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Submission #921096

# Submission time Handle Problem Language Result Execution time Memory
921096 2024-02-03T10:05:01 Z Pacybwoah Event Hopping (BOI22_events) C++17
100 / 100
 414 ms 13280 KB 
#include<iostream>
#include<vector>
#include<algorithm>
#include<utility>
using namespace std;
struct event{
    int start,end,pos;
};
bool cmp(event a,event b){
    if(a.end==b.end) return a.start<b.start;
    return a.end<b.end;
}
struct st{
vector<pair<int,int> > seg;
st(vector<int> &vec,int n){
    seg.resize(4*n+4);
    build(1,n,1,vec);
}
void build(int l,int r,int ind,vector<int> &vec){
    if(l==r){
        if(vec[l-1]==-1) seg[ind]=make_pair(1e9+1,l-1);
        else seg[ind]=make_pair(vec[l-1],l-1);
        return;
    }
    int mid=(l+r)>>1;
    build(l,mid,ind*2,vec);
    build(mid+1,r,ind*2+1,vec);
    seg[ind]=min(seg[ind*2],seg[ind*2+1]);
}
pair<int,int> query(int l,int r,int start,int end,int ind){
    if(r<start||end<l) return make_pair(1e9+1,1e9+1);
    if(start<=l&&r<=end) return seg[ind];
    int mid=(l+r)>>1;
    return min(query(l,mid,start,end,ind*2),query(mid+1,r,start,end,ind*2+1));
}};
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n,q;
    cin>>n>>q;
    vector<event> vec(n);
    int a,b;
    for(int i=0;i<n;i++){
        cin>>a>>b;
        vec[i].start=a;
        vec[i].end=b;
        vec[i].pos=i;
    }
    vector<int> ori(n+1);
    sort(vec.begin(),vec.end(),cmp);
    for(int i=0;i<n;i++) ori[vec[i].pos+1]=i;
    vector<vector<int> > anc(17,vector<int>(n));
    anc[0][0]=-1;
    //for(int i=0;i<n;i++) cout<<"\n"<<vec[i].start<<" "<<vec[i].end;
    for(int i=1;i<n;i++){
        if(vec[i-1].end<vec[i].start){
            anc[0][i]=-1;
            continue;
        }
        int l=0,r=i-1;
        while(l<r){
            int mid=(l+r)>>1;
            if(vec[mid].end<vec[i].start){
                l=mid+1;
            }
            else{
                r=mid;
            }
        }
        anc[0][i]=l;
    } 
    vector<int> bruv(n);
    for(int i=0;i<n;i++) bruv[i]=vec[i].start;
    st omg(bruv,n);
    for(int i=1;i<17;i++){
        for(int j=0;j<n;j++){
            if(anc[i-1][j]==-1) {
                anc[i][j]=-1;
                continue;
            }
            int tmp=omg.query(1,n,anc[i-1][j]+1,j+1,1).second;
            if(tmp==1e9+1) anc[i][j]=-1;
            else anc[i][j]=anc[i-1][tmp];
        }
    }
    /*for(int i=0;i<17;i++){
        for(int j=0;j<n;j++){
            cout<<anc[i][j]<<" ";
        }
        cout<<"\n";
    }*/
    for(int i=0;i<q;i++){
        cin>>a>>b;
        if(a==b){
            cout<<"0\n";
            continue;
        }
        a=ori[a],b=ori[b];
        if(vec[a].end==vec[b].end){
            cout<<"1\n";
            continue;
        }
        if(a>b){
            cout<<"impossible\n";
            continue;
        }
        int ans=0;
        for(int j=16;j>=0;j--){
            if(anc[j][b]>a&&anc[j][b]!=-1) b=omg.query(1,n,anc[j][b]+1,b+1,1).second,ans+=(1<<j);
        }
        if(anc[0][b]<=a&&anc[0][b]!=-1){
            cout<<ans+1<<"\n";
        }
        else cout<<"impossible\n";
    }
}
 
