Submission #1241863

#	Time	Username	Problem	Language	Result	Execution time	Memory
1241863		simplemind_31	Mobile (BOI12_mobile)	C++20	25 / 100	1096 ms	16016 KiB

mobile

#include <bits/stdc++.h>
#define ALL(x) x.begin(),x.end()
using namespace std;
typedef long long ll;
typedef long double ld;
ll n,L,con;
bool cmp(pair<ll,ll> x,pair<ll,ll> y){
    if(x.first==y.first){
        return abs(x.second)<abs(y.second);
    }
    return x.first<y.first;
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin >> n >> L;
    vector<pair<ll,ll>> point(n);
    for(int i=0;i<n;i++){
        cin >> point[i].first >> point[i].second;
    }
    sort(ALL(point),cmp);
    ld iz=0,de=4e9;
    while(con<64){
        ld mid=(iz+de)/2;
        pair<ld,ld> last={0,0};
        for(int i=0;i<n;i++){
            ld dist=sqrtl(mid*mid-(point[i].second*point[i].second));
            pair<ld,ld> now={((ld)point[i].first)-dist,((ld)point[i].first)+dist};
            if(last.second<now.first || now.second<last.first){
                continue;
            }
            last={min(last.first,now.first),max(last.second,now.second)};
        }
        if(last.second>=(ld)L){
            de=mid;
        }else{
            iz=mid;
        }
        con++;
    }
    cout << fixed << setprecision(12) << iz;
}

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