oj.uz

Submission #850090

# Submission time Handle Problem Language Result Execution time Memory
850090 2023-09-15T17:45:52 Z Ahmed57 Event Hopping (BOI22_events) C++17
100 / 100
 471 ms 38908 KB 
#include <bits/stdc++.h>
using namespace std;
bool cmp(pair<pair<int,int>,int> a,pair<pair<int,int>,int> b){
    return a.first.second<b.first.second;
}
int P[100001][17],ind[100001];
pair<long long,long long> seg[800001];
void build(int p,int l,int r){
    if(l==r){
        seg[p] = {1e18,-1};
        return ;
    }
    int md = (l+r)/2;
    build(p*2,l,md);build(p*2+1,md+1,r);
    seg[p] = min(seg[p*2],seg[p*2+1]);
}
pair<long long,long long> query(int p,int l,int r,int lq,int rq){
    if(l>=lq&&r<=rq)return seg[p];
    if(r<lq||l>rq)return {1e18,-1};
    int md = (l+r)/2;
    return min(query(p*2,l,md,lq,rq),query(p*2+1,md+1,r,lq,rq));
}
void update(int p,int l,int r,int idx,pair<long long,long long> val){
    if(l==r){
        seg[p] = min(seg[p],val);
        return ;
    }
    int md = (l+r)/2;
    if(idx<=md)update(p*2,l,md,idx,val);
    else update(p*2+1,md+1,r,idx,val);
    seg[p] = min(seg[p*2],seg[p*2+1]);
}
signed main(){
    int n,q;cin>>n>>q;
    vector<pair<pair<long long,long long>,int>> v;
    map<int,int> comp,sav;
    for(int i = 0;i<n;i++){
        int a,b;
        cin>>a>>b;
        comp[a]++;comp[b]++;
        v.push_back({{a,b},i});
    }
    long long z = 0;
    for(auto i:comp){
        sav[i.first] = ++z;
    }
    for(int i = 0;i<n;i++){
        v[i].first.first = sav[v[i].first.first];
        v[i].first.second = sav[v[i].first.second];
    }
    sort(v.begin(),v.end());
    build(1,0,z);
    for(long long i = 0;i<v.size();i++){
        update(1,0,z,v[i].first.second,{v[i].first.first,i});
    }
    int in = 0;
    for(int i = 0;i<v.size();i++){
        ind[v[i].second] = i;
        P[i][0] = query(1,0,z,v[i].first.first,v[i].first.second).second;
        //cout<<P[i][0]<<" "<<v[i].first.first<<" "<<v[i].first.second<<endl;
    }
    for(int i = 0;i<n;i++){
        for(int j = 1;j<17;j++){
            P[i][j] = P[P[i][j-1]][j-1];
        }
    }
    while(q--){
        int a,b;cin>>a>>b;
        a--;b--;a = ind[a] , b = ind[b];
        if(a==b){
        cout<<0<<endl;
        continue;
        }else if(v[b].first.first<=v[a].first.second&&v[a].first.second<=v[b].first.second){
        cout<<1<<endl;
        continue;
        }
        int sum = 1 , cur = b;
        //cout<<cur<<endl;
        for(int i = 16;i>=0;i--){
            if(v[P[cur][i]].first.first>v[a].first.second){
                sum+=(1<<i);
                cur = P[cur][i];
            }
        }
        if(v[P[cur][0]].first.first<=v[a].first.second&&v[P[cur][0]].first.second>=v[a].first.second){
            cout<<sum+1<<endl;
        }else cout<<"impossible\n";
    }
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:53:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<std::pair<long long int, long long int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |     for(long long i = 0;i<v.size();i++){
      |                         ~^~~~~~~~~
events.cpp:57:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<long long int, long long int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for(int i = 0;i<v.size();i++){
      |                   ~^~~~~~~~~
events.cpp:56:9: warning: unused variable 'in' [-Wunused-variable]
   56 |     int in = 0;
      |         ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 344 ms 24108 KB Output is correct
3 Correct 341 ms 24100 KB Output is correct
4 Correct 347 ms 24060 KB Output is correct
5 Correct 355 ms 25020 KB Output is correct
6 Correct 355 ms 26120 KB Output is correct
7 Correct 348 ms 26364 KB Output is correct
8 Correct 388 ms 37884 KB Output is correct
