제출 #958778

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
958778		Trisanu_Das	Mobile (BOI12_mobile)	C++17	100 / 100	348 ms	35428 KiB

mobile

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second

signed main(){
  ios_base::sync_with_stdio(false); cin.tie(NULL);
  int n, L; cin >> n >> L;
  pair<int, int> p[n]; for(int i = 0; i < n; i++) cin >> p[i].ff >> p[i].ss;
  double l = 1, r = 1.5e9;
  while(r - l > 1e-3){
    double mid = (l + r) / 2, chk = 0;
    for(int i = 0; i < n; i++){
      double d = sqrt(mid * mid - p[i].ss * p[i].ss);
      double a = p[i].ff - d, b = p[i].ff + d;
      if(a <= chk) chk = max(chk, b);
    }
    if(chk >= L) r = mid;
    else l = mid;
  }
  cout << fixed << setprecision(4) << l << '\n';
}

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