제출 #1138927

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1138927		gulmix	Mobile (BOI12_mobile)	C++20	100 / 100	924 ms	16068 KiB

mobile

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

int main(){
   //ifstream cin("cowdance.in");
   //ofstream cout("cowdance.out");
   ll n, le; cin >> n >> le;
   vector<pair<ll, ll>> a(n);
   for(int i = 0; i < n; i++){
      cin >> a[i].first >> a[i].second;
   }
   double l = 0, r = 1e9;
   for(int i = 0; i < 100; i++){
      double mid = (r + l) / 2;
      double curr = 0;
      for(int i = 0; i < n; i++){
         double y = sqrt(mid * mid - a[i].second * a[i].second);
         double x = a[i].first - y, b = a[i].first + y;
         if(x <= curr)curr = max(curr, b);
      }
      if(curr >= le)r = mid;
      else l = mid;
   }
   cout << setprecision(4) << fixed << l;
} 

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