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Submission #779665

# Submission time Handle Problem Language Result Execution time Memory
779665 2023-07-11T15:50:32 Z CpDark Event Hopping (BOI22_events) C++14
100 / 100
 159 ms 19048 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef vector<pii> vp;
typedef vector<vp> vvp;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<ll> vll;
typedef vector<vll> vvll;

const int inf = 1e9 + 7;

struct segmentTree
{
    vp st;
    int size;
    segmentTree() {};
    void init(int n) {
        for (size = 1;size < n;size *= 2) {}
        st.resize(size * 2, { inf, -1 });
    }

    void update(int i, pii val) {
        i += size;
        if (st[i].first <= val.first)return;
        st[i] = val;
        for (i /= 2;i;i /= 2) {
            if (st[i * 2].first <= st[i * 2 + 1].first) {
                st[i] = st[i * 2];
            }
            else st[i] = st[i * 2 + 1];
        }
    }

    pii query(int l, int r) {
        pii ans = { inf,0 };
        for (l += size, r += size;l <= r;l /= 2, r /= 2) {
            if (l % 2) {
                if (ans.first > st[l].first)ans = st[l];
                l++;
            }
            if (r % 2 == 0) {
                if (ans.first > st[r].first)ans = st[r];
                r--;
            }
        }
        return ans;
    }
};

vi times;
vvi table;
vp events;
vector<pair<int, pii>> endTimes;

int mylog;

int query(int start, int end) {
    if (start == end)return 0;
    if (events[start].second > events[end].second)return -1;
    int wall = events[start].second;
    int jumps = 1;
    if (events[end].first <= wall && wall <= events[end].second) return jumps;
    
    for (int i = mylog;i >= 0;i--) {
        if (events[table[i][end]].first > wall) {
            jumps += 1 << i;
            end = table[i][end];
        }
    }
    jumps++;
    end = table[0][end];
    if (events[end].first <= wall && wall <= events[end].second)return jumps;
    return -1;
}

int id(int val) {
    int ans = lower_bound(times.begin(), times.end(), val) - times.begin();
    return ans;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n, q;
    cin >> n >> q;
    mylog = ceil(log2(n + 1));
    events.resize(n);
    endTimes.resize(n);
    table.resize(mylog + 1, vi(n));
    
    for (int i = 0;i < n;i++) {
        cin >> events[i].first >> events[i].second;
        times.push_back(events[i].first);
        times.push_back(events[i].second);
        endTimes[i] = { events[i].second, {events[i].first, i} };
    }
    times.push_back(inf);

    sort(times.begin(), times.end());
    sort(endTimes.begin(), endTimes.end());

    segmentTree st;
    st.init(times.size());
    for (int i = 0;i < endTimes.size();i++) {
        int index = endTimes[i].second.second;
        st.update(id(events[index].second), { events[index].first, index });
        int far = st.query(id(events[index].first), id(events[index].second)).second;
        table[0][index] = far;
    }
 
    for (int i = 1;i <= mylog;i++) {
        for (int v = 0;v < n;v++) {
            int p = table[i - 1][v];
            table[i][v] = table[i - 1][p];
        }
    }
 
    int s, e;
    for (int i = 0;i < q;i++) {
        cin >> s >> e;
        s--; e--;
        int ans = query(s, e);
        if (ans == -1) {
            cout << "impossible\n";
        }
        else {
            cout << ans << '\n';
        }
    }
 
