@heptapod here is such a random test (each memory length is 100) for which your code returns 0 where instead it should return -1:

alice = ["fans", "sick", "eave", "moos", "gown", "knit", "when", "sins", "miff", "jour", "balk", "duro", "swum", "aria", "eyas", "born", "waxy", "jolt", "aloe", "haik", "sidh", "peds", "pias", "guys", "leno", "fern", "vugg", "neap", "vena", "hays", "buds", "fiar", "melt", "scry", "toes", "okas", "firn", "bags", "awny", "poly", "your", "keta", "weld", "kiva", "urds", "palp", "hint", "dang", "anil", "ryot", "goth", "torn", "ansa", "crus", "rose", "toke", "rear", "haws", "peri", "bill", "kaon", "hobo", "gawp", "keep", "wart", "deil", "elks", "trug", "whig", "shin", "pepo", "awee", "syce", "dags", "mole", "ludo", "shaw", "supe", "baht", "euro", "jell", "abye", "fuds", "twit", "lino", "kohl", "awry", "kadi", "safe", "tams", "kune", "odah", "haes", "glim", "vein", "ouds", "sers", "oohs", "zeds", "idol"]
bob   = ["purs", "doms", "glug", "sabe", "davy", "deni", "curr", "byte", "raki", "mure", "hold", "burg", "fisk", "bias", "lipa", "trap", "demo", "room", "ghee", "hogs", "wham", "myna", "acta", "snit", "vara", "larn", "ditz", "unco", "cast", "hags", "tavs", "ache", "dunt", "bona", "peak", "heel", "guvs", "dune", "puli", "gyre", "wynn", "ruck", "inby", "sake", "bent", "akee", "ance", "kaka", "mews", "fame", "jury", "tora", "week", "epee", "wych", "riot", "bize", "crew", "jiao", "karn", "fogs", "lieu", "beds", "meow", "caph", "reck", "mixt", "hyla", "sine", "tump", "keir", "tear", "birr", "fawn", "juco", "jowl", "jell", "nave", "oaky", "tzar", "nebs", "talk", "lent", "dies", "hilt", "dint", "guls", "sext", "jigs", "woof", "nene", "tike", "leys", "mark", "wire", "nite", "anas", "atma", "coma", "risk"]
word = "supe"
first = 1

@YuKir hi, again: please get back to me with some data, thanks

@heptapod hi, your solution code may be exactly the same, but if your results are not the same ~ then the difference is in the tests (and you are going to have to trust the Codewars tests). For example, try this; get all of the exact input from a random test from Codewars that fails your test. Drop that test into your environment and see what happens.

same, but JS, idk what is this

Never mind about this comment. I don't think memoization with recursion works you have to use a loop.

the current version works only with py2. to avoid what you did, just use // instead.

According to CW wiki Sympy is not available.

There are several random tests that the first time you submitted didn't pick up an error in your code but the second time the random tests may have missed it. If anything its a problem with my tests not testing all edge cases, which I will look into :-)

@heptapod, my apologies. Pls post your code here and will take a look. Remember to flag as spoiler.

That's the basic difference between fixed tests and random tests. With fixed input values, the expected values are also fixed, with random input values you have to calculate the output somehow, and store it in a var normally.

It was marked as a Question, not as an Issue. About what exp is, it's the expected value (a string) calculated with a control function.

Your code is wrong.

Not a kata issue.

think about the spoiler flag, when you're posting somewhat "critical" informations about/under a solution, please. ;)

+ is obtained putting the plus between two "back ticks": ``` (three of them, here)

for code: two new lines, three back ticks, new line, your code, new line three back ticks:

your code here