python - a string that for every character in it, there exists all the characters which are alphabetically smaller than it before it -

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how check string every character in it, there exists characters alphabetically smaller before e.g aab correct while aacb not, because second case, have 'c' 'b' not present before it. aac not correct not have 'b' before 'c'.

a pseudocode. works cases abac too.

max = 'a' - 1  // character before 'a'  char in string   if char > max + 1     // bad string, stop algorithm   end    if char > max     max = char   end end

the idea need check character preceding current 1 alphabetically has occurred before. if have character e , d has occurred before, c, b , a did too.


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