    return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:110:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  110 |     for (int i = 0;i < endTimes.size();i++) {
      |                    ~~^~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 91 ms 18404 KB Output is correct
3 Correct 110 ms 18448 KB Output is correct
4 Correct 129 ms 18340 KB Output is correct
5 Correct 104 ms 18508 KB Output is correct
6 Correct 100 ms 18452 KB Output is correct
7 Correct 116 ms 18568 KB Output is correct
8 Correct 108 ms 18880 KB Output is correct
9 Correct 159 ms 18852 KB Output is correct
10 Correct 96 ms 18816 KB Output is correct
11 Correct 93 ms 18768 KB Output is correct
12 Correct 60 ms 18188 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 36 ms 2508 KB Output is correct
20 Correct 24 ms 2496 KB Output is correct
21 Correct 26 ms 2736 KB Output is correct
22 Correct 21 ms 2900 KB Output is correct
23 Correct 21 ms 2660 KB Output is correct
24 Correct 19 ms 2636 KB Output is correct
25 Correct 22 ms 2288 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 316 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 61 ms 16704 KB Output is correct
20 Correct 57 ms 15860 KB Output is correct
21 Correct 66 ms 16576 KB Output is correct
22 Correct 66 ms 16604 KB Output is correct
23 Correct 66 ms 16688 KB Output is correct
24 Correct 67 ms 16688 KB Output is correct
25 Correct 33 ms 15932 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 81 ms 18368 KB Output is correct
2 Correct 95 ms 18380 KB Output is correct
3 Correct 102 ms 18448 KB Output is correct
4 Correct 104 ms 18880 KB Output is correct
5 Correct 93 ms 18696 KB Output is correct
6 Correct 107 ms 18568 KB Output is correct
7 Correct 102 ms 18536 KB Output is correct
8 Correct 97 ms 18636 KB Output is correct
9 Correct 68 ms 16584 KB Output is correct
10 Correct 98 ms 18196 KB Output is correct
11 Correct 93 ms 17968 KB Output is correct
12 Correct 98 ms 18124 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 91 ms 18404 KB Output is correct
3 Correct 110 ms 18448 KB Output is correct
4 Correct 129 ms 18340 KB Output is correct
5 Correct 104 ms 18508 KB Output is correct
6 Correct 100 ms 18452 KB Output is correct
7 Correct 116 ms 18568 KB Output is correct
8 Correct 108 ms 18880 KB Output is correct
9 Correct 159 ms 18852 KB Output is correct
10 Correct 96 ms 18816 KB Output is correct
11 Correct 93 ms 18768 KB Output is correct
12 Correct 60 ms 18188 KB Output is correct
13 Correct 1 ms 320 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 0 ms 212 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 2 ms 340 KB Output is correct
29 Correct 1 ms 336 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 36 ms 2508 KB Output is correct
32 Correct 24 ms 2496 KB Output is correct
33 Correct 26 ms 2736 KB Output is correct
34 Correct 21 ms 2900 KB Output is correct
35 Correct 21 ms 2660 KB Output is correct
36 Correct 19 ms 2636 KB Output is correct
37 Correct 22 ms 2288 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 1 ms 316 KB Output is correct
40 Correct 1 ms 340 KB Output is correct
41 Correct 1 ms 340 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 1 ms 340 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 61 ms 16704 KB Output is correct
48 Correct 57 ms 15860 KB Output is correct
49 Correct 66 ms 16576 KB Output is correct
50 Correct 66 ms 16604 KB Output is correct
51 Correct 66 ms 16688 KB Output is correct
52 Correct 67 ms 16688 KB Output is correct
53 Correct 33 ms 15932 KB Output is correct
54 Correct 81 ms 18368 KB Output is correct
55 Correct 95 ms 18380 KB Output is correct
56 Correct 102 ms 18448 KB Output is correct
57 Correct 104 ms 18880 KB Output is correct
58 Correct 93 ms 18696 KB Output is correct
59 Correct 107 ms 18568 KB Output is correct
60 Correct 102 ms 18536 KB Output is correct
61 Correct 97 ms 18636 KB Output is correct
62 Correct 68 ms 16584 KB Output is correct
63 Correct 98 ms 18196 KB Output is correct
64 Correct 93 ms 17968 KB Output is correct
65 Correct 98 ms 18124 KB Output is correct
66 Correct 1 ms 212 KB Output is correct
67 Correct 82 ms 18396 KB Output is correct
68 Correct 92 ms 18428 KB Output is correct
69 Correct 101 ms 18372 KB Output is correct
70 Correct 106 ms 18436 KB Output is correct
71 Correct 97 ms 18440 KB Output is correct
72 Correct 117 ms 18580 KB Output is correct
73 Correct 99 ms 18936 KB Output is correct
74 Correct 106 ms 19048 KB Output is correct
75 Correct 96 ms 18804 KB Output is correct
76 Correct 97 ms 18768 KB Output is correct
77 Correct 60 ms 18112 KB Output is correct
78 Correct 1 ms 212 KB Output is correct
79 Correct 1 ms 340 KB Output is correct
80 Correct 1 ms 464 KB Output is correct
81 Correct 1 ms 340 KB Output is correct
82 Correct 1 ms 328 KB Output is correct
83 Correct 2 ms 328 KB Output is correct
84 Correct 1 ms 340 KB Output is correct
85 Correct 1 ms 340 KB Output is correct
86 Correct 26 ms 2504 KB Output is correct
87 Correct 24 ms 2556 KB Output is correct
88 Correct 26 ms 2736 KB Output is correct
89 Correct 22 ms 2884 KB Output is correct
90 Correct 20 ms 2700 KB Output is correct
91 Correct 22 ms 2704 KB Output is correct
92 Correct 23 ms 2388 KB Output is correct
93 Correct 60 ms 16712 KB Output is correct
94 Correct 56 ms 15816 KB Output is correct
95 Correct 66 ms 16576 KB Output is correct
96 Correct 62 ms 16672 KB Output is correct
97 Correct 67 ms 16676 KB Output is correct
98 Correct 66 ms 16692 KB Output is correct
99 Correct 32 ms 16032 KB Output is correct
100 Correct 116 ms 18576 KB Output is correct
101 Correct 98 ms 18504 KB Output is correct
102 Correct 104 ms 18700 KB Output is correct
103 Correct 98 ms 18180 KB Output is correct
104 Correct 93 ms 17924 KB Output is correct
105 Correct 97 ms 18252 KB Output is correct
106 Correct 94 ms 17856 KB Output is correct
107 Correct 95 ms 17796 KB Output is correct
108 Correct 89 ms 18556 KB Output is correct
109 Correct 96 ms 18496 KB Output is correct
110 Correct 106 ms 18432 KB Output is correct
111 Correct 109 ms 18448 KB Output is correct