Submission #1220896

#	Time	Username	Problem	Language	Result	Execution time	Memory
1220896		sam230609	Mobile (BOI12_mobile)	C++20	30 / 100	1096 ms	16092 KiB

mobile

#include <bits/stdc++.h>
#define x first
#define y second
using namespace std;
typedef long long ll;
typedef long double ld;
pair<ll,ll> p[1000000]; ll n,k; ld l=1,r=1.5e9;
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin >>n>>k;
	for(ll i=0;i<n;i++) cin >>p[i].x>>p[i].y;
	while(r-l>1e-3){
		ld mid=(l+r)/2,cur=0;
		for(ll i=0;i<n;i++){
			ld d=sqrt(mid*mid-p[i].y*p[i].y);
			ld a=p[i].x-d,b=p[i].x+d;
			if(a<=cur) cur=max(cur,b);
		}if(cur>=k) r=mid; else l=mid;
	}cout <<fixed<<setprecision(6)<<l;
}

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