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Submission #1048455

# Submission time Handle Problem Language Result Execution time Memory
1048455 2024-08-08T07:44:27 Z sofijavelkovska Event Hopping (BOI22_events) C++17
100 / 100
 141 ms 16208 KB 
#include <bits/stdc++.h>
using namespace std;

const int MAXN=(1<<18), LOG=17;

int l[MAXN], r[MAXN];
int tree[2*MAXN-1];

int compare(int x, int y)
{
    if (x==-1 || y==-1)
        return max(x, y);
    if (l[x]<l[y])
        return x;

    return y;
}

int find(int x, int l, int r, int lt, int rt)
{
    if (l>=rt || r<=lt)
        return -1;
    if (l>=lt && r<=rt)
        return tree[x];

    return compare(find(2*x+1, l, (l+r)/2, lt, rt), find(2*x+2, (l+r)/2, r, lt, rt));
}

void update(int x, int l, int r, int index, int value)
{
    if (l>index || r<=index)
        return;
    if (r-l==1)
    {
        tree[x]=compare(tree[x], value);
        return;
    }
    update(2*x+1, l, (l+r)/2, index, value);
    update(2*x+2, (l+r)/2, r, index, value);
    tree[x]=compare(tree[2*x+1], tree[2*x+2]);

    return;
}

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

    int n, q;
    cin >> n >> q;
    for (int i=0; i<n; i++)
        cin >> l[i] >> r[i];
    vector<int> temp;
    for (int i=0; i<n; i++)
    {
        temp.push_back(l[i]);
        temp.push_back(r[i]);
    }
    sort(temp.begin(), temp.end());
    vector<int> compress;
    for (auto x : temp)
        if (compress.empty() || x!=compress.back())
            compress.push_back(x);
    for (int i=0; i<2*MAXN-1; i++)
        tree[i]=-1;
    for (int i=0; i<n; i++)
    {
        int rightindex=lower_bound(compress.begin(), compress.end(), r[i])-compress.begin();
        update(0, 0, MAXN, rightindex, i);
    }
    int prev[n];
    for (int i=0; i<n; i++)
        prev[i]=-1;
    for (int i=0; i<n; i++)
    {
        int leftindex=lower_bound(compress.begin(), compress.end(), l[i])-compress.begin();
        int rightindex=lower_bound(compress.begin(), compress.end(), r[i])-compress.begin();
        prev[i]=find(0, 0, MAXN, leftindex, rightindex+1);
        if (prev[i]==i)
            prev[i]=-1;
    }
    int blift[n][LOG];
    for (int i=0; i<n; i++)
        for (int j=0; j<LOG; j++)
            blift[i][j]=-1;
    for (int i=0; i<n; i++)
        blift[i][0]=prev[i];
    for (int j=1; j<LOG; j++)
        for (int i=0; i<n; i++)
            if (blift[i][j-1]!=-1)
                blift[i][j]=blift[blift[i][j-1]][j-1];
    /*for (int j=0; j<3; j++)
    {
        for (int i=0; i<n; i++)
            cout << blift[i][j]+1 << ' ';
        cout << '\n';
    }*/
    while (q--)
    {
        int x, y;
        cin >> x >> y;
        x=x-1;
        y=y-1;
        if (x==y)
        {
            cout << 0 << '\n';
            continue;
        }
        if (r[x]>r[y])
        {
            cout << "impossible" << '\n';
            continue;
        }
        int total=0;
        //int i=lower_bound(compress.begin(), compress.end(), l[y])-compress.begin();
        //cout << "x y " << x+1 << ' ' << y+1 << '\n';
        //cout << "y " << y+1 << '\n';
        for (int j=LOG-1; j>=0; j--)
            if (blift[y][j]!=-1 && l[blift[y][j]]>r[x])
            {
                y=blift[y][j];
                //cout << "y " << y+1 << '\n';
                total=total+(1<<j);
            }
        if (l[y]<=r[x])
            cout << total+1 << '\n';
        else if (blift[y][0]!=-1 && l[blift[y][0]]<=r[x])
            cout << total+2 << '\n';
        else
            cout << "impossible" << '\n';
    }

