제출 #468757

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
468757		DDTerziev04	Mobile (BOI12_mobile)	C++14	0 / 100	341 ms	24596 KiB

mobile

#include<iostream>
#include<cmath>
using namespace std;

const int MAXN=1e6;
const double MAXL=1e10;

pair<int, int> pts[MAXN];

bool CanCover(int n, int m, double l)
{
   double d=0;
   for(int i=0; i<n; i++)
   {
      double x=sqrt(l*l-abs(pts[i].second)*abs(pts[i].second));
      if(pts[i].first-x<=d)
      {
         d=pts[i].first+x;
      }

      if(d>=m)
      {
         return true;
      }
   }

   return d>=m;
}

int main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);

   int n, m;
   cin >> n >> m;

   for(int i=0; i<n; i++)
   {
      cin >> pts[i].first >> pts[i].second;
   }

   double diff=0.001, l=0, r=MAXL, ans;
   while(r-l>=diff)
   {
      double mid=l+(r-l)/2;
      if(CanCover(n, m, mid))
      {
         ans=mid;
         r=mid;
      }
      else
      {
         l=mid;
      }
   }

   cout << ans << "\n";

   return 0;
}

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