Submission #973951

#	Time	Username	Problem	Language	Result	Execution time	Memory
973951		andrewp	Mobile (BOI12_mobile)	C++14	50 / 100	33 ms	3676 KiB

mobile

//Dedicated to my love,ivaziva
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define dbg(x) cerr<<#x<<": "<<x<<endl;
#define pb push_back
#define fi first
#define se second
#define mp make_pair
#define mt make_tuple
#define pii pair<int,int>
#define pll pair<ll,ll>
#define ldb double
const ll inf=(ll)1e18+5;
const int mod=1e9+7;
const int K=512;
const int L=30;
const int N=1e5+1;
ll n,l;
pll a[N];
int main()
{
    ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>l;
	for(int i=0;i<n;i++) cin>>a[i].fi>>a[i].se;
	ldb bot=1.00,top=(ldb)1.5e9;
	while(top-bot>1e-3)
    {
		ldb mid=(bot+top)/2,calc=0;
		for(int i=0;i<n;i++)
		{
			ldb razl=sqrt((ldb)(mid*mid)-(ldb)(a[i].se*a[i].se));
			ldb x=(ldb)a[i].fi-razl;
			ldb y=(ldb)a[i].fi+razl;
			if(x<=calc)
            {
                calc=max(calc,y);
            }
		}
		if(calc>=(ldb)l) top=mid;
		else bot=mid;
	}
	cout<<fixed<<setprecision(4)<<bot;
    return 0;
}

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