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Submission #967773

# Submission time Handle Problem Language Result Execution time Memory
967773 2024-04-22T19:34:28 Z maxFedorchuk Event Hopping (BOI22_events) C++17
100 / 100
 240 ms 37356 KB 
#include <bits/stdc++.h>
using namespace std;

const long long MX=2e5+10;
const long long INF=1e9;

pair < int , int > tree[4*MX];
void upd(int v,int tl,int tr,int in,pair < int , int > zn)
{
    if(tl==tr)
    {
        tree[v]=min(tree[v],zn);
        return;
    }

    int mid=(tl+tr)/2;
    if(in<=mid)
    {
        upd(v*2,tl,mid,in,zn);
    }
    else
    {
        upd(v*2+1,mid+1,tr,in,zn);
    }

    tree[v]=min(tree[v*2],tree[v*2+1]);
}
pair < int , int > fget(int v,int tl,int tr,int l,int r)
{
    if(r<tl || tr<l)
    {
        return make_pair(INF,0);
    }

    if(l<=tl && tr<=r)
    {
        return tree[v];
    }

    int mid=(tl+tr)/2;
    return min(fget(v*2,tl,mid,l,r),fget(v*2+1,mid+1,tr,l,r));
}

int l[MX],r[MX];
int n,k;

void compr()
{
    map < int , int > mp;

    for(int i=1;i<=n;i++)
    {
        mp[l[i]]=1;
        mp[r[i]]=1;
    }

    int uk=0;
    for(auto & u:mp)
    {
        uk++;
        u.second=uk;
    }

    for(int i=1;i<=n;i++)
    {
        l[i]=mp[l[i]];
        r[i]=mp[r[i]];
    }
}

int lca[20][MX];
void fun(int a,int b)
{
    if(a==b)
    {
        cout<<"0\n";
        return;
    }

    if(l[b]<=r[a] && r[a]<=r[b])
    {
        cout<<"1\n";
        return;
    }

    if(r[b]<r[a] || r[a]<l[lca[19][b]])
    {
        cout<<"impossible\n";
        return;
    }

    int ans=2;
    for(int i=19;i>=0;i--)
    {
        if(r[a]<l[lca[i][b]])
        {
            b=lca[i][b];
            ans+=(1<<i);
        }
    }

    cout<<ans<<"\n";
}

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

    cin>>n>>k;

    for(int i=1;i<=n;i++)
    {
        cin>>l[i]>>r[i];
    }
    compr();

    fill(tree+1,tree+4*MX,make_pair(INF,0));
    for(int i=1;i<=n;i++)
    {
        upd(1,1,2*n,r[i],make_pair(l[i],i));
    }

    for(int i=1;i<=n;i++)
    {
        lca[0][i]=fget(1,1,2*n,l[i],r[i]).second;
    }
    for(int i=1;i<20;i++)
    {
        for(int j=1;j<=n;j++)
        {
            lca[i][j]=lca[i-1][lca[i-1][j]];
        }
    }

    for(int i=1;i<=k;i++)
    {
        int a,b;
        cin>>a>>b;

