biginteger

问题 This question already has answers here : Why _umul128 works slower than scalar code for mul128x64x2 function? (1 answer) SIMD signed with unsigned multiplication for 64-bit * 64-bit to 128-bit (2 answers) Is there hardware support for 128bit integers in modern processors? (3 answers) Is there a 128 bit integer in gcc? (3 answers) Closed 3 months ago . I'm trying to implement multiplication of 128 unsigned int on two 64 unsigned integers by Intel AVX. The problem is that non vectorised version

问题 Question: This code in Java: BigInteger mod = new BigInteger("86f71688cdd2612ca117d1f54bdae029", 16); produces (in java) the number 179399505810976971998364784462504058921 However, when I use C#, BigInteger mod = BigInteger.Parse("86f71688cdd2612ca117d1f54bdae029", System.Globalization.NumberStyles.HexNumber); // base 16 i don't get the same number, I get: -160882861109961491465009822969264152535 However, when I create the number directly from decimal, it works BigInteger mod = BigInteger

问题 I have a json that contains a field with a bigint {"NETWORK_ID": 6000370005980500000071} The format I have before marshaling is map[string]interface{} When I marshal it and print to console everything seems to be fine but this field actually creates problems due to its size in other mediums so I want to serialize it as a string. UseNumber() seems to be for this purpose but it's only for decoding I think. Is there any way that I can detect this kind of bigint number and make them serialize as

问题 Are there known algorithms which will take a big integer with n digits encoded in one base/radix and convert it to another arbitrary base? (Let's say from base 7 to base 19.) n can be really big, like more than 100 000 digits, so I am looking for something better than O( n 2 ) run time. I have seen some algorithms that can multiply two huge integers using the Fast Fourier Transform (FFT), with the theoretical complexity of O( n log n ), where n is the number of digits, so I wonder if

问题 I have a factorial lookup table that contains the first 30 integer factorials. This table is used in a function that is compiled with numba.njit . The issue is, above 20!, the number is larger than a 64-bit signed integer (9,223,372,036,854,775,807), which causes numba to raise a TypingError. If the table is reduced to only include the first 20 integer factorials the function runs fine. Is there a way to get around this in numba? Perhaps by declaring larger integer types in the jit compiled

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: diffucilty with BigInteger import java.math.BigInteger; public class KillerCode{ public static void main(String[]args){ BigInteger sum=null; for(int i=1;i<=1000;i++){ sum=sum+Math.pow(i, i); System.out.println(sum); } } } When I try to run this code the following error message is coming up. The operator + is undefined for the argument type(s) BigInteger,double. How can I solve this? Thank you. 回答1: You cannot

问题 Java : jre1.8.0_45 I finished debugging my Elliptic Curve class and in logging all characteristics of the keys I also log the BIT length of the keys (which with Elliptic Curve is not always an even number of bits). I display the bit length of the Keys via a BigInteger: ECPrivateKey oPK=generate the key ... BigInteger oBI=oPK.getS(); MetaLogBook.debug("Key Size in Bits :"+oBI.bitLength()+ "\nRaw Key Hex : 0x"+oBI.toString(16)).toUpperCase()+"\n"+); While the key is always correctly represented

问题 I have a data file ( csv ) with Nilsimsa hash values. Some of them would have as long as 80 characters. I wish to read them in Python for data analysis tasks. Is there a way to import the data in python without information loss? EDIT: I have tried the implementations proposed in the comments but that does not work for me. Example data in csv file would be: 77241756221441762028881402092817125017724447303212139981668021711613168152184106 回答1: Start with a simple text file to read in, just one

问题 How is it possible to deal with incredibly long (large) numbers in vb.net? I am working on Problem 25 in Project Euler, and my program cannot handle these computations. Is there a data type that can handle thousands of digits? 回答1: System.Numerics.BigInteger in .NET 4.0. 回答2: The point of the challenge is to make you write the code to handle big numbers. Using a library definitely isn't the point. You know how to solve it with a (large) piece of paper and a pencil, right? Note how a large

问题 I am using json_encode to transform my php multidimensional array to output json. Normally, this function would convert all values to strings. To make sure that integers values are send to javascript as integer values, I am using the numeric check: $json = json_encode($data, JSON_NUMERIC_CHECK); This works fine in all but one case for my app. In the php array (which is extracted from the database), there is one field that contains very large integers. I save it to database as a VARCHAR, but