largenumber

问题 What is an efficient way of finding the number of ways k gifts can be chosen from N gifts where N can be very large (N ~ 10^18). That is we have to calculate N(C)K or N chose K. K can also be of the order of N. 回答1: I guess there are no fast ways to compute such large numbers. You can approximate it using Stirling's formula 回答2: Stirling's formula would be useful only if you had further asymptotic information such as k ~ n / 3 or k ~ log n . With no further information on your specific

问题 This question already has answers here : range and xrange for 13-digit numbers in Python? (9 answers) Closed 6 years ago . I want to iterate a large number such as 600851475143 using the range() function in Python. But whenever I run the program it gives me an OverflowError. I have used the following code - um = long(raw_input()) for j in range(1,num): .... I have tried it many times but it is not working! 回答1: Use itertools.islice() if your indices are long numbers: from itertools import

问题 Here is the link to the problem: http://www.spoj.com/problems/GCD/ Consider the decimal representation of a natural number N. Find the greatest common divisor (GCD) of all numbers that can be obtained by permuting the digits in the given number. Leading zeroes are allowed. I worked on the following approach : https://math.stackexchange.com/a/22453 First, if all the digits are the same, there is only one number and that is the GCD. As was pointed out before, if 3 or 9 is a factor of one

问题 I need to convert a large decimal to binary how would I go about doing this? Decimal in question is this 3324679375210329505 回答1: http://www.wikihow.com/Convert-from-Decimal-to-Binary 回答2: How about: String binary = Long.toString(3324679375210329505L, 2); 回答3: You may want to go for BigDecimal. A BigDecimal consists of an arbitrary precision integer unscaled value and a 32-bit integer scale.The BigDecimal class provides operations for arithmetic, scale manipulation, rounding, comparison,

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . X and Y are integers larger than 100 digits. Find the integer P which is within the range [ X , Y [ and that guaranties the "best" prime decomposition (i.e. the decomposition with the most unique prime factors). What I've done is just check the primality and decompose each number in the range and find the number

问题 Javascript represents all numbers as double-precision floating-point. This means it loses precision when dealing with numbers at the very highest end of the 64 bit Java Long datatype -- anything after 17 digits. For example, the number: 714341252076979033 ... becomes: 714341252076979100 My database uses long IDs and some happen to be in the danger zone. I could change the offending values in the database, but that'd be difficult in my application. Instead, right now I rather laboriously

问题 I have to store the number 600851475143 in my program. I tried to store it in long long int variable and long double as well but on compiling it shows the error integer constant is too large for "long" type. I have also tried unsigned long long int too. I am using MinGW 5.1.6 for running g++ on windows. What datatype should I use to store the number? 回答1: long long is fine, but you have to use a suffix on the literal. long long x = 600851475143ll; // can use LL instead if you prefer. If you

问题 Resolution: It turns out there is (probably) "nothing wrong" with the code itself; it is just inefficient. If my math is correct, If I leave it running it will be done by Friday, October 14, 2011. I'll let you know! Warning: this may contain spoilers if you are trying to solve Project Euler #3. The problem says this: The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ? Here's my attempt to solve it. I'm just starting with Java and

问题 public static string GetProperty(SearchResult searchResult, string PropertyName) { if (searchResult.Properties.Contains(PropertyName)) { return searchResult.Properties[PropertyName][0].ToString(); } else { return string.Empty; } } The above method works great for most Active Directory properties except those that are related to date/time such as pwdLastSet, maxPwdAge, etc. My question is how to I get the pwdLastSet to a human readable datetime (like 8/13/2013 or August 13, 2013, etc) I've

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: Working with large numbers in PHP. I run a completely useless Facebook app. I'm having a problem with PHP's support for integers. Basically, users give themselves ridiculous numbers of points. The current "king" has 102,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,002,557,529,927 points. PHP does not seem to play well with large integers. When someone tries to add more than a certain