        fun(a,b);
    }

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 23644 KB Output is correct
2 Correct 134 ms 32156 KB Output is correct
3 Correct 145 ms 32280 KB Output is correct
4 Correct 153 ms 32324 KB Output is correct
5 Correct 155 ms 33004 KB Output is correct
6 Correct 147 ms 33196 KB Output is correct
7 Correct 153 ms 33424 KB Output is correct
8 Correct 153 ms 37348 KB Output is correct
9 Correct 143 ms 37356 KB Output is correct
10 Correct 140 ms 32596 KB Output is correct
11 Correct 144 ms 34588 KB Output is correct
12 Correct 84 ms 31824 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 23640 KB Output is correct
2 Correct 4 ms 23644 KB Output is correct
3 Correct 4 ms 23640 KB Output is correct
4 Correct 5 ms 23644 KB Output is correct
5 Correct 4 ms 23644 KB Output is correct
6 Correct 5 ms 23896 KB Output is correct
7 Correct 4 ms 23644 KB Output is correct
8 Correct 4 ms 23772 KB Output is correct
9 Correct 4 ms 23644 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 23640 KB Output is correct
2 Correct 4 ms 23644 KB Output is correct
3 Correct 4 ms 23640 KB Output is correct
4 Correct 5 ms 23644 KB Output is correct
5 Correct 4 ms 23644 KB Output is correct
6 Correct 5 ms 23896 KB Output is correct
7 Correct 4 ms 23644 KB Output is correct
8 Correct 4 ms 23772 KB Output is correct
9 Correct 4 ms 23644 KB Output is correct
10 Correct 4 ms 23644 KB Output is correct
11 Correct 4 ms 23640 KB Output is correct
12 Correct 5 ms 23644 KB Output is correct
13 Correct 5 ms 23644 KB Output is correct
14 Correct 4 ms 23644 KB Output is correct
15 Correct 4 ms 23640 KB Output is correct
16 Correct 4 ms 23644 KB Output is correct
17 Correct 4 ms 23872 KB Output is correct
18 Correct 4 ms 23644 KB Output is correct
19 Correct 30 ms 25560 KB Output is correct
20 Correct 28 ms 25724 KB Output is correct
21 Correct 36 ms 25740 KB Output is correct
22 Correct 23 ms 25680 KB Output is correct
23 Correct 24 ms 25692 KB Output is correct
24 Correct 22 ms 25948 KB Output is correct
25 Correct 27 ms 25436 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 23640 KB Output is correct
2 Correct 4 ms 23644 KB Output is correct
3 Correct 4 ms 23640 KB Output is correct
4 Correct 5 ms 23644 KB Output is correct
5 Correct 4 ms 23644 KB Output is correct
6 Correct 5 ms 23896 KB Output is correct
7 Correct 4 ms 23644 KB Output is correct
8 Correct 4 ms 23772 KB Output is correct
9 Correct 4 ms 23644 KB Output is correct
10 Correct 4 ms 23952 KB Output is correct
11 Correct 3 ms 23644 KB Output is correct
12 Correct 5 ms 23640 KB Output is correct
13 Correct 4 ms 23644 KB Output is correct
14 Correct 4 ms 23644 KB Output is correct
15 Correct 4 ms 23644 KB Output is correct
16 Correct 5 ms 23788 KB Output is correct
17 Correct 4 ms 23644 KB Output is correct
18 Correct 4 ms 23644 KB Output is correct
19 Correct 114 ms 30548 KB Output is correct
20 Correct 115 ms 29596 KB Output is correct
21 Correct 129 ms 30300 KB Output is correct
22 Correct 125 ms 32124 KB Output is correct
23 Correct 162 ms 35052 KB Output is correct
24 Correct 154 ms 35248 KB Output is correct
25 Correct 36 ms 25168 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 142 ms 29108 KB Output is correct
2 Correct 144 ms 29092 KB Output is correct
3 Correct 153 ms 29012 KB Output is correct
4 Correct 142 ms 34424 KB Output is correct
5 Correct 152 ms 32652 KB Output is correct
6 Correct 183 ms 36944 KB Output is correct
7 Correct 181 ms 36952 KB Output is correct
8 Correct 193 ms 37164 KB Output is correct
9 Correct 146 ms 35084 KB Output is correct
10 Correct 186 ms 36648 KB Output is correct
11 Correct 190 ms 36660 KB Output is correct
12 Correct 179 ms 36612 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 23644 KB Output is correct
2 Correct 134 ms 32156 KB Output is correct
3 Correct 145 ms 32280 KB Output is correct
4 Correct 153 ms 32324 KB Output is correct
5 Correct 155 ms 33004 KB Output is correct
6 Correct 147 ms 33196 KB Output is correct
7 Correct 153 ms 33424 KB Output is correct
8 Correct 153 ms 37348 KB Output is correct
9 Correct 143 ms 37356 KB Output is correct
10 Correct 140 ms 32596 KB Output is correct
11 Correct 144 ms 34588 KB Output is correct
12 Correct 84 ms 31824 KB Output is correct
13 Correct 4 ms 23640 KB Output is correct
