제출 #682721

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
682721		bruhgamer	Mobile (BOI12_mobile)	Java	50 / 100	1102 ms	70572 KiB

mobile

//package USACO;
import java.util.*;
import java.io.*;
import java.text.DecimalFormat;
public class mobile {
	public static double search(double start, double end) {
		//System.out.println(start + " "  + end);
		if(start + 0.0001 >= end) {
			return start;
		}
		double mid = (start + end)/2;
		if(works(mid)) {
			return search(start, mid);
		}
		return search(mid, end);
	}
	public static int n;
	public static int l;
	public static long[][]arr;
	public static boolean works(double dis) {
		double to  = 0.0;
		for(int i = 0; i < n; i++) {
			double disx = Math.pow(((dis*dis) - (arr[i][1] * arr[i][1])), 0.5);
			//System.out.println(disx);
			double disxstart = arr[i][0] - disx;
			double disxend = arr[i][0] + disx;
			if(disxstart <= to) {
				to = Double.max(disxend, to);
			}
			//System.out.println(dis + " " + to);
		}
		return to >= l;
	}
	public static void main(String[]args) throws IOException{
		Kattio io = new Kattio();
		n = io.nextInt();
		l = io.nextInt();
		arr = new long[n][2];
		for(int i = 0; i < n; i++) {
			arr[i][0] = io.nextLong();
			arr[i][1] = io.nextLong();
		}
		DecimalFormat df = new DecimalFormat("#.#######");
		io.println(df.format(search(1.0, 500000000.0)));
		io.close();
	}
	static class Kattio extends PrintWriter {
		private BufferedReader r;
		private StringTokenizer st;
		// standard input
		public Kattio() { this(System.in, System.out); }
		public Kattio(InputStream i, OutputStream o) {
			super(o);
			r = new BufferedReader(new InputStreamReader(i));
		}
		// USACO-style file input
		public Kattio(String problemName) throws IOException {
			super(problemName + ".out");
			r = new BufferedReader(new FileReader(problemName + ".in"));
		}
		// returns null if no more input
		public String next() {
			try {
				while (st == null || !st.hasMoreTokens())
					st = new StringTokenizer(r.readLine());
				return st.nextToken();
			} catch (Exception e) { }
			return null;
		}
		public int nextInt() { return Integer.parseInt(next()); }
		public double nextDouble() { return Double.parseDouble(next()); }
		public long nextLong() { return Long.parseLong(next()); }
	}
		
}

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