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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.stream.*;
  7. import java.math.*;
  8.  
  9. /* Name of the class has to be "Main" only if the class is public. */
  10. class Ideone
  11. {
  12. 	public static void main (String[] args) throws java.lang.Exception
  13. 	{
  14. 		for (Map.Entry entry : getChances(10, 20, 15).entrySet()) System.out.println(entry.getKey() + ": " + entry.getValue());
  15. 	}
  16.  
  17. 	@SafeVarargs
  18.         private static final int[] reverse(final int... array) {
  19.             int[] ret = new int[array.length];
  20.             for (int i = array.length-1; i > 0; i--){
  21.                 ret[Math.abs(0-i)] = array[i];
  22.             }
  23.             return ret;
  24.         }
  25.  
  26. 	private static Map<Integer, Float> getChances(int min, int max, int close) {
  27.             int differ = max - min;
  28.             if (close > max || close < min) {
  29.                 close = differ + min;
  30.             }
  31.             int[] numbers = IntStream.rangeClosed(min, max).toArray();
  32.             if (numbers[numbers.length-1] == close) {
  33.                 numbers = reverse(numbers);
  34.             }
  35.             Map<Integer, Float> chances = new LinkedHashMap<>();
  36.             chances.put(close, 50f);
  37.             for (int i = min; i <= max; i++) {
  38.             	float chance = new BigDecimal(50f).divide(new BigDecimal(Math.abs(i-close)*2), BigDecimal.ROUND_HALF_EVEN).setScale(2, i < close ? BigDecimal.ROUND_CEILING : BigDecimal.ROUND_FLOOR).floatValue();
  39.                 chances.putIfAbsent(i, chance);
  40.             }
  41.             return chances;
  42.         }
  43. }
Runtime error #stdin #stdout #stderr 0.19s 2841600KB
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Standard input is empty
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Standard output is empty
stderr
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Exception in thread "main" java.lang.ArithmeticException: / by zero
	at java.math.BigDecimal.divideAndRound(BigDecimal.java:4106)
	at java.math.BigDecimal.divide(BigDecimal.java:5198)
	at java.math.BigDecimal.divide(BigDecimal.java:1561)
	at java.math.BigDecimal.divide(BigDecimal.java:1622)
	at Ideone.getChances(Main.java:38)
	at Ideone.main(Main.java:14)
https://ideone.com/3MIn5T
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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