14 Correct 4 ms 23644 KB Output is correct
15 Correct 4 ms 23640 KB Output is correct
16 Correct 5 ms 23644 KB Output is correct
17 Correct 4 ms 23644 KB Output is correct
18 Correct 5 ms 23896 KB Output is correct
19 Correct 4 ms 23644 KB Output is correct
20 Correct 4 ms 23772 KB Output is correct
21 Correct 4 ms 23644 KB Output is correct
22 Correct 4 ms 23644 KB Output is correct
23 Correct 4 ms 23640 KB Output is correct
24 Correct 5 ms 23644 KB Output is correct
25 Correct 5 ms 23644 KB Output is correct
26 Correct 4 ms 23644 KB Output is correct
27 Correct 4 ms 23640 KB Output is correct
28 Correct 4 ms 23644 KB Output is correct
29 Correct 4 ms 23872 KB Output is correct
30 Correct 4 ms 23644 KB Output is correct
31 Correct 30 ms 25560 KB Output is correct
32 Correct 28 ms 25724 KB Output is correct
33 Correct 36 ms 25740 KB Output is correct
34 Correct 23 ms 25680 KB Output is correct
35 Correct 24 ms 25692 KB Output is correct
36 Correct 22 ms 25948 KB Output is correct
37 Correct 27 ms 25436 KB Output is correct
38 Correct 4 ms 23952 KB Output is correct
39 Correct 3 ms 23644 KB Output is correct
40 Correct 5 ms 23640 KB Output is correct
41 Correct 4 ms 23644 KB Output is correct
42 Correct 4 ms 23644 KB Output is correct
43 Correct 4 ms 23644 KB Output is correct
44 Correct 5 ms 23788 KB Output is correct
45 Correct 4 ms 23644 KB Output is correct
46 Correct 4 ms 23644 KB Output is correct
47 Correct 114 ms 30548 KB Output is correct
48 Correct 115 ms 29596 KB Output is correct
49 Correct 129 ms 30300 KB Output is correct
50 Correct 125 ms 32124 KB Output is correct
51 Correct 162 ms 35052 KB Output is correct
52 Correct 154 ms 35248 KB Output is correct
53 Correct 36 ms 25168 KB Output is correct
54 Correct 142 ms 29108 KB Output is correct
55 Correct 144 ms 29092 KB Output is correct
56 Correct 153 ms 29012 KB Output is correct
57 Correct 142 ms 34424 KB Output is correct
58 Correct 152 ms 32652 KB Output is correct
59 Correct 183 ms 36944 KB Output is correct
60 Correct 181 ms 36952 KB Output is correct
61 Correct 193 ms 37164 KB Output is correct
62 Correct 146 ms 35084 KB Output is correct
63 Correct 186 ms 36648 KB Output is correct
64 Correct 190 ms 36660 KB Output is correct
65 Correct 179 ms 36612 KB Output is correct
66 Correct 4 ms 23640 KB Output is correct
67 Correct 133 ms 32340 KB Output is correct
68 Correct 148 ms 32340 KB Output is correct
69 Correct 151 ms 32276 KB Output is correct
70 Correct 151 ms 32600 KB Output is correct
71 Correct 170 ms 33092 KB Output is correct
72 Correct 145 ms 33360 KB Output is correct
73 Correct 151 ms 37304 KB Output is correct
74 Correct 156 ms 37356 KB Output is correct
75 Correct 141 ms 32596 KB Output is correct
76 Correct 148 ms 34424 KB Output is correct
77 Correct 88 ms 31888 KB Output is correct
78 Correct 3 ms 23644 KB Output is correct
79 Correct 4 ms 23644 KB Output is correct
80 Correct 4 ms 23640 KB Output is correct
81 Correct 4 ms 23644 KB Output is correct
82 Correct 4 ms 23832 KB Output is correct
83 Correct 5 ms 23644 KB Output is correct
84 Correct 5 ms 23644 KB Output is correct
85 Correct 4 ms 23644 KB Output is correct
86 Correct 31 ms 25540 KB Output is correct
87 Correct 27 ms 25424 KB Output is correct
88 Correct 30 ms 25728 KB Output is correct
89 Correct 22 ms 25692 KB Output is correct
90 Correct 24 ms 25956 KB Output is correct
91 Correct 22 ms 25756 KB Output is correct
92 Correct 26 ms 25436 KB Output is correct
93 Correct 118 ms 30804 KB Output is correct
94 Correct 111 ms 29776 KB Output is correct
95 Correct 129 ms 30292 KB Output is correct
96 Correct 135 ms 32104 KB Output is correct
97 Correct 159 ms 35236 KB Output is correct
98 Correct 155 ms 35232 KB Output is correct
99 Correct 37 ms 25172 KB Output is correct
100 Correct 179 ms 37068 KB Output is correct
101 Correct 192 ms 37216 KB Output is correct
102 Correct 186 ms 37200 KB Output is correct
103 Correct 192 ms 36812 KB Output is correct
104 Correct 198 ms 36480 KB Output is correct
105 Correct 183 ms 36592 KB Output is correct
106 Correct 142 ms 30800 KB Output is correct
107 Correct 146 ms 31572 KB Output is correct
108 Correct 151 ms 32340 KB Output is correct
109 Correct 155 ms 32336 KB Output is correct
110 Correct 196 ms 36840 KB Output is correct
111 Correct 240 ms 36956 KB Output is correct