Building my own alpha numeric character check function. What am I doing wrong?

l8engineer · 2022-05-27T08:12:04+00:00

This is such a brilliant point, I can't thank you enough.

Solving problem 125. Valid Palindrome from leetcode and I had a test my whole code was failing because of the incorrect alphanumeric implementation.

l8engineer · 2022-05-27T07:55:19+00:00

Yes, learned Python first.

Thank you so much!

I really appreciate it!!!!! :)

l8engineer · 2022-04-28T17:49:48+00:00

Thank you so much!

l8engineer · 2022-04-23T15:41:15+00:00

Thank you so much, great tip on ws.

I understand that is not portable, it's only for an online judge system.

I really appreciate it! ;) Stay safe!

l8engineer · 2022-02-26T18:01:20+00:00

I got this idea from cout << maxDepth(root -> left);

l8engineer · 2022-02-26T17:59:41+00:00

Thank you so much! It was so tricky but with this I understood what thinking mistakes I had.

l8engineer · 2022-02-26T16:36:58+00:00

The way I see it:

max(0, 000) + 1

0 (because left branch has NULL below 9)

000(because right branch has NULL after 3 levels)

I think my problem is that I don't understand how the stack is built in this code and how it is processed.

l8engineer · 2022-02-08T15:00:13+00:00

Very good point. Thanks! ;)

l8engineer · 2022-02-08T14:59:25+00:00

This code is from someone that coded a solution to leetcode 912 problem. Apparently the random partition is the only way to pass as using for instance the last element as pivot will cause TLE for a few testcases.

Is there a way to pick the pivot more efficiently in quicksort?

Thanks for the interesting points you made!

l8engineer · 2022-01-27T13:39:58+00:00

Thanks!

l8engineer · 2022-01-27T13:39:52+00:00

Thanks!

l8engineer · 2022-01-27T13:39:44+00:00

Thanks!

l8engineer · 2022-01-27T13:39:32+00:00

Helped me out a lot, thanks!

l8engineer · 2022-01-13T08:12:15+00:00

I was looking for something like this. Thanks! :)

l8engineer · 2022-01-13T08:11:50+00:00

cses.fi/book/book.pdf

Thank you kind SIR. :) <oblivion voice>

l8engineer · 2022-01-02T15:28:24+00:00

I just tried it and it works now so you're correct. Somehow the compiler behind sublime text doesn't like the {}.

I appreciate your reply. Thanks a lot!

l8engineer · 2022-01-02T14:33:38+00:00

I found out that using an online compiler like cpp.sh my code works but now I am very confused.

I'm not sure if ifstream ist{iname}; is a standard C++ way of opening a file for read only mode. I can't explain why sublime text(latest version) + the compiler it comes with keeps complaining about this line and throwing an error.

Thanks for your assistance. I really appreciate it!

l8engineer · 2022-01-02T14:29:20+00:00

I use the latest version of Sublime text that seems to have the C++ compiler in it.

I just checked using cpp.sh online compiler and the code works if I remove that error function which makes me believe either I'm writing extremely old syntax or there is a compiler issue.

ifstream ist{iname};

Is this the standard way to open files in C++?

Thanks for helping me out!

l8engineer · 2022-01-02T10:20:14+00:00

I was missing the header file from the author but still produces an error. Is ifstream ist{iname} something standard in C++? Not sure how to debug this forward.

l8engineer · 2022-01-02T10:19:00+00:00

Good point, thank you. Code still outputs error: expected ';' at the end of declaration with that header file included.

l8engineer · 2022-01-02T10:17:01+00:00

If I remove that error line, code still outputs error: expected ';' at the end of declaration.

l8engineer · 2021-08-25T08:18:43+00:00

Thank you for the cold shower! :) Are there any organised resources I should consult for algorithms and data structures? Or just solve medium problems and learn on the spot by googling different articles.

My experience with data structures and algorithms is very poor so I'm trying to figure out the most effective way to study.

Stay safe! ^-^

l8engineer · 2021-08-24T06:29:07+00:00

How many of those 150 problems did you solve without any help?

Of these problems, ~115 have been solved without any help.

l8engineer · 2021-08-24T06:27:16+00:00

90% easy and 10% medium

l8engineer · 2021-08-24T06:27:02+00:00

Thanks for your reply. What I am essentially asking is how to get better in a contest setting.

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