10432 - Polygon Inside A Circle

[mpin3da]

the problem is precision... replace 3.141592 by acos(-1).

[vinitmuchhala]

my answers are correct, but i get runtime error, if somebody could get me started

Code: Select all

import java.io.*;
import java.util.*;

class Main {
    public static void main(String[] args) {
        // TODO code application logic here
        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        String line;
        ArrayList<Integer> radius = new ArrayList<>();
        ArrayList<Integer> numSides = new ArrayList<>();
        try {
            while((line = stdin.readLine()) != null && line.length() != 0){
                 radius.add(Integer.parseInt(line.split(" ")[0]));
                 numSides.add(Integer.parseInt(line.split(" ")[1]));
            }
           
        } catch (IOException ex) {
        }
        int i = 0;
        double halfTheta;
        while(i < radius.size()){
            halfTheta = (Math.PI)/numSides.get(i);
            System.out.println(Math.cos(halfTheta)*Math.sin(halfTheta)*(Math.pow(radius.get(i), 2))*numSides.get(i));
            i++;
        }
    }
}

[lbv]

my answers are correct, but i get runtime error, if somebody could get me started

The method your program uses to read input is too inflexible, which is often an issue in problems from UVa's archives. What does your program do if a test case contains spaces at the beginning of the line, or at the end, or more than one space between the two numbers?

Also, pay close attention to the output specification: The number must be rounded to the third digit after the decimal point.