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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone {
  6.  
  7.     static class Child {
  8.  
  9.         boolean female;
  10.         boolean florida;
  11.  
  12.         public Child(boolean female, boolean florida) {
  13.             this.female = female;
  14.             this.florida = female && florida;
  15.         }
  16.     }
  17.  
  18.     public static void main(String[] args) {
  19.         final int FLORIDA_ONE_IN = args.length > 0 ? Integer.parseInt(args[0]) : 10;
  20.         Random rnd = new Random();
  21.         final Child[][] children = new Child[1000000][];
  22.         System.out.println("Generating");
  23.         for (int i = 0; i < children.length; i++) {
  24.             Child[] pair = new Child[2];
  25.             pair[0] = new Child(rnd.nextInt(2) == 0, rnd.nextInt(FLORIDA_ONE_IN) == 0);
  26.             pair[1] = new Child(rnd.nextInt(2) == 0, rnd.nextInt(FLORIDA_ONE_IN) == 0);
  27.             children[i] = pair;
  28.         }
  29.         System.out.println("Counting");
  30.         int oneIsGirl = 0;
  31.         int bothGirls = 0;
  32.         int oneIsFlorida = 0;
  33.         int oneFloridaBothGirls = 0;
  34.         int oneIsFloridaUnique = 0;
  35.         int oneFloridaBothGirlsUnique = 0;
  36.         for (int i = 0; i < children.length; i++) {
  37.             Child[] pair = children[i];
  38.             if (pair[0].female || pair[1].female) {
  39.                 oneIsGirl++;
  40.                 if (pair[0].female && pair[1].female) {
  41.                     bothGirls++;
  42.                 }
  43.             }
  44.             if (pair[0].florida || pair[1].florida) {
  45.                 oneIsFlorida++;
  46.                 oneIsFloridaUnique++;
  47.                 if (pair[0].female && pair[1].female) {
  48.                     oneFloridaBothGirls++;
  49.                     oneFloridaBothGirlsUnique++;
  50.                     if (pair[0].florida && pair[1].florida) {
  51.                         // not unique, remove from data
  52.                         oneIsFloridaUnique--;
  53.                         oneFloridaBothGirlsUnique--;
  54.                     }
  55.                 }
  56.             }
  57.         }
  58.         System.out.printf(">1 girl        %7d%n", oneIsGirl);
  59.         System.out.printf("both girls     %7d%n", bothGirls);
  60.         System.out.printf("chance         %9.2f%%%n",(100f * bothGirls) / oneIsGirl);
  61.         System.out.printf(">1 Florida     %7d%n", oneIsFlorida);
  62.         System.out.printf("both girls(F)  %7d%n", oneFloridaBothGirls);
  63.         System.out.printf("chance         %9.2f%%%n",(100f * oneFloridaBothGirls) / oneIsFlorida);
  64.         System.out.printf(">1 Florida(U)  %7d%n", oneIsFloridaUnique);
  65.         System.out.printf("both girls(FU) %7d%n", oneFloridaBothGirlsUnique);
  66.         System.out.printf("chance         %9.2f%%%n",(100f * oneFloridaBothGirlsUnique) / oneIsFloridaUnique);
  67.         System.out.println("Captain Hindsight to the rescue??");
  68.         int randomIsGirl = 0;
  69.         bothGirls = 0;
  70.         for (int i = 0; i < children.length; i++) {
  71.             Child[] pair = children[i];
  72.             int c = rnd.nextInt(2);
  73.             if (pair[c].female) {
  74.                 randomIsGirl++;
  75.                 if (pair[1-c].female) {
  76.                     bothGirls++;
  77.                 }
  78.             }
  79.         }
  80.         System.out.printf("random is girl %7d%n", randomIsGirl);
  81.         System.out.printf("both girls     %7d%n", bothGirls);
  82.         System.out.printf("chance         %9.2f%%%n",(100f * bothGirls) / randomIsGirl);
  83.     }
  84.  
  85. }
Success #stdin #stdout 0.9s 381632KB
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stdin
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stdout
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Generating
Counting
>1 girl         749790
both girls      249827
chance             33.32%
>1 Florida       97921
both girls(F)    47544
chance             48.55%
>1 Florida(U)    95364
both girls(FU)   44987
chance             47.17%
Captain Hindsight to the rescue??
random is girl  499712
both girls      249827
chance             49.99%
https://ideone.com/HWMZ4A
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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