File: sieve.rb

package info (click to toggle)
ruby2.3 2.3.3-1%2Bdeb9u8
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 65,344 kB
  • sloc: ruby: 639,947; ansic: 317,772; xml: 25,445; yacc: 9,068; javascript: 6,648; lisp: 2,568; tcl: 949; makefile: 623; sh: 533; perl: 62; sed: 53; python: 47; awk: 36; asm: 35
file content (14 lines) | stat: -rw-r--r-- 245 bytes parent folder | download | duplicates (22) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
 
# sieve of Eratosthenes
max = Integer(ARGV.shift || 100)
sieve = []
for i in 2 .. max
  sieve[i] = i
end

for i in 2 .. Math.sqrt(max)
  next unless sieve[i]
  (i*i).step(max, i) do |j|
    sieve[j] = nil
  end
end
puts sieve.compact.join(", ")