Submission #4962987

---

Source Code Expand

S = gets.chomp

alphabet = Array.new(26) {0}

S.chars.each do |c|
  alphabet[c.ord - 'a'.ord] += 1
end

if S.size != 26
  min = alphabet.find_index {|a| a == 0}
  char = ('a'.ord + min).chr
  puts S + char
else
  index = S.size - 1
  (S.size - 1).downto(1) do |i|
    if S[i] < S[i-1]
      index = i - 1
    else
      break
    end
  end

  if index == 0
    puts -1
  elsif index == 1
    puts (S[index-1].ord + 1).chr
  else

    ch = S[-1]
    index.upto(S.size-2) do |i|
      if S[index-1] > S[i]
        ch = S[i-1]
        break
      end
    end

    puts S[0..index-2] + ch
  end
end

Submission Info

Compile Error

./Main.rb:24: warning: ambiguous first argument; put parentheses or a space even after `-' operator

Judge Result