Submission #1167643

#	Time	Username	Problem	Language	Result	Execution time	Memory
1167643		LmaoLmao	Mobile (BOI12_mobile)	C++20	0 / 100	319 ms	16092 KiB

mobile

#include<bits/stdc++.h>
#define fi first
#define se second
#define name ""
#define int long long
using namespace std;

using ll = long long;
using ii = pair<ll, ll>;
using aa = array<int,3>;

double a[1000005][2];

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //freopen(name".inp", "r", stdin);
    //freopen(name".out", "w", stdout);
    int n ,L;
    cin >> n >> L;
    for(int i=1;i<=n;i++) {
      cin >> a[i][0] >> a[i][1];
    }
    double l=0,r=2e9;
    double ans;
    for(int j=0;j<50;j++) {
      double m=(l+r)/2;
      double cur=0;
      for(int i=1;i<=n;i++) {
        if(a[i][1]>=r) continue;
        double res=sqrt(m*m-a[i][1]*a[i][1]);
        if(a[i][0]-res<=cur) {
          cur=a[i][0]+res;
        }
      }
      if(cur>=L) {
        r=m-0.0001;
        ans=m;
      } else l=m+0.0001;
    }
    cout << ans;
    return 0;
}

/*
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*/

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