oj.uz

Submission #660091

# Submission time Handle Problem Language Result Execution time Memory
660091 2022-11-20T10:45:02 Z Karuk Event Hopping (BOI22_events) C++14
25 / 100
 1500 ms 198144 KB 
#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
const long long k=(1<<30);
map<long long,pair<long long,long long> >maxv;
void upd(long long x,long long va,long long ind) {
    pair<long long,long long>val={va,ind};
    while(x>0) {
        maxv[x]=max(maxv[x],val);
        x>>=1;
    }
}
pair<long long,long long> ask(long long from,long long to,long long cur=1,long long beg=0,long long en=k-1) {
    if(from<=beg && en<=to)return maxv[cur];
    if(to<beg || en<from)return {-1,-1};
    long long mid=(beg+en)/2;
    return max(ask(from,to,cur*2,beg,mid),ask(from,to,cur*2+1,mid+1,en));
}
int main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    long long n,q;cin>>n>>q;
    pair<long long,long long>a[n];
    for(long long i=0;i<n;i++) {
        long long x,y;
        cin>>x>>y;
        a[i]={x,y};
        upd(y+k,k-x,i);
    }
    pair<long long,long long> prev[n][25];
    for(long long i=0;i<n;i++) {
        pair<long long,long long>d=ask(a[i].first,a[i].second);
        d.first=k-d.first;
        prev[i][0]=d;
    }
    for(long long j=1;j<25;j++) {
        for(long long i=0;i<n;i++) {
            prev[i][j]=prev[prev[i][j-1].second][j-1];
        }
    }
    for(long long i=0;i<q;i++) {
        long long x,y;cin>>x>>y;x--;y--;
        if(x==y)cout<<0<<endl;
        else if(a[x].second>=a[y].first && a[x].second<=a[y].second)cout<<1<<endl;
        else if(a[x].second>a[y].second){cout<<"impossible"<<endl;}
        else {
            long long cnt=0;
            long long cur=y;
            long long en=a[x].second;
            for(long long j=24;j>=0;j--) {
                if(prev[cur][j].first>en) {
                    cur=prev[cur][j].second;
                    cnt+=(1<<j);
                }
            }
            if(prev[cur][0].first>en)cout<<"impossible"<<endl;
            else cout<<cnt+2<<endl;
        }
    }
    return 0;
}
///9:30

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1454 ms 185648 KB Output is correct
3 Correct 1495 ms 194836 KB Output is correct
4 Execution timed out 1589 ms 198144 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 9 ms 2900 KB Output is correct
4 Correct 10 ms 3016 KB Output is correct
5 Correct 3 ms 852 KB Output is correct
6 Correct 9 ms 1864 KB Output is correct
7 Correct 12 ms 3156 KB Output is correct
8 Correct 12 ms 3028 KB Output is correct
9 Correct 3 ms 724 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 9 ms 2900 KB Output is correct
4 Correct 10 ms 3016 KB Output is correct
5 Correct 3 ms 852 KB Output is correct
6 Correct 9 ms 1864 KB Output is correct
7 Correct 12 ms 3156 KB Output is correct
8 Correct 12 ms 3028 KB Output is correct
9 Correct 3 ms 724 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 9 ms 2900 KB Output is correct
13 Correct 10 ms 3020 KB Output is correct
14 Correct 3 ms 852 KB Output is correct
15 Correct 8 ms 1912 KB Output is correct
16 Correct 11 ms 3104 KB Output is correct
17 Correct 12 ms 3008 KB Output is correct
18 Correct 2 ms 724 KB Output is correct
19 Correct 47 ms 4532 KB Output is correct
20 Correct 90 ms 13344 KB Output is correct
21 Correct 50 ms 4728 KB Output is correct
22 Correct 70 ms 9408 KB Output is correct
23 Correct 95 ms 14640 KB Output is correct
24 Correct 97 ms 14464 KB Output is correct
25 Correct 90 ms 14596 KB Output is correct

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 9 ms 2900 KB Output is correct
4 Correct 10 ms 3016 KB Output is correct
5 Correct 3 ms 852 KB Output is correct
6 Correct 9 ms 1864 KB Output is correct
7 Correct 12 ms 3156 KB Output is correct
8 Correct 12 ms 3028 KB Output is correct
9 Correct 3 ms 724 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 10 ms 2900 KB Output is correct
13 Correct 11 ms 3028 KB Output is correct
14 Correct 3 ms 852 KB Output is correct
15 Correct 8 ms 1912 KB Output is correct
16 Correct 12 ms 3148 KB Output is correct
17 Correct 13 ms 3036 KB Output is correct
18 Correct 2 ms 724 KB Output is correct
19 Correct 1468 ms 188760 KB Output is correct
20 Correct 534 ms 54704 KB Output is correct
21 Correct 1334 ms 120076 KB Output is correct
22 Correct 1370 ms 172252 KB Output is correct
23 Execution timed out 1587 ms 180584 KB Time limit exceeded
24 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1465 ms 185768 KB Output is correct
2 Correct 1478 ms 194784 KB Output is correct
3 Execution timed out 1572 ms 197980 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1454 ms 185648 KB Output is correct
3 Correct 1495 ms 194836 KB Output is correct
4 Execution timed out 1589 ms 198144 KB Time limit exceeded
5 Halted 0 ms 0 KB -