9 Correct 379 ms 38008 KB Output is correct
10 Correct 347 ms 24632 KB Output is correct
11 Correct 380 ms 32764 KB Output is correct
12 Correct 273 ms 24736 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2392 KB Output is correct
5 Correct 2 ms 2392 KB Output is correct
6 Correct 2 ms 2648 KB Output is correct
7 Correct 2 ms 2648 KB Output is correct
8 Correct 2 ms 2648 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2392 KB Output is correct
5 Correct 2 ms 2392 KB Output is correct
6 Correct 2 ms 2648 KB Output is correct
7 Correct 2 ms 2648 KB Output is correct
8 Correct 2 ms 2648 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 0 ms 2392 KB Output is correct
12 Correct 2 ms 2392 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 2 ms 2392 KB Output is correct
15 Correct 2 ms 2392 KB Output is correct
16 Correct 2 ms 2648 KB Output is correct
17 Correct 2 ms 2648 KB Output is correct
18 Correct 2 ms 2648 KB Output is correct
19 Correct 164 ms 5712 KB Output is correct
20 Correct 168 ms 5612 KB Output is correct
21 Correct 164 ms 5964 KB Output is correct
22 Correct 160 ms 6228 KB Output is correct
23 Correct 161 ms 6224 KB Output is correct
24 Correct 161 ms 6252 KB Output is correct
25 Correct 161 ms 5968 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2392 KB Output is correct
5 Correct 2 ms 2392 KB Output is correct
6 Correct 2 ms 2648 KB Output is correct
7 Correct 2 ms 2648 KB Output is correct
8 Correct 2 ms 2648 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 0 ms 2392 KB Output is correct
12 Correct 2 ms 2648 KB Output is correct
13 Correct 2 ms 2392 KB Output is correct
14 Correct 2 ms 2392 KB Output is correct
15 Correct 2 ms 2648 KB Output is correct
16 Correct 2 ms 2648 KB Output is correct
17 Correct 2 ms 2648 KB Output is correct
18 Correct 1 ms 2392 KB Output is correct
19 Correct 174 ms 23296 KB Output is correct
20 Correct 158 ms 23436 KB Output is correct
21 Correct 191 ms 23292 KB Output is correct
22 Correct 199 ms 30968 KB Output is correct
23 Correct 250 ms 36860 KB Output is correct
24 Correct 244 ms 36852 KB Output is correct
25 Correct 52 ms 10172 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 336 ms 24060 KB Output is correct
2 Correct 342 ms 24152 KB Output is correct
3 Correct 344 ms 24572 KB Output is correct
4 Correct 368 ms 38396 KB Output is correct
5 Correct 357 ms 24352 KB Output is correct
6 Correct 471 ms 37880 KB Output is correct
7 Correct 417 ms 37884 KB Output is correct
8 Correct 416 ms 37880 KB Output is correct
9 Correct 247 ms 37116 KB Output is correct
10 Correct 401 ms 37500 KB Output is correct
11 Correct 424 ms 37336 KB Output is correct
12 Correct 402 ms 37368 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 344 ms 24108 KB Output is correct
3 Correct 341 ms 24100 KB Output is correct
4 Correct 347 ms 24060 KB Output is correct
5 Correct 355 ms 25020 KB Output is correct
6 Correct 355 ms 26120 KB Output is correct
7 Correct 348 ms 26364 KB Output is correct
8 Correct 388 ms 37884 KB Output is correct
9 Correct 379 ms 38008 KB Output is correct
10 Correct 347 ms 24632 KB Output is correct
11 Correct 380 ms 32764 KB Output is correct
12 Correct 273 ms 24736 KB Output is correct
13 Correct 1 ms 2392 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 2 ms 2396 KB Output is correct
16 Correct 2 ms 2392 KB Output is correct
17 Correct 2 ms 2392 KB Output is correct
18 Correct 2 ms 2648 KB Output is correct
19 Correct 2 ms 2648 KB Output is correct
20 Correct 2 ms 2648 KB Output is correct
21 Correct 1 ms 2392 KB Output is correct
22 Correct 1 ms 2396 KB Output is correct
23 Correct 0 ms 2392 KB Output is correct
24 Correct 2 ms 2392 KB Output is correct
25 Correct 2 ms 2396 KB Output is correct
26 Correct 2 ms 2392 KB Output is correct
