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Ingy döt Net 2015-02-20 09:02:09 -05:00
parent 00a190b0a6
commit 91df62d461
5697 changed files with 93386 additions and 804 deletions
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33
Task/Left-factorials/Java/left-factorials.java Normal file
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import java.math.BigInteger;
public class LeftFac{
public static BigInteger factorial(BigInteger n){
BigInteger ans = BigInteger.ONE;
for(BigInteger x = BigInteger.ONE; x.compareTo(n) <= 0; x = x.add(BigInteger.ONE)){
ans = ans.multiply(x);
}
return ans;
}
public static BigInteger leftFact(BigInteger n){
BigInteger ans = BigInteger.ZERO;
for(BigInteger k = BigInteger.ZERO; k.compareTo(n.subtract(BigInteger.ONE)) <= 0; k = k.add(BigInteger.ONE)){
ans = ans.add(factorial(k));
}
return ans;
}
public static void main(String[] args){
for(int i = 0; i <= 10; i++){
System.out.println("!" + i + " = " + leftFact(BigInteger.valueOf(i)));
}
for(int i = 20; i <= 110; i += 10){
System.out.println("!" + i + " = " + leftFact(BigInteger.valueOf(i)));
}
for(int i = 1000; i <= 10000; i += 1000){
System.out.println("!" + i + " has " + leftFact(BigInteger.valueOf(i)).toString().length() + " digits");
}
}
}