Submission #1275919

#	Time	Username	Problem	Language	Result	Execution time	Memory
1275919		WH8	Strange Device (APIO19_strange_device)	C++20	10 / 100	1071 ms	16884 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;

#define int long long 
#define pll pair<int, int>
#define mp make_pair
#define pb push_back
#define f first
#define s second
int n,a,b;
vector<pair<int,int>> q;
set<pair<int,int>> s;

void upd(int l, int r){
	//~ printf("updating %lld to %lld\n", l, r);
	auto it=prev(s.lower_bound({l, LLONG_MIN}));
	if((*it).s >= l-1){
		l=(*it).f;
		r=max((*it).s, r);
		s.erase(it);
	}
	it=s.lower_bound({l, LLONG_MIN});
	while((*it).f <= r+1){
		r=max((*it).s, r);
		s.erase(it);
		it=s.lower_bound({l, LLONG_MIN});
	}
	s.insert({l, r});
	//~ for(auto [a,b]:s){
		//~ printf("(%lld, %lld) ",a,b);
	//~ }
	//~ cout<<endl;
}

signed main(){
	cin>>n>>a>>b;
	
	if(a > 1e18/b){
		int ans=0;
		for(int i=0;i<n;i++){
			int l,r;cin>>l>>r;
			ans+=r-l+1;
		}
		cout<<ans;
		return 0;
	}
	int m=a*b;
	s.insert({-5,-5});
	s.insert({1e18+5,1e18+5});
	for(int i=0;i<n;i++){
		int l,r;cin>>l>>r;
		q.pb({l,r});
		if(r-l >= m){
			cout<<m;
			return 0;
		}
		if(r % m < l % m){
			upd(l%m, m-1);
			upd(0, r%m);
		}
		else {
			upd(l%m, r%m);
		} 
	}
	int ans=0;
	for(auto it:s){
		ans+=it.s-it.f+1;
	}
	cout<<ans-2;
}		

• Subtask 1: 0 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30