import java.io.*;
import java.util.*;
public class main {
static int N;
static int L;
static boolean containsIntercept;
static ArrayList<Coordinate> coordinates;
public static void main(String[] args) throws IOException {
BufferedReader br;
PrintWriter out;
StringTokenizer st;
try {
br = new BufferedReader(new FileReader("highcard.in"));
out = new PrintWriter(new BufferedWriter(new FileWriter("highcard.out")));
st = new StringTokenizer(br.readLine());
} catch (Exception e) {
br = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(System.out);
st = new StringTokenizer(br.readLine());
}
N = Integer.parseInt(st.nextToken());
L = Integer.parseInt(st.nextToken());
coordinates = new ArrayList<>();
for(int i = 0; i < N; i++) {
st = new StringTokenizer(br.readLine());
coordinates.add(new Coordinate(Integer.parseInt(st.nextToken()), Integer.parseInt(st.nextToken())));
}
double left = 0;
double right = Double.MAX_VALUE;
double answer = 0;
do {
double mid = (left + right) / 2;
containsIntercept = false;
boolean working = works(mid);
if (working) {
answer = mid;
left = mid;
} else {
right = mid;
}
} while (!isEqual(left, right));
out.print(answer);
out.close();
}
static boolean works(double radius) {
ArrayList<Intercept> intercepts = new ArrayList<>();
int id = 0;
for(Coordinate c : coordinates) {
double[] theseInter = getIntercepts(c.x, c.y, radius);
if(theseInter.length == 2) {
intercepts.add(new Intercept(Math.min(theseInter[0], theseInter[1]), 1, id));
intercepts.add(new Intercept(Math.max(theseInter[0], theseInter[1]), 2, id));
id++;
} else if (theseInter.length == 1) {
intercepts.add(new Intercept(theseInter[0], 0, id));
id++;
}
}
intercepts.sort(new Compare());
int numCircles = 0;
for (Intercept intercept : intercepts) {
if (intercept.x >= 0 && intercept.x <= L) {
containsIntercept = true;
if(numCircles == 0 || (numCircles == 1 && intercept.type == 2)) {
return true;
}
}
if (intercept.type == 1) {
numCircles++;
} else if (intercept.type == 2) {
numCircles--;
}
}
return false;
}
static double[] getIntercepts(double k, double h, double radius) {
if(radius * radius - h * h > 0) {
double sqrt = Math.sqrt(radius * radius - h * h);
return new double[] {sqrt + k, -sqrt + k};
} else if (radius * radius - h * h == 0) {
return new double[] {k};
} else {
return new double[] {};
}
}
static boolean isEqual(double one, double two) {
return Math.abs(one - two) <= 0.001;
}
static class Coordinate {
int x;
int y;
public Coordinate(int x, int y) {
this.x = x;
this.y = y;
}
}
static class Intercept {
double x;
int type;
int id;
public Intercept(double x, int t, int id) {
this.x = x;
type = t;
this.id = id;
}
}
static class Compare implements Comparator<Intercept> {
@Override
public int compare(Intercept o1, Intercept o2) {
if(o1.x < o2.x) {
return -1;
} else if (o1.x == o2.x) {
return 0;
}
return 1;
}
}
}
Compilation message
mobile.java:4: error: class main is public, should be declared in a file named main.java
public class main {
^
1 error
