Submission #341312

#	Time	Username	Problem	Language	Result	Execution time	Memory
341312		ogibogi2004	Strange Device (APIO19_strange_device)	C++14	0 / 100	1 ms	364 KiB

strange_device

#include<bits/stdc++.h>
using namespace std;
#define ll long long
const ll INF=2e18;
ll n;
ll a,b;
map<ll,ll>mp;
ll l[1000002];
ll r[1000002];
int main()
{
	cin>>n;cin>>a>>b;
	ll d=__gcd(a,b+1);
	ll m;
	if(b>INF/(a/d))
	{
		m=INF;
	}
	else m=(a/d)*b;
	//cout<<m<<endl;
	for(ll i=1;i<=n;i++)
	{
		cin>>l[i]>>r[i];
	}
	for(ll i=1;i<=n;i++)
	{
		if((r[i]-l[i])>=m)
		{
			cout<<m<<endl;
			return 0;
		}
		ll l1=l[i]%m;
		ll r1=(r[i]+1)%m;
		//cout<<l1<<" "<<r1<<endl;
		if(l1<=r1)
		{
			mp[l1]++;
			mp[r1]--;
		}
		else
		{
			mp[0]++;
			mp[r1]--;
			mp[l1]++;
			mp[m]--;
		}
	}
	ll ans=0,cur=0,last=-1,cur1=0;
	for(auto xd:mp)
	{
		//if(xd.first==m)continue;
		cur+=xd.second;
		//cout<<"_"<<xd.first<<" "<<cur1<<endl;
		if(cur1>0)
		{
			ans+=xd.first-last;
		}
		last=xd.first;
		cur1=cur;
	}
	cout<<ans<<endl;
return 0;
}

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