Submission #1255745

#	Time	Username	Problem	Language	Result	Execution time	Memory
1255745		Nipphitch	Mobile (BOI12_mobile)	C++20	100 / 100	273 ms	16096 KiB

mobile

#include <bits/stdc++.h>
using namespace std;
#define int long long 
const int N=1e6+5;

int n,len,x[N],y[N];

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> len;
    for(int i=1;i<=n;i++) cin >> x[i] >> y[i];
    double l=0.00,r=1.5e9;
    while(r-l>1e-3){
        double mid=(l+r)/2;
        double cur=0;
        for(int i=1;i<=n;i++){
            double d=sqrt(mid*mid-y[i]*y[i]);
            double a=x[i]-d,b=x[i]+d;
            if(a<=cur) cur=max(cur,b);
        }
        if(cur>=len) r=mid;
        else l=mid;
    }
    cout << fixed << setprecision(4) << l;
}

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• Subtask 21: 5 / 5