Submission #206799

#	Time	Username	Problem	Language	Result	Execution time	Memory
206799		rkm0959	Strange Device (APIO19_strange_device)	C++14	65 / 100	609 ms	33920 KiB

strange_device

#include <bits/stdc++.h>
#define fio ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
typedef long long int ll;
typedef long double ldb;
ll gcd(ll x,ll y){if(!x||!y) return x+y; return x%y==0?y:gcd(y,x%y);}

ll n, A, B, inf=2e18, ans;
pair<ll, ll> wow[2111111];

int main(void)
{
	fio; ll i, j, u, v, cnt=0;
	cin>>n>>A>>B; ll g=gcd(A, B+1);
	__int128 cc=(A/g); cc=cc*B;
	for(i=1 ; i<=n ; i++)
	{
		cin>>u>>v;
		if(cc>=inf) { wow[++cnt]=make_pair(u, v); continue; }
		u=(ll)(u%cc); v=(ll)(v%cc);
		if(u<=v) wow[++cnt]=make_pair(u, v);
		if(u>v)
		{
			wow[++cnt]=make_pair(u, (ll)cc-1LL);
			wow[++cnt]=make_pair(0LL, v);
		}
	}
	sort(wow+1, wow+cnt+1);
	for(i=1 ; i<=cnt ; i++)
	{
		j=i; ll rng=wow[i].second;
		while(j<=cnt && wow[j].first<=rng)
			{ rng=max(rng, wow[j].second); j++; }
		j--; ans+=(rng-wow[i].first+1); i=j;
	}
	cout<<ans; return 0;
}

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