Submission #1067958

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1067958	2024-08-21 06:08:56	Oz121	Mobile (BOI12_mobile)	Java	0 / 100	1049 ms	131072 KiB

mobile

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import java.io.*;
import java.util.*;
public class mobile {
    public static int num; public static double[][] arr;
    public static void main(String[] args) throws IOException {
        FastIO io = new FastIO(); num = io.nextInt(); int L = io.nextInt(); arr = new double[num][2];
        for (int i = 0;i<num;i++) {
            arr[i][0] = io.nextInt(); arr[i][1] = io.nextInt();
        }
        double l = 0; double h = Math.pow(10,9);
        while (h-l>Math.pow(10,-3)) {
            double mid = (l+h)/2; boolean work = true;
            ArrayList<Pair> endpoints = getEndpoints(mid);
            if (endpoints.isEmpty()) {l = mid; continue;}
            double right = endpoints.get(0).r;
            for (int i = 1;i<endpoints.size();i++) { //If [endpoints.get(0).l,right] and [endpoints.get(i).l,endpoints.get(i).r] overlap, take union
                double newL = endpoints.get(i).l;
                if (newL<=right) right = Math.max(right,endpoints.get(i).r);
            }
            work = endpoints.get(0).l<=0&&right>=L;
            if (work) h = mid;
            else l = mid;
        }
        io.println((l+h)/2); io.close();
    }
 
 
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