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Submission #599506

# Submission time Handle Problem Language Result Execution time Memory
599506 2022-07-19T14:45:10 Z alexander707070 Event Hopping (BOI22_events) C++14
100 / 100
 373 ms 31020 KB 
#include<bits/stdc++.h>
#define MAXN 400007
using namespace std;
 
struct event{
    int s;
    int e;
    int id;
 
    inline friend bool operator < (event fr,event sc){
        if(fr.e!=sc.e)return fr.e<sc.e;
        return fr.s<sc.s;
    }
};
 
int n,cnt,q,S,E,ans;
int st[MAXN],et[MAXN];
int pos[MAXN],parent[MAXN];
event e[MAXN];
vector<int> w;
map<int,int> mp;
 
pair<int,int> mins[8*MAXN];
 
pair<int,int> best(pair<int,int> fr,pair<int,int> sc){
    if(fr.second<=sc.second)return fr;
    return sc;
}
 
void update(int v,int l,int r,int pos,int val,int id){
    if(l==r){
        if(val<mins[v].second or val==10000000){
            mins[v]={id,val};
        }
    }else{
        int tt=(l+r)/2;
        if(pos<=tt)update(2*v,l,tt,pos,val,id);
        else update(2*v+1,tt+1,r,pos,val,id);
        mins[v]=best(mins[2*v],mins[2*v+1]);
    }
}
 
pair<int,int> getmin(int v,int l,int r,int ll,int rr){
    if(ll>rr)return {0,100000000};
    if(l==ll and r==rr){
        return mins[v];
    }else{
        int tt=(l+r)/2;
        return best( getmin(2*v,l,tt,ll,min(tt,rr)) , getmin(2*v+1,tt+1,r,max(tt+1,ll),rr) );
    }
}
 
int dp[MAXN][20];
bool li[MAXN][20];
 
int ff(int x,int p){
    if(x==0)return 0;
    if(p==0)return parent[x];
 
    if(li[x][p])return dp[x][p];
    li[x][p]=true;
 
    dp[x][p]=ff(ff(x,p-1),p-1);
    return dp[x][p];
}
 
int bin(int id,int id2){
 
    if(id==id2)return 0;
    if(et[id]<st[id2])return -1;
    if(et[id2]>et[id])return -1;
    if(et[id2]>=st[id])return 1;
 
    int res=0;
    for(int i=19;i>=0;i--){
        if(ff(id,i)!=0 and st[ff(id,i)]>et[id2]){
            id=ff(id,i);
            res+=(1<<i);
        }
    }
 
    if(parent[id]==0)return -1;
    if(parent[id]==id2)return res+1;
    return res+2;
}
 
int main(){
 
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
 
    cin>>n>>q;
    for(int i=1;i<=n;i++){
        cin>>st[i]>>et[i];
        e[i]={st[i],et[i],i};
        w.push_back(e[i].s);
        w.push_back(e[i].e);
    }
 
    sort(w.begin(),w.end());
    for(int i=0;i<w.size();i++){
        if(i>0 and w[i]!=w[i-1])cnt++;
        mp[w[i]]=cnt;
    }
 
    for(int i=1;i<=n;i++){
        e[i].s=mp[e[i].s];
        e[i].e=mp[e[i].e];
        pos[e[i].id]=i;
    }
 
    for(int i=0;i<=cnt;i++){
        update(1,0,cnt,i,10000000,0);
    }
 
    sort(e+1,e+n+1);
    for(int i=1;i<=n;i++){
        parent[e[i].id]=getmin(1,0,cnt,e[i].s,e[i].e).first;
        update(1,0,cnt,e[i].e,e[i].s,e[i].id);
    }
 
    for(int i=1;i<=q;i++){
        cin>>S>>E;
        ans=bin(E,S);
        if(ans==-1)cout<<"impossible\n";
        else cout<<ans<<"\n";
    }
 
