Buddy, the algorithm itself is half the battle. After that, there is a problem with the time limit for code execution. The code should consider the number "99" as one match, like "90" or "999".

6kyu 4Head 4Head 4Head

Nah, im too dumb to solve this. Some kind of math problem. xD

up to 100 you have: 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99... so there are 19 number with at least one 9....

How long does it take on your other platform to compute the result for input 123416523412365217623567890987654321?

Same issue here... I can run the code on other platform and it works just fine, but I get the timeout error here... I think that the issue is for big numbers, because it takes more than 12 seconds to get the solution. :(

Asked a mathemetician and google for a formula for this, both had no clue. HOW IS THIS ONLY 6 KYU???

Guys, if you find how to deal with this error, mention here plz

i have same error. I dont know way to solve this :)

getting Execution Timed Out (12000 ms) due big numbers i guess ^^

Most likely need to put the iterator as <= instead of just < to check up to and include the final number n.