27 Correct 2 ms 2392 KB Output is correct
28 Correct 2 ms 2648 KB Output is correct
29 Correct 2 ms 2648 KB Output is correct
30 Correct 2 ms 2648 KB Output is correct
31 Correct 164 ms 5712 KB Output is correct
32 Correct 168 ms 5612 KB Output is correct
33 Correct 164 ms 5964 KB Output is correct
34 Correct 160 ms 6228 KB Output is correct
35 Correct 161 ms 6224 KB Output is correct
36 Correct 161 ms 6252 KB Output is correct
37 Correct 161 ms 5968 KB Output is correct
38 Correct 1 ms 2392 KB Output is correct
39 Correct 0 ms 2392 KB Output is correct
40 Correct 2 ms 2648 KB Output is correct
41 Correct 2 ms 2392 KB Output is correct
42 Correct 2 ms 2392 KB Output is correct
43 Correct 2 ms 2648 KB Output is correct
44 Correct 2 ms 2648 KB Output is correct
45 Correct 2 ms 2648 KB Output is correct
46 Correct 1 ms 2392 KB Output is correct
47 Correct 174 ms 23296 KB Output is correct
48 Correct 158 ms 23436 KB Output is correct
49 Correct 191 ms 23292 KB Output is correct
50 Correct 199 ms 30968 KB Output is correct
51 Correct 250 ms 36860 KB Output is correct
52 Correct 244 ms 36852 KB Output is correct
53 Correct 52 ms 10172 KB Output is correct
54 Correct 336 ms 24060 KB Output is correct
55 Correct 342 ms 24152 KB Output is correct
56 Correct 344 ms 24572 KB Output is correct
57 Correct 368 ms 38396 KB Output is correct
58 Correct 357 ms 24352 KB Output is correct
59 Correct 471 ms 37880 KB Output is correct
60 Correct 417 ms 37884 KB Output is correct
61 Correct 416 ms 37880 KB Output is correct
62 Correct 247 ms 37116 KB Output is correct
63 Correct 401 ms 37500 KB Output is correct
64 Correct 424 ms 37336 KB Output is correct
65 Correct 402 ms 37368 KB Output is correct
66 Correct 1 ms 2392 KB Output is correct
67 Correct 333 ms 24080 KB Output is correct
68 Correct 344 ms 24984 KB Output is correct
69 Correct 343 ms 24060 KB Output is correct
70 Correct 355 ms 25224 KB Output is correct
71 Correct 345 ms 25852 KB Output is correct
72 Correct 358 ms 26836 KB Output is correct
73 Correct 387 ms 38908 KB Output is correct
74 Correct 370 ms 38652 KB Output is correct
75 Correct 338 ms 25084 KB Output is correct
76 Correct 359 ms 32508 KB Output is correct
77 Correct 273 ms 24572 KB Output is correct
78 Correct 1 ms 2392 KB Output is correct
79 Correct 2 ms 2392 KB Output is correct
80 Correct 2 ms 2392 KB Output is correct
81 Correct 2 ms 2392 KB Output is correct
82 Correct 2 ms 2796 KB Output is correct
83 Correct 2 ms 2652 KB Output is correct
84 Correct 3 ms 2648 KB Output is correct
85 Correct 2 ms 2392 KB Output is correct
86 Correct 180 ms 5712 KB Output is correct
87 Correct 159 ms 5660 KB Output is correct
88 Correct 166 ms 5968 KB Output is correct
89 Correct 159 ms 6032 KB Output is correct
90 Correct 162 ms 6360 KB Output is correct
91 Correct 176 ms 6440 KB Output is correct
92 Correct 161 ms 5968 KB Output is correct
93 Correct 177 ms 23288 KB Output is correct
94 Correct 162 ms 23432 KB Output is correct
95 Correct 189 ms 23376 KB Output is correct
96 Correct 196 ms 30968 KB Output is correct
97 Correct 247 ms 37116 KB Output is correct
98 Correct 286 ms 37172 KB Output is correct
99 Correct 52 ms 9920 KB Output is correct
100 Correct 410 ms 37896 KB Output is correct
101 Correct 420 ms 37632 KB Output is correct
102 Correct 406 ms 37852 KB Output is correct
103 Correct 405 ms 37188 KB Output is correct
104 Correct 435 ms 37112 KB Output is correct
105 Correct 403 ms 37344 KB Output is correct
106 Correct 334 ms 22336 KB Output is correct
107 Correct 349 ms 24312 KB Output is correct
108 Correct 362 ms 24316 KB Output is correct
109 Correct 357 ms 24712 KB Output is correct
110 Correct 460 ms 37836 KB Output is correct
111 Correct 442 ms 37624 KB Output is correct