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 98 ms 12500 KB Output is correct
3 Correct 101 ms 12404 KB Output is correct
4 Correct 113 ms 12488 KB Output is correct
5 Correct 115 ms 15776 KB Output is correct
6 Correct 106 ms 15748 KB Output is correct
7 Correct 108 ms 15824 KB Output is correct
8 Correct 96 ms 16208 KB Output is correct
9 Correct 100 ms 16204 KB Output is correct
10 Correct 108 ms 15868 KB Output is correct
11 Correct 111 ms 15688 KB Output is correct
12 Correct 55 ms 15336 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 1 ms 2648 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2788 KB Output is correct
6 Correct 1 ms 2784 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2652 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 1 ms 2648 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2788 KB Output is correct
6 Correct 1 ms 2784 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2652 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 0 ms 2652 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2652 KB Output is correct
15 Correct 1 ms 2708 KB Output is correct
16 Correct 1 ms 2652 KB Output is correct
17 Correct 1 ms 2652 KB Output is correct
18 Correct 1 ms 2652 KB Output is correct
19 Correct 27 ms 4520 KB Output is correct
20 Correct 21 ms 4432 KB Output is correct
21 Correct 21 ms 4872 KB Output is correct
22 Correct 16 ms 4944 KB Output is correct
23 Correct 17 ms 4700 KB Output is correct
24 Correct 17 ms 4700 KB Output is correct
25 Correct 18 ms 4460 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 1 ms 2648 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2788 KB Output is correct
6 Correct 1 ms 2784 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2652 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 0 ms 2652 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2724 KB Output is correct
15 Correct 1 ms 2780 KB Output is correct
16 Correct 1 ms 2648 KB Output is correct
17 Correct 1 ms 2652 KB Output is correct
18 Correct 1 ms 2652 KB Output is correct
19 Correct 83 ms 13772 KB Output is correct
20 Correct 82 ms 13008 KB Output is correct
21 Correct 105 ms 13828 KB Output is correct
22 Correct 90 ms 13632 KB Output is correct
23 Correct 103 ms 13796 KB Output is correct
24 Correct 101 ms 13736 KB Output is correct
25 Correct 40 ms 12292 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 12540 KB Output is correct
2 Correct 115 ms 12412 KB Output is correct
3 Correct 118 ms 12416 KB Output is correct
4 Correct 105 ms 16072 KB Output is correct
5 Correct 122 ms 15844 KB Output is correct
6 Correct 123 ms 15860 KB Output is correct
7 Correct 141 ms 15696 KB Output is correct
8 Correct 140 ms 15800 KB Output is correct
9 Correct 103 ms 13820 KB Output is correct
10 Correct 120 ms 15348 KB Output is correct
11 Correct 118 ms 15092 KB Output is correct
12 Correct 123 ms 15440 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 98 ms 12500 KB Output is correct
3 Correct 101 ms 12404 KB Output is correct
4 Correct 113 ms 12488 KB Output is correct
5 Correct 115 ms 15776 KB Output is correct
6 Correct 106 ms 15748 KB Output is correct
7 Correct 108 ms 15824 KB Output is correct
8 Correct 96 ms 16208 KB Output is correct
9 Correct 100 ms 16204 KB Output is correct
10 Correct 108 ms 15868 KB Output is correct
11 Correct 111 ms 15688 KB Output is correct
12 Correct 55 ms 15336 KB Output is correct
13 Correct 1 ms 2648 KB Output is correct
14 Correct 1 ms 2648 KB Output is correct
15 Correct 1 ms 2652 KB Output is correct
16 Correct 1 ms 2652 KB Output is correct
17 Correct 1 ms 2788 KB Output is correct
18 Correct 1 ms 2784 KB Output is correct
19 Correct 1 ms 2652 KB Output is correct
20 Correct 1 ms 2652 KB Output is correct
21 Correct 1 ms 2652 KB Output is correct
22 Correct 1 ms 2652 KB Output is correct
