Submission #1066718

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1066718	2024-08-20T05:41:39 Z	Oz121	Mobile (BOI12_mobile)	Java 11	Compilation error	0 ms	0 KB

mobile

import java.io.*;
import java.util.*;
public class M=mobile {
    public static int num; public static double[][] arr;
    public static void main(String[] args) throws IOException {
        BufferedReader scan = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer l1 = new StringTokenizer(scan.readLine()); num = Integer.parseInt(l1.nextToken()); int L = Integer.parseInt(l1.nextToken()); arr = new double[num][2];
        for (int i = 0;i<num;i++) {
            StringTokenizer st = new StringTokenizer(scan.readLine());
            arr[i][0] = Integer.parseInt(st.nextToken());
            arr[i][1] = Integer.parseInt(st.nextToken());
        }

        double l = 0; double h = Math.pow(10,9);
        while (h-l>Math.pow(10,-3)) {
            double mid = (l+h)/2; boolean work = true;
            double[][] endpoints = getEndpoints(mid);

            Arrays.sort(endpoints, (i,j)->Double.compare(i[0],j[0]));

            /*System.out.println("  "+mid);
            for (int i = 0;i<num;i++) {
                System.out.println(endpoints[i][0]+" "+endpoints[i][1]);
            }
            System.out.println("--------");*/

            double left = endpoints[0][0]; double right = endpoints[0][1];
            for (int i = 1;i<num;i++) {
                if (endpoints[i][0]>right) work = false;
                left = Math.min(left, endpoints[i][0]); right = Math.max(right, endpoints[i][1]);
            }
            work = (work)&&(left<=0&&right>=L);

            if (work) h = mid;
            else l = mid;
        }

        System.out.println((l+h)/2);
    }

    public static double[][] getEndpoints (double r) {
        double[][] endpoints = new double[num][2];
        for (int i = 0;i<num;i++) {
            endpoints[i][0] = arr[i][0]-Math.sqrt(r*r-arr[i][1]*arr[i][1]);
            endpoints[i][1] = arr[i][0]+Math.sqrt(r*r-arr[i][1]*arr[i][1]);
        }
        return endpoints;
    }
}

Compilation message

mobile.java:3: error: '{' expected
public class M=mobile {
              ^
1 error