is correct
37 Correct 23 ms 8272 KB Output is correct
38 Correct 2 ms 7248 KB Output is correct
39 Correct 2 ms 7248 KB Output is correct
40 Correct 3 ms 7260 KB Output is correct
41 Correct 3 ms 7248 KB Output is correct
42 Correct 2 ms 7248 KB Output is correct
43 Correct 3 ms 7248 KB Output is correct
44 Correct 3 ms 7248 KB Output is correct
45 Correct 3 ms 7416 KB Output is correct
46 Correct 3 ms 7248 KB Output is correct
47 Correct 79 ms 12740 KB Output is correct
48 Correct 67 ms 11972 KB Output is correct
49 Correct 77 ms 12712 KB Output is correct
50 Correct 71 ms 13508 KB Output is correct
51 Correct 80 ms 14288 KB Output is correct
52 Correct 80 ms 14464 KB Output is correct
53 Correct 21 ms 10700 KB Output is correct
54 Correct 84 ms 11460 KB Output is correct
55 Correct 97 ms 11372 KB Output is correct
56 Correct 99 ms 11584 KB Output is correct
57 Correct 90 ms 13508 KB Output is correct
58 Correct 95 ms 11976 KB Output is correct
59 Correct 101 ms 13252 KB Output is correct
60 Correct 104 ms 13252 KB Output is correct
61 Correct 100 ms 13284 KB Output is correct
62 Correct 74 ms 12484 KB Output is correct
63 Correct 113 ms 12908 KB Output is correct
64 Correct 101 ms 12740 KB Output is correct
65 Correct 102 ms 12928 KB Output is correct
66 Correct 2 ms 7416 KB Output is correct
67 Correct 92 ms 14556 KB Output is correct
68 Correct 102 ms 14532 KB Output is correct
69 Correct 109 ms 14020 KB Output is correct
70 Correct 107 ms 14924 KB Output is correct
71 Correct 102 ms 14032 KB Output is correct
72 Correct 109 ms 15052 KB Output is correct
73 Correct 97 ms 16728 KB Output is correct
74 Correct 93 ms 16580 KB Output is correct
75 Correct 98 ms 15052 KB Output is correct
76 Correct 91 ms 15556 KB Output is correct
77 Correct 59 ms 14276 KB Output is correct
78 Correct 2 ms 7248 KB Output is correct
79 Correct 2 ms 7248 KB Output is correct
80 Correct 2 ms 7248 KB Output is correct
81 Correct 2 ms 7248 KB Output is correct
82 Correct 2 ms 7248 KB Output is correct
83 Correct 2 ms 7248 KB Output is correct
84 Correct 2 ms 7248 KB Output is correct
85 Correct 2 ms 7248 KB Output is correct
86 Correct 25 ms 9096 KB Output is correct
87 Correct 26 ms 8980 KB Output is correct
88 Correct 25 ms 9544 KB Output is correct
89 Correct 20 ms 9296 KB Output is correct
90 Correct 20 ms 9296 KB Output is correct
91 Correct 18 ms 9296 KB Output is correct
92 Correct 22 ms 9056 KB Output is correct
93 Correct 65 ms 12740 KB Output is correct
94 Correct 61 ms 11972 KB Output is correct
95 Correct 77 ms 12752 KB Output is correct
96 Correct 67 ms 13508 KB Output is correct
97 Correct 74 ms 14280 KB Output is correct
98 Correct 76 ms 14340 KB Output is correct
99 Correct 20 ms 10692 KB Output is correct
100 Correct 104 ms 16336 KB Output is correct
101 Correct 108 ms 16324 KB Output is correct
102 Correct 112 ms 16324 KB Output is correct
103 Correct 111 ms 16072 KB Output is correct
104 Correct 108 ms 15808 KB Output is correct
105 Correct 111 ms 15844 KB Output is correct
106 Correct 96 ms 13764 KB Output is correct
107 Correct 109 ms 14020 KB Output is correct
108 Correct 102 ms 14784 KB Output is correct
109 Correct 106 ms 14788 KB Output is correct
110 Correct 118 ms 16072 KB Output is correct
111 Correct 126 ms 16324 KB Output is correct