 
    return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:102:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |     for(int i=0;i<w.size();i++){
      |                 ~^~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 176 ms 21032 KB Output is correct
3 Correct 259 ms 20968 KB Output is correct
4 Correct 330 ms 21124 KB Output is correct
5 Correct 253 ms 21480 KB Output is correct
6 Correct 254 ms 21960 KB Output is correct
7 Correct 263 ms 22184 KB Output is correct
8 Correct 200 ms 21264 KB Output is correct
9 Correct 236 ms 21232 KB Output is correct
10 Correct 278 ms 21316 KB Output is correct
11 Correct 267 ms 25348 KB Output is correct
12 Correct 114 ms 11720 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 596 KB Output is correct
8 Correct 2 ms 468 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 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 596 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 2 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 2 ms 596 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 39 ms 1896 KB Output is correct
20 Correct 36 ms 1868 KB Output is correct
21 Correct 36 ms 2124 KB Output is correct
22 Correct 29 ms 2192 KB Output is correct
23 Correct 28 ms 2388 KB Output is correct
24 Correct 33 ms 1820 KB Output is correct
25 Correct 33 ms 2000 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 596 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 2 ms 596 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 178 ms 20384 KB Output is correct
20 Correct 168 ms 20380 KB Output is correct
21 Correct 147 ms 10864 KB Output is correct
22 Correct 157 ms 24192 KB Output is correct
23 Correct 229 ms 17304 KB Output is correct
24 Correct 206 ms 26340 KB Output is correct
25 Correct 25 ms 5220 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 202 ms 20936 KB Output is correct
2 Correct 257 ms 21012 KB Output is correct
3 Correct 316 ms 20920 KB Output is correct
4 Correct 207 ms 21168 KB Output is correct
5 Correct 282 ms 21444 KB Output is correct
6 Correct 373 ms 27916 KB Output is correct
7 Correct 316 ms 27900 KB Output is correct
8 Correct 250 ms 27952 KB Output is correct
9 Correct 236 ms 17304 KB Output is correct
10 Correct 250 ms 27528 KB Output is correct
11 Correct 238 ms 22116 KB Output is correct
12 Correct 265 ms 27560 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 176 ms 21032 KB Output is correct
3 Correct 259 ms 20968 KB Output is correct
4 Correct 330 ms 21124 KB Output is correct
5 Correct 253 ms 21480 KB Output is correct
6 Correct 254 ms 21960 KB Output is correct
7 Correct 263 ms 22184 KB Output is correct
8 Correct 200 ms 21264 KB Output is correct
9 Correct 236 ms 21232 KB Output is correct
10 Correct 278 ms 21316 KB Output is correct
11 Correct 267 ms 25348 KB Output is correct
12 Correct 114 ms 11720 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 2 ms 596 KB Output is correct
20 Correct 2 ms 468 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 0 ms 340 KB Output is correct
24 Correct 2 ms 468 KB Output is correct
25 Correct 2 ms 468 KB Output is correct
26 Correct 2 ms 468 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 2 ms 596 KB Output is correct
29 Correct 2 ms 468 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 39 ms 1896 KB Output is correct
32 Correct 36 ms 1868 KB Output is correct
33 Correct 36 ms 2124 KB Output is correct
34 Correct 29 ms 2192 KB Output is correct
35 Correct 28 ms 2388 KB Output is correct
36 Correct 33 ms 1820 KB Output is correct
37 Correct 33 ms 2000 KB Output is correct
38 Correct 0 ms 340 KB Output is correct
39 Correct 0 ms 340 KB Output is correct
40 Correct 1 ms 468 KB Output is correct
41 Correct 1 ms 468 KB Output is correct
42 Correct 1 ms 468 KB Output is correct
43 Correct 1 ms 468 KB Output is correct
44 Correct 2 ms 596 KB Output is correct
45 Correct 1 ms 468 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 178 ms 20384 KB Output is correct
48 Correct 168 ms 20380 KB Output is correct
49 Correct 147 ms 10864 KB Output is correct
50 Correct 157 ms 24192 KB Output is correct
51 Correct 229 ms 17304 KB Output is correct
52 Correct 206 ms 26340 KB Output is correct
53 Correct 25 ms 5220 KB Output is correct
54 Correct 202 ms 20936 KB Output is correct
55 Correct 257 ms 21012 KB Output is correct
56 Correct 316 ms 20920 KB Output is correct
57 Correct 207 ms 21168 KB Output is correct
58 Correct 282 ms 21444 KB Output is correct
59 Correct 373 ms 27916 KB Output is correct
60 Correct 316 ms 27900 KB Output is correct
61 Correct 250 ms 27952 KB Output is correct
62 Correct 236 ms 17304 KB Output is correct
63 Correct 250 ms 27528 KB Output is correct
64 Correct 238 ms 22116 KB Output is correct
65 Correct 265 ms 27560 KB Output is correct
66 Correct 0 ms 340 KB Output is correct
67 Correct 191 ms 24116 KB Output is correct
68 Correct 266 ms 24044 KB Output is correct
69 Correct 332 ms 23924 KB Output is correct
70 Correct 252 ms 24644 KB Output is correct
71 Correct 258 ms 24984 KB Output is correct
72 Correct 236 ms 25304 KB Output is correct
73 Correct 203 ms 24428 KB Output is correct
74 Correct 205 ms 24280 KB Output is correct
75 Correct 276 ms 24348 KB Output is correct
76 Correct 249 ms 28288 KB Output is correct
77 Correct 121 ms 14008 KB Output is correct
78 Correct 0 ms 340 KB Output is correct
79 Correct 2 ms 596 KB Output is correct
80 Correct 2 ms 504 KB Output is correct
81 Correct 2 ms 544 KB Output is correct
82 Correct 2 ms 468 KB Output is correct
83 Correct 2 ms 640 KB Output is correct
84 Correct 2 ms 468 KB Output is correct
85 Correct 1 ms 340 KB Output is correct
86 Correct 40 ms 2860 KB Output is correct
87 Correct 39 ms 2940 KB Output is correct
88 Correct 37 ms 3048 KB Output is correct
89 Correct 27 ms 3156 KB Output is correct
90 Correct 29 ms 3404 KB Output is correct
91 Correct 28 ms 2904 KB Output is correct
92 Correct 35 ms 2980 KB Output is correct
93 Correct 164 ms 22336 KB Output is correct
94 Correct 159 ms 21500 KB Output is correct
95 Correct 147 ms 12744 KB Output is correct
96 Correct 161 ms 26060 KB Output is correct
97 Correct 209 ms 19288 KB Output is correct
98 Correct 206 ms 26244 KB Output is correct
99 Correct 28 ms 5204 KB Output is correct
100 Correct 302 ms 30872 KB Output is correct
101 Correct 296 ms 30956 KB Output is correct
102 Correct 250 ms 31020 KB Output is correct
103 Correct 261 ms 30660 KB Output is correct
104 Correct 233 ms 24992 KB Output is correct
105 Correct 268 ms 30660 KB Output is correct
106 Correct 233 ms 22380 KB Output is correct
107 Correct 283 ms 23496 KB Output is correct
108 Correct 182 ms 23868 KB Output is correct
109 Correct 203 ms 24008 KB Output is correct
110 Correct 247 ms 30400 KB Output is correct
111 Correct 256 ms 30420 KB Output is correct