knuth

问题 where can i download ctwill? The ftp.cs.stanford.edu/pub/ctwill/ site doesn't work for me, either is ftp://labrea.stanford.edu/pub/ctwill/. Thanks, Raoul 回答1: Try http://ftp.cs.stanford.edu/pub/ctwill/ instead. Now if only I could find TWILL (CTWILL's plain WEB predecessor), which is what I actually wanted... Note: The above URL does not appear to play very nicely with NAT, so if you're behind one, I guess you'll have to download it from somewhere else. Also, the Amiga port at http:/

问题 where can i download ctwill? The ftp.cs.stanford.edu/pub/ctwill/ site doesn't work for me, either is ftp://labrea.stanford.edu/pub/ctwill/. Thanks, Raoul 回答1: Try http://ftp.cs.stanford.edu/pub/ctwill/ instead. Now if only I could find TWILL (CTWILL's plain WEB predecessor), which is what I actually wanted... Note: The above URL does not appear to play very nicely with NAT, so if you're behind one, I guess you'll have to download it from somewhere else. Also, the Amiga port at http:/

问题 I need to find all English words which can be formed from the letters in a string sentence="Ziegler's Giant Bar" I can make an array of letters by sentence.split(//) How can I make more than 4500 English words from the sentence in Ruby? [edit] It may be best to split the problem into parts: to make only an array of words with 10 letters or less the longer words can be looked up separately 回答1: [Assuming you can reuse the source letters within one word]: For each word in your dictionary list,

问题 I need to find all English words which can be formed from the letters in a string sentence="Ziegler's Giant Bar" I can make an array of letters by sentence.split(//) How can I make more than 4500 English words from the sentence in Ruby? [edit] It may be best to split the problem into parts: to make only an array of words with 10 letters or less the longer words can be looked up separately 回答1: [Assuming you can reuse the source letters within one word]: For each word in your dictionary list,

问题 I'm implementing a Knuth shuffle for a C++ project I'm working on. I'm trying to get the most unbiased results from my shuffle (and I'm not an expert on (pseudo)random number generation). I just want to make sure this is the most unbiased shuffle implementation. draw_t is a byte type ( typedef 'd to unsigned char ). items is the count of items in the list. I've included the code for random::get( draw_t max ) below. for( draw_t pull_index = (items - 1); pull_index > 1; pull_index-- ) { draw_t

问题 I'm doing the exercises to TAOCP Volume 1 Edition 3 and have trouble understanding the syntax used in the answer to the following exercise. Chapter 1 Exercise 8 Computing the greatest common divisor of positive integers m & n by specifying T j ,s j ,a j ,b j Let your input be represented by the string a m b n (m a's followed by n b's) Answer: Let A = {a,b,c}, N=5. The algorithm will terminate with the string a gcd(m,n) j T j s j b j a j 0 ab (empty) 1 2 Remove one a and one b, or go to 2. 1

问题 I'm doing the exercises to TAOCP Volume 1 Edition 3 and have trouble understanding the syntax used in the answer to the following exercise. Chapter 1 Exercise 8 Computing the greatest common divisor of positive integers m & n by specifying T j ,s j ,a j ,b j Let your input be represented by the string a m b n (m a's followed by n b's) Answer: Let A = {a,b,c}, N=5. The algorithm will terminate with the string a gcd(m,n) j T j s j b j a j 0 ab (empty) 1 2 Remove one a and one b, or go to 2. 1

问题 Thanks for looking at this question in advance. I am trying to order the following list of items: Bpgvjdfj,Bvfbyfzc Zjmvxouu,Fsmotsaa Xocbwmnd,Fcdlnmhb Fsmotsaa,Zexyegma Bvfbyfzc,Qkignteu Uysmwjdb,Wzujllbk Fwhbryyz,Byoifnrp Klqljfrk,Bpgvjdfj Qkignteu,Wgqtalnh Wgqtalnh,Coyuhnbx Sgtgyldw,Fwhbryyz Coyuhnbx,Zjmvxouu Zvjxfwkx,Sgtgyldw Czeagvnj,Uysmwjdb Oljgjisa,Dffkuztu Zexyegma,Zvjxfwkx Fcdlnmhb,Klqljfrk Wzujllbk,Oljgjisa Byoifnrp,Czeagvnj Into the following order: Bpgvjdfj Bvfbyfzc Qkignteu

问题 I have to model the execution plan of sorting a list of 5 elements, in python, using the minimum number of comparisons between elements. Other than that, the complexity is irrelevant. The result is a list of pairs representing the comparisons needed to sort the list at another time. I know there's an algorithm that does this in 7 comparisons (between elements, always, not complexity-wise), but I can't find a readable (for me) version. How can I sort the 5 elements in 7 comparisons, and build

问题 I can't figure out what Knuth meant in his instructions for an exercise 8 from Chapter 1.1. The task is to make an efficient gcd algorithm of two positive integers m and n using his notation theta[j] , phi[j] , b[j] and a[j] where theta and phi are strings and a and b - positive integers which represent computational steps in this case. Let an input be the string of the form a^mb^n . An excellent explanation of Knuth's algorithm is given by schnaader here. My question is how this may be