23 Correct 0 ms 2652 KB Output is correct
24 Correct 1 ms 2652 KB Output is correct
25 Correct 1 ms 2652 KB Output is correct
26 Correct 1 ms 2652 KB Output is correct
27 Correct 1 ms 2708 KB Output is correct
28 Correct 1 ms 2652 KB Output is correct
29 Correct 1 ms 2652 KB Output is correct
30 Correct 1 ms 2652 KB Output is correct
31 Correct 27 ms 4520 KB Output is correct
32 Correct 21 ms 4432 KB Output is correct
33 Correct 21 ms 4872 KB Output is correct
34 Correct 16 ms 4944 KB Output is correct
35 Correct 17 ms 4700 KB Output is correct
36 Correct 17 ms 4700 KB Output is correct
37 Correct 18 ms 4460 KB Output is correct
38 Correct 1 ms 2652 KB Output is correct
39 Correct 0 ms 2652 KB Output is correct
40 Correct 1 ms 2652 KB Output is correct
41 Correct 1 ms 2652 KB Output is correct
42 Correct 1 ms 2724 KB Output is correct
43 Correct 1 ms 2780 KB Output is correct
44 Correct 1 ms 2648 KB Output is correct
45 Correct 1 ms 2652 KB Output is correct
46 Correct 1 ms 2652 KB Output is correct
47 Correct 83 ms 13772 KB Output is correct
48 Correct 82 ms 13008 KB Output is correct
49 Correct 105 ms 13828 KB Output is correct
50 Correct 90 ms 13632 KB Output is correct
51 Correct 103 ms 13796 KB Output is correct
52 Correct 101 ms 13736 KB Output is correct
53 Correct 40 ms 12292 KB Output is correct
54 Correct 104 ms 12540 KB Output is correct
55 Correct 115 ms 12412 KB Output is correct
56 Correct 118 ms 12416 KB Output is correct
57 Correct 105 ms 16072 KB Output is correct
58 Correct 122 ms 15844 KB Output is correct
59 Correct 123 ms 15860 KB Output is correct
60 Correct 141 ms 15696 KB Output is correct
61 Correct 140 ms 15800 KB Output is correct
62 Correct 103 ms 13820 KB Output is correct
63 Correct 120 ms 15348 KB Output is correct
64 Correct 118 ms 15092 KB Output is correct
65 Correct 123 ms 15440 KB Output is correct
66 Correct 0 ms 2508 KB Output is correct
67 Correct 110 ms 15716 KB Output is correct
68 Correct 110 ms 15732 KB Output is correct
69 Correct 118 ms 15600 KB Output is correct
70 Correct 112 ms 15768 KB Output is correct
71 Correct 140 ms 15668 KB Output is correct
72 Correct 115 ms 15752 KB Output is correct
73 Correct 103 ms 15992 KB Output is correct
74 Correct 96 ms 15996 KB Output is correct
75 Correct 126 ms 16064 KB Output is correct
76 Correct 130 ms 15808 KB Output is correct
77 Correct 72 ms 15472 KB Output is correct
78 Correct 0 ms 2652 KB Output is correct
79 Correct 1 ms 2780 KB Output is correct
80 Correct 1 ms 2652 KB Output is correct
81 Correct 1 ms 2652 KB Output is correct
82 Correct 1 ms 2648 KB Output is correct
83 Correct 1 ms 2780 KB Output is correct
84 Correct 1 ms 2780 KB Output is correct
85 Correct 1 ms 2652 KB Output is correct
86 Correct 34 ms 4388 KB Output is correct
87 Correct 25 ms 4568 KB Output is correct
88 Correct 26 ms 4848 KB Output is correct
89 Correct 17 ms 4916 KB Output is correct
90 Correct 19 ms 4700 KB Output is correct
91 Correct 18 ms 4768 KB Output is correct
92 Correct 18 ms 4504 KB Output is correct
93 Correct 97 ms 13860 KB Output is correct
94 Correct 92 ms 13184 KB Output is correct
95 Correct 88 ms 13624 KB Output is correct
96 Correct 94 ms 13680 KB Output is correct
97 Correct 105 ms 13788 KB Output is correct
98 Correct 95 ms 13848 KB Output is correct
99 Correct 39 ms 12492 KB Output is correct
100 Correct 133 ms 15800 KB Output is correct
101 Correct 117 ms 15816 KB Output is correct
102 Correct 116 ms 15856 KB Output is correct
103 Correct 117 ms 15348 KB Output is correct
104 Correct 116 ms 15180 KB Output is correct
105 Correct 118 ms 15424 KB Output is correct
106 Correct 99 ms 15052 KB Output is correct
107 Correct 109 ms 15052 KB Output is correct
108 Correct 102 ms 15820 KB Output is correct
109 Correct 107 ms 15816 KB Output is correct
110 Correct 118 ms 15692 KB Output is correct
111 Correct 120 ms 15696 KB Output is correct