Submission #767349

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Source Code Expand

s=Array.new(289,0)
gets.to_i.times{
  a,b=gets.split(?-)
  c=a[0,2].to_i*60+a[2,2].to_i
  c-=c%5
  d=b[0,2].to_i*60+b[2,2].to_i
  d+=5-d%5 if d%10!=0 && d%5!=0
  s[c/5]+=1
  s[d/5]-=1
}
x,y,z=0
f=false
289.times{|i|
  x+=s[i]
  if !f&&x!=0
    f=true
    y=sprintf("%02d",i*5/60)+sprintf("%02d",i*5%60)
  elsif f && x==0
    e=sprintf("%02d",i*5/60)+sprintf("%02d",i*5%60)
    puts "#{y}-#{e}"
    f=false
  elsif f
    z=i
  end
}

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