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package fun;
import java.util.Random;
import shared.Parse;
import shared.Shared;
import shared.Tools;
public class Chance {
//Probability of something with a chance of X happening at least Y times in Z chances
public static void main(String[] args){
int draws;
int minSuccess;
float prob;
long rounds;
try {
draws = Parse.parseIntKMG(args[0]);
minSuccess = Parse.parseIntKMG(args[1]);
prob = Float.parseFloat(args[2]);
rounds = Parse.parseKMG(args[3]);
} catch (Exception e) {
System.err.println("Chance (int)draws (int)minSuccess (float)prob (int)rounds");
System.exit(1);
throw new RuntimeException();
}
Random randy=Shared.threadLocalRandom();
long passes=0;
for(long i=0; i<rounds; i++){
int pass=runOneRound(randy, draws, minSuccess, prob);
passes+=pass;
}
double odds=passes*1.0/rounds;
System.err.println("Probability: "+Tools.format("%.6f%%", 100*odds));
}
private static int runOneRound(Random randy, int draws, int minSuccess, float prob) {
int success=0;
for(int i=0; i<draws && success<minSuccess; i++){
if(randy.nextFloat()<=prob){success++;}
}
return (success>=minSuccess ? 1 : 0);
}
}
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