Submission #1287668

#	Time	Username	Problem	Language	Result	Execution time	Memory
1287668		xyxwong	Mobile (BOI12_mobile)	C++20	0 / 100	442 ms	31548 KiB

mobile

#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
using namespace std;
#define ll long long
#define ld long double
#define fi first 
#define se second 
#define flt float
#define pld pair<ld,ld>

int main(){
    ios::sync_with_stdio(0);
    cin.tie(nullptr);
    ld n,l;cin>>n>>l;
    vector<pld>v(n);
    for(auto&p:v)cin>>p.fi>>p.se;
    ld lo = 0,hi = 1e18;
    while(hi-lo>1e-5){
        ld r = (lo+hi)/2;
        ld a = 0,b=1e-12;
        for(int i = 0;i<n;i++){
            auto&p = v[i];
            if(p.se<r)continue;
            ld bx = p.fi - sqrtl(r*r-p.se*p.se),ex = p.fi + sqrtl(r*r-p.se*p.se);
            b = max(b,ex);
            if(bx<=a)a = b;
        }
        if(a>=l){
            hi = r;
        }else{
            lo = r;
        }
    }
    cout.precision(5);
    cout<<lo;
}

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