Submission #660091

#	Time	Username	Problem	Language	Result	Execution time	Memory
660091		Karuk	Event Hopping (BOI22_events)	C++14	25 / 100	1589 ms	198144 KiB

events

#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
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30