Submission #684376

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
684376	2023-01-21 05:06:29	handlename	Mobile (BOI12_mobile)	C++17	70 / 100	1090 ms	31756 KiB

mobile

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#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define float long double
const int MOD=1e9+7;
//const int MOD=998244353;
const int sqn=450;
const long double eps=1e-4;
long double n,l,x[1000002],y[1000002];
void runtc(){
  cin>>n>>l;
  for (int i=1;i<=n;i++){
    cin>>x[i]>>y[i];
  }
  long double mini=0,maxi=2e9;
  while (mini+eps<maxi){
    long double mid=(mini+maxi)/2;
    long double cur=0;
    for (int i=1;i<=n;i++){
      long double lol=sqrt(mid*mid-y[i]*y[i]);
      if (x[i]-lol<=cur) cur=max(cur,x[i]+lol);
    }
    if (cur>=l) maxi=mid;
    else mini=mid;
  }
    cout<<fixed<<setprecision(4);
  cout<<maxi;
}
int main(){
 
 
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