Anonymous user
Humble numbers: Difference between revisions
→{{header|Haskell}}
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=={{header|Java}}==
<lang java>
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class HumbleNumbers {
public static void main(String[] args) {
System.out.println("First 50 humble numbers:");
System.out.println(Arrays.toString(humble(50)));
Map<Integer,Integer> lengthCountMap = new HashMap<>();
BigInteger[] seq = humble(1_000_000);
for ( int i = 0 ; i < seq.length ; i++ ) {
BigInteger humbleNumber = seq[i];
int len = humbleNumber.toString().length();
lengthCountMap.merge(len, 1, (v1, v2) -> v1 + v2);
}
List<Integer> sorted = new ArrayList<>(lengthCountMap.keySet());
Collections.sort(sorted);
System.out.printf("Length Count%n");
for ( Integer len : sorted ) {
System.out.printf(" %2s %5s%n", len, lengthCountMap.get(len));
}
}
private static BigInteger[] humble(int n) {
BigInteger two = BigInteger.valueOf(2);
BigInteger twoTest = two;
BigInteger three = BigInteger.valueOf(3);
BigInteger threeTest = three;
BigInteger five = BigInteger.valueOf(5);
BigInteger fiveTest = five;
BigInteger seven = BigInteger.valueOf(7);
BigInteger sevenTest = seven;
BigInteger[] results = new BigInteger[n];
results[0] = BigInteger.ONE;
int twoIndex = 0, threeIndex = 0, fiveIndex = 0, sevenIndex = 0;
for ( int index = 1 ; index < n ; index++ ) {
results[index] = twoTest.min(threeTest).min(fiveTest).min(sevenTest);
if ( results[index].compareTo(twoTest) == 0 ) {
twoIndex++;
twoTest = two.multiply(results[twoIndex]);
}
if (results[index].compareTo(threeTest) == 0 ) {
threeIndex++;
threeTest = three.multiply(results[threeIndex]);
}
if (results[index].compareTo(fiveTest) == 0 ) {
fiveIndex++;
fiveTest = five.multiply(results[fiveIndex]);
}
if (results[index].compareTo(sevenTest) == 0 ) {
sevenIndex++;
sevenTest = seven.multiply(results[sevenIndex]);
}
}
return results;
}
}
</lang>
{{Out}}
<pre>
First 50 humble numbers:
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 25, 27, 28, 30, 32, 35, 36, 40, 42, 45, 48, 49, 50, 54, 56, 60, 63, 64, 70, 72, 75, 80, 81, 84, 90, 96, 98, 100, 105, 108, 112, 120]
Length Count
1 9
2 36
3 95
4 197
5 356
6 579
7 882
8 1272
9 1767
10 2381
11 3113
12 3984
13 5002
14 6187
15 7545
16 9081
17 10815
18 12759
19 14927
20 17323
21 19960
22 22853
23 26015
24 29458
25 33188
26 37222
27 41568
28 46245
29 51254
30 56618
31 62338
32 68437
33 74917
34 81793
35 89083
36 96786
37 63955
</pre>
=={{header|JavaScript}}==
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