A permutation is an ordered arrangement of objects. For example, 3124 is one possible permutation of the digits 1, 2, 3 and 4. If all of the permutations are listed numerically or alphabetically, we call it lexicographic order. The lexicographic permutations of 0, 1 and 2 are:
012 021 102 120 201 210
What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?
Permalink: http://projecteuler.net/problem=24Read on →
Recently, I've re-read awesome java book Effective Java by Joshua Bloch. The book contains 78 independent items, discussing various aspects of programming in java. Something like mini-design patterns with emphasis on their pros and cons.
Few notes from each item as a refresher.Read on →
Programming Sucks.Read on →
Clojure is a great language, and as every language, it has some unobvious and strange things, which seem confusing.
Some of such things are gathered here. Most of them encountered by stupidity, docs misunderstanding, clojure specifics and procrastination.Read on →
Find the sum of all the positive integers which cannot be written as the sum of two abundant numbers.
Permalink: http://projecteuler.net/problem=23Read on →
Numberto has new features!Read on →
How to live in the Kingdom of Nouns, why mathematicians cry, filling gaps in algorithms, portion of clojure, STM, HTTP and more.Read on →
Using names.txt a 46K text file containing over five-thousand first names, begin by sorting it into alphabetical order. Then working out the alphabetical value for each name, multiply this value by its alphabetical position in the list to obtain a name score.
For example, when the list is sorted into alphabetical order, COLIN, which is worth 3 + 15 + 12 + 9 + 14 = 53, is the 938th name in the list. So, COLIN would obtain a score of 938 x 53 = 49714.
What is the total of all the name scores in the file?
Permalink: http://projecteuler.net/problem=22Read on →
Evaluate the sum of all the amicable numbers under 10000.
Permalink: http://projecteuler.net/problem=21Read on →
All you need to play with numbers!Read on →