Submission #1129921

#	Time	Username	Problem	Language	Result	Execution time	Memory
1129921		APerson	Mobile (BOI12_mobile)	Java	25 / 100	1105 ms	177004 KiB

mobile

import java.util.*;
public class mobile {
    static int n, l;
    static Point[] p;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        n = sc.nextInt();
        l = sc.nextInt();
        p = new Point[n];
        for(int i = 0; i < n; i++) p[i] = new Point(sc.nextDouble(), sc.nextDouble());
        double min = 0; double max = 1e10;
        while(max-min > 1e-3) {
            double mid = (max+min)/2;
            if(works(mid)) max = mid;
            else min = mid;
        }
        System.out.println(min);
        sc.close();
    }
    public static boolean works(double x) {
        double last = 0;
        for(int i = 0; i < n; i++) {
            double xDist = Math.sqrt(x*x-p[i].y*p[i].y);
            double l = p[i].x-xDist;
            double r = p[i].x+xDist;
            if(l < last) last = Math.max(last, r);
        }
        return last >= l;
    }
    public static class Point {
        double x, y;
        public Point(double x, double y) {
            this.x = x;
            this.y = Math.abs(y);
        }
    }
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5
• Subtask 7: 0 / 5
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• Subtask 21: 0 / 5