/*1 3
2 4
3 7
4 7
7 9*/

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 343 ms 12740 KB Output is correct
3 Correct 407 ms 12744 KB Output is correct
4 Correct 405 ms 12732 KB Output is correct
5 Correct 382 ms 12748 KB Output is correct
6 Correct 347 ms 12744 KB Output is correct
7 Correct 335 ms 12728 KB Output is correct
8 Correct 52 ms 13260 KB Output is correct
9 Correct 48 ms 13260 KB Output is correct
10 Correct 329 ms 12984 KB Output is correct
11 Correct 245 ms 12992 KB Output is correct
12 Correct 56 ms 13280 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 2 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 2 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 2 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 2 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 2 ms 600 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 81 ms 1500 KB Output is correct
20 Correct 105 ms 1372 KB Output is correct
21 Correct 73 ms 1620 KB Output is correct
22 Correct 24 ms 1820 KB Output is correct
23 Correct 29 ms 1584 KB Output is correct
24 Correct 19 ms 1624 KB Output is correct
25 Correct 52 ms 1116 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 2 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 2 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 360 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 1 ms 600 KB Output is correct
14 Correct 2 ms 344 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 2 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 247 ms 12420 KB Output is correct
20 Correct 236 ms 12212 KB Output is correct
21 Correct 56 ms 12204 KB Output is correct
22 Correct 166 ms 12132 KB Output is correct
23 Correct 41 ms 12132 KB Output is correct
24 Correct 149 ms 12000 KB Output is correct
25 Correct 32 ms 11988 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 344 ms 12568 KB Output is correct
2 Correct 383 ms 12732 KB Output is correct
3 Correct 411 ms 12624 KB Output is correct
4 Correct 47 ms 13272 KB Output is correct
5 Correct 324 ms 12984 KB Output is correct
6 Correct 315 ms 12748 KB Output is correct
7 Correct 253 ms 12728 KB Output is correct
8 Correct 241 ms 13060 KB Output is correct
9 Correct 40 ms 12072 KB Output is correct
10 Correct 267 ms 12472 KB Output is correct
11 Correct 131 ms 12412 KB Output is correct
12 Correct 282 ms 12492 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 343 ms 12740 KB Output is correct
3 Correct 407 ms 12744 KB Output is correct
4 Correct 405 ms 12732 KB Output is correct
5 Correct 382 ms 12748 KB Output is correct
6 Correct 347 ms 12744 KB Output is correct
7 Correct 335 ms 12728 KB Output is correct
8 Correct 52 ms 13260 KB Output is correct
9 Correct 48 ms 13260 KB Output is correct
10 Correct 329 ms 12984 KB Output is correct
11 Correct 245 ms 12992 KB Output is correct
12 Correct 56 ms 13280 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 2 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 2 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 2 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 2 ms 600 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 81 ms 1500 KB Output is correct
32 Correct 105 ms 1372 KB Output is correct
33 Correct 73 ms 1620 KB Output is correct
34 Correct 24 ms 1820 KB Output is correct
35 Correct 29 ms 1584 KB Output is correct
36 Correct 19 ms 1624 KB Output is correct
37 Correct 52 ms 1116 KB Output is correct
38 Correct 1 ms 344 KB Output is correct
39 Correct 0 ms 360 KB Output is correct
40 Correct 2 ms 348 KB Output is correct
41 Correct 1 ms 600 KB Output is correct
42 Correct 2 ms 344 KB Output is correct
43 Correct 1 ms 344 KB Output is correct
44 Correct 2 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 1 ms 348 KB Output is correct
47 Correct 247 ms 12420 KB Output is correct
48 Correct 236 ms 12212 KB Output is correct
49 Correct 56 ms 12204 KB Output is correct
50 Correct 166 ms 12132 KB Output is correct
51 Correct 41 ms 12132 KB Output is correct
52 Correct 149 ms 12000 KB Output is correct
53 Correct 32 ms 11988 KB Output is correct
54 Correct 344 ms 12568 KB Output is correct
55 Correct 383 ms 12732 KB Output is correct
56 Correct 411 ms 12624 KB Output is correct
57 Correct 47 ms 13272 KB Output is correct
58 Correct 324 ms 12984 KB Output is correct
59 Correct 315 ms 12748 KB Output is correct
60 Correct 253 ms 12728 KB Output is correct
61 Correct 241 ms 13060 KB Output is correct
62 Correct 40 ms 12072 KB Output is correct
63 Correct 267 ms 12472 KB Output is correct
64 Correct 131 ms 12412 KB Output is correct
65 Correct 282 ms 12492 KB Output is correct
66 Correct 0 ms 344 KB Output is correct
67 Correct 340 ms 12748 KB Output is correct
68 Correct 384 ms 12732 KB Output is correct
69 Correct 414 ms 13236 KB Output is correct
70 Correct 382 ms 12724 KB Output is correct
71 Correct 350 ms 12888 KB Output is correct
72 Correct 340 ms 12776 KB Output is correct
73 Correct 50 ms 13260 KB Output is correct
74 Correct 63 ms 13260 KB Output is correct
75 Correct 328 ms 13100 KB Output is correct
76 Correct 237 ms 12988 KB Output is correct
77 Correct 47 ms 13256 KB Output is correct
78 Correct 0 ms 344 KB Output is correct
79 Correct 2 ms 348 KB Output is correct
80 Correct 1 ms 344 KB Output is correct
81 Correct 2 ms 348 KB Output is correct
82 Correct 1 ms 348 KB Output is correct
83 Correct 2 ms 348 KB Output is correct
84 Correct 1 ms 348 KB Output is correct
85 Correct 1 ms 348 KB Output is correct
86 Correct 84 ms 1312 KB Output is correct
87 Correct 99 ms 1364 KB Output is correct
88 Correct 70 ms 1560 KB Output is correct
89 Correct 24 ms 1628 KB Output is correct
90 Correct 29 ms 1496 KB Output is correct
91 Correct 19 ms 1860 KB Output is correct
92 Correct 52 ms 1112 KB Output is correct
93 Correct 241 ms 11976 KB Output is correct
94 Correct 236 ms 12212 KB Output is correct
95 Correct 57 ms 11976 KB Output is correct
96 Correct 162 ms 12116 KB Output is correct
97 Correct 42 ms 11976 KB Output is correct
98 Correct 149 ms 12212 KB Output is correct
99 Correct 40 ms 12000 KB Output is correct
100 Correct 304 ms 12728 KB Output is correct
101 Correct 252 ms 12724 KB Output is correct
102 Correct 216 ms 13048 KB Output is correct
103 Correct 266 ms 12492 KB Output is correct
104 Correct 134 ms 12236 KB Output is correct
105 Correct 282 ms 12588 KB Output is correct
106 Correct 269 ms 12728 KB Output is correct
107 Correct 396 ms 12984 KB Output is correct
108 Correct 86 ms 13000 KB Output is correct
109 Correct 85 ms 13004 KB Output is correct
110 Correct 251 ms 12724 KB Output is correct
111 Correct 246 ms 12728 KB Output is correct