Submission #1120141

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120141		vjudge1	Event Hopping (BOI22_events)	C++17	0 / 100	157 ms	13208 KiB

events

#include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
typedef long long ll;
void solve() {
    ll n; cin>>n;
    ll Q; cin>>Q;
    map<ll, pair<ll, ll>> ord;
    vector<pair<ll, pair<ll, ll>>> v;
    for(ll i=1; i<=n; i++) {
        ll l,r; cin>>l>>r;
        v.push_back({r, {l, i}});
    }
    sort(v.begin(), v.end());
    ll p=1, chain=1;
    ll lst=-1;
    for(auto [r, to]: v) {
        ll l=to.f, i=to.s;
        // cout<<i<<" ";
        if(lst == -1 || l <= lst) {
            ord[i]={chain, p++};
            lst=r;
        } else {
            p=1;
            ord[i]={++chain, p++};
            lst=r;
        }
    }
    // cout<<"\n\n";
    // for(auto to: ord) {
    //     cout<<to.f<<" "<<to.s.f<<" "<<to.s.s<<"\n";
    // }
    for(ll i=1; i<=Q; i++) {
        ll l, r; cin>>l>>r;
        if(ord[r].f != ord[l].f || ord[l].s > ord[r].s) cout<<"impossible\n";
        else cout<<ord[r].s-ord[l].s<<"\n";
    }
}
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int t=1;
    // cin>>t;
    while(t--) {
        solve();
        cout<<'\n';
    }
}
/*
5 5
2 3
1 2
7 9
4 7
4 6
2 1
5 2
5 4
4 5
5 3
*/

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30