Today feels like April Fool’s Day 😭
What is happening with our teacher?
That OOP exam was something else. I don’t even know what to say about the result it really wasn’t me 💔

Good morning guys ☀️

I have a question for you all 👀

Do you learn for yourself, your future, and your dreams or mainly to make your family happy and proud?

Tell me your thoughts 👇

Top K Frequent Elements
I used a dictionary to count how many times each number appears in the array. Then I sorted the frequency pairs in descending order and selected the top k frequent elements.

My main confusion was understanding how to sort the dictionary using the frequency values instead of the keys, especially the part with

lambda x: x[1]

I also needed time to fully understand how result.items() becomes (number, result) pairs during sorting.

This problem helped me better understand frequency maps and Top K patterns in problem solving.

Valid Palindrome
The idea is to first normalize the string by converting it to lowercase and removing all non-alphanumeric characters, then check if it reads the same forward and backward.

My main mistake was not clearly understanding how to properly clean the string, especially removing symbols and spaces. I also initially overcomplicated it using unnecessary loops.

In the end, I learned that the most important step is preprocessing the string correctly before doing the palindrome check.

Do you think failure is necessary for success?

Good morning people ☺️

The idea is to encode a list of strings into one string using

length#word

then decode it back by reading the length first and extracting each word.

My mistake was mixing the logic in decode I tried to process the word while still searching for

#

which caused errors. I learned that decoding must follow a clear order find # read length, extract word, then move forward.

መልካም ሰንበት❤️

Roman to Integer
I first used a dictionary to map each Roman symbol to its value, then I traverse the string one by one.

For each character, I get its value and try to build the total answer.

My main confusion was that I was only focusing on the current character. I didn’t realize I also need to compare it with the next character to decide whether to add or subtract.

Now I understand:

If current value < next value → subtract
Otherwise → add

🙄ምርጫ እንዴት ነበር ?

Idea Your Opinion Needed

I’m thinking to start a small coding challenge in this channel.

💡 If someone solves a problem, I’ll give 50 Birr airtime
✔️ No AI allowed
✔️ Must explain the solution

Do you think this is a good idea and helpful?

Drop your thoughts 👇

Drop your thoughts not reaction😬

Integer to Roman

I used a dictionary and looped from largest to smallest value. For each value, I keep adding the symbol while it fits in the number and subtracting it.

My mistake was thinking like a list and trying to index the number instead of using a greedy approach.

💌
"God protect me from everyone's and my own stupidity."

#౨ৎ⠀
⠀⠀ ⠀⠀ ⠀⠀ ⠀⠀ ⠀⠀ ⠀⠀ ⠀⠀:¨ ·.· ¨:
⠀⠀ ⠀⠀ ⠀⠀ ⠀⠀ ⠀⠀ ⠀⠀ ⠀⠀ `· . 𐙚

እድገት ሲመጣ ከባድ ነገሩ የሚፈልገው focus ነው። pull request review ማድረግ ላይ ጎበዝ ሆነን ኢሜይል ቶሎ መመለስ ላይ ልንቸገር እንችላለን። ማኔጅመንት ጓ ሲል የጀመርነውን ቶሎ ለመጨረስ ስንሮጥ የሆነ ነገር ይረሳል።

አልፎ አልፎ መደናበር ያስፈልጋል። ማደግ የፈለገ ለመሰቃየት ዝግጁ መሆነ አለበት

መልካም የስራ ሳምንት

Product of Array Except Self

I learned that instead of multiplying everything each time, we split it into left and right products.

What I understood:

* Left = product of elements before index