백준 - ruby 연습(2739번, 2741번, 2439번, 10818번, 1978번)

백준 이용한 ruby 연습 2

 

1. 2739번

      

      

      

    
    

      <python />
    
n = gets.chomp.to_i
for i in 1..9
    puts "#{n} * #{i} = #{n*i}"
end

 

2. 2741번

      

      

      

    
    

      <python />
    
n = gets.chomp.to_i
for i in 1..n
    puts i
end

 

3. 2439번

      

      

      

    
    

      <python />
    
n = gets.chomp.to_i
k = 1
while n >= 1
    for j in 1..n-1
        print " "
    end
    for y in 1..k
        print"*"
    end
    k = k+1
    print "\n"
    n = n-1
end

 

4. 10818번

      

      

      

    
    

      <python />
    
gets;a=gets.split.map &:to_i;puts"#{a.min} #{a.max}"

 

5. 1978번

      

      

      

    
    

      <python />
    
n=gets.to_i
a=gets.split.map &:to_i
count=0

for i in 0...n
    if a[i] > 1
        for j in 2..a[i]
            break if a[i]%j ==0   
        end
        count += 1 if j == a[i] 
    end
end    
puts count