Submission #1164824

#	Time	Username	Problem	Language	Result	Execution time	Memory
1164824		Faisal_Saqib	Wish (LMIO19_noras)	C++20	0 / 100	1 ms	328 KiB

noras

#include <bits/stdc++.h>

using namespace std;
#define ll long long
#define ld long double
#define pl pair<ll,ll>
#define x first
#define y second
const ll N=2e5+69420;
pl f[N],s[N],inc[N];
ll n,r,dif[N];
bool check(int i,int p)
{
	ll fx=(f[i].x+inc[i].x*p);
	ll fy=(f[i].y+inc[i].y*p);
	return (fx*fx+fy*fy)<=(r*r);
}
void solve()
{
	cin>>n>>r;
	bool pos=1;
	for(int i=1;i<=n;i++)
	{
		cin>>f[i].x>>f[i].y>>s[i].x>>s[i].y;
		inc[i].x=(s[i].x-f[i].x);
		inc[i].y=(s[i].y-f[i].y);
		pos&=(inc[i].y==0);
	}
	if(pos)
	{
		for(int i=1;i<=n;i++)
		{
			if(check(i,0))
			{
				dif[0]++;
				dif[1]--;
			}
			ll xc=r*r - f[i].y*f[i].y;
			if(xc<0)continue;
			ld px=(ld)sqrtl(xc);
			// find t such that
			//0<=t and t<=2e4 
			// both inc[i].y and inc[i].x can't be zero
			ll ed=(px-f[i].x)/inc[i].x;
			ll st=max((ld)1.0,(-px-f[i].x+inc[i].x-1)/inc[i].x);
			if(inc[i].x<0)
			{
			 //   inc[i].x*=-1;
			    ed=(-px-f[i].x)/inc[i].x;
			    st=max((ld)1.0,(px-f[i].x+inc[i].x-1)/inc[i].x);
			 //   inc[i].x*=-1;
			}
// 			st=max(st,1ll);
			if(st<=ed)
			{
				// cout<<"Range "<<st<<' '<<ed<<endl;
				// cout<<px<<' '<<f[i].x<<' '<<inc[i].x<<endl;
				dif[st]++;
				dif[ed+1]--;
			}
			//  t >= (-px-f[i].x)/ inc[i].x
		}
		int as=0;
		int ans=0;
		for(int i=0;i<N;i++)
		{
			ans+=dif[i];
			as=max(ans,as);
		}
		cout<<as<<endl;
	}
	else
	{
		int as=0;
		for(int p=0;p<=2e4;p++)
		{
			int ans=0;
			for(int i=1;i<=n;i++)
			{
				ans+=check(i,p);
			}
			as=max(as,ans);
		}
		cout<<as<<endl;
	}
}
int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int t=1;
	// cin>>t;
	while(t--)solve();
	return 0;
}

• Subtask 1: 0 / 23
• Subtask 2: 0 / 23
• Subtask 3: 0 / 15
• Subtask 4: 0 / 32
• Subtask 5: 0 / 7