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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
7735 changed files with 38060 additions and 199180 deletions
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84
Task/Largest-number-divisible-by-its-digits/Java/largest-number-divisible-by-its-digits-2.java
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@ -3,54 +3,54 @@ import java.util.List;
public final class LargestNumberDivisibleByItsDigits {
public static void main(String[] args) {
// Base 10
final int decimalDivisor = 9 * 8 * 7;
int decimal = ( 9876432 / decimalDivisor ) * decimalDivisor;
while ( ! isLynchBellDecimal(decimal) ) {
decimal -= decimalDivisor;
}
System.out.println("The largest decimal Lynch-Bell number is " + decimal);
// Base 16
final long hexDivisor = 15L * 14 * 13 * 12 * 11;
long hexadecimal = ( 0xfedcba987654321L / hexDivisor ) * hexDivisor;
while ( ! isLynchBellHex(hexadecimal) ) {
hexadecimal -= hexDivisor;
}
System.out.println("The largest hexadecimal Lynch-Bell number is " + Long.toHexString(hexadecimal));
}
private static boolean isLynchBellDecimal(int decimal) {
String decimalString = Integer.toString(decimal);
public static void main(String[] args) {
// Base 10
final int decimalDivisor = 9 * 8 * 7;
int decimal = ( 9876432 / decimalDivisor ) * decimalDivisor;
while ( ! isLynchBellDecimal(decimal) ) {
decimal -= decimalDivisor;
}
System.out.println("The largest decimal Lynch-Bell number is " + decimal);
// Base 16
final long hexDivisor = 15L * 14 * 13 * 12 * 11;
long hexadecimal = ( 0xfedcba987654321L / hexDivisor ) * hexDivisor;
while ( ! isLynchBellHex(hexadecimal) ) {
hexadecimal -= hexDivisor;
}
System.out.println("The largest hexadecimal Lynch-Bell number is " + Long.toHexString(hexadecimal));
}
private static boolean isLynchBellDecimal(int decimal) {
String decimalString = Integer.toString(decimal);
if ( decimalString.contains("0") || decimalString.contains("5") ) {
return false;
return false;
}
List<Integer> distinctDigits =
Arrays.stream(decimalString.split("")).map( s -> Integer.valueOf(s) ).distinct().toList();
Arrays.stream(decimalString.split("")).map( s -> Integer.valueOf(s) ).distinct().toList();
if ( distinctDigits.size() < decimalString.length() ) {
return false;
return false;
}
return distinctDigits.stream().allMatch( i -> ( decimal % i ) == 0 );
}
private static boolean isLynchBellHex(long hexadecimal) {
String hexString = Long.toHexString(hexadecimal);
if ( hexString.contains("0") ) {
return false;
}
List<Integer> distinctDigits =
Arrays.stream(hexString.split("")).map( s -> Integer.valueOf(s, 16) ).distinct().toList();
if ( distinctDigits.size() < hexString.length() ) {
return false;
}
return distinctDigits.stream().allMatch( i -> ( hexadecimal % i ) == 0 );
}
}
private static boolean isLynchBellHex(long hexadecimal) {
String hexString = Long.toHexString(hexadecimal);
if ( hexString.contains("0") ) {
return false;
}
List<Integer> distinctDigits =
Arrays.stream(hexString.split("")).map( s -> Integer.valueOf(s, 16) ).distinct().toList();
if ( distinctDigits.size() < hexString.length() ) {
return false;
}
return distinctDigits.stream().allMatch( i -> ( hexadecimal % i ) == 0 );
}
}