Submission #1241862

#	Time	Username	Problem	Language	Result	Execution time	Memory
1241862		simplemind_31	Mobile (BOI12_mobile)	C++20	0 / 100	385 ms	15940 KiB

mobile

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
ll n,L,con;
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;
    }
    ll l=0,r=3e9;
    while(l<r){
        ll mid=(l+r)>>1;
        //radio mid;
        pair<ll,ll> last={0,0};
        for(int i=0;i<n;i++){
            ll dist=sqrtl(mid*mid-point[i].second*point[i].second);
            pair<ll,ll> now={point[i].first-dist,point[i].first+dist};
            if(last.second>=now.first){
                last.second=now.second;
            }else{
                break;
            }
        }
        if(last.second>=L){
            r=mid;
        }else{
            l=mid+1;
        }
    }
    ld iz=l-1,de=l;
    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){
                last.second=now.second;
            }else{
                break;
            }
        }
        if(last.second>=(ld)L){
            de=mid;
        }else{
            iz=mid;
        }
        con++;
    }
    cout << fixed << setprecision(6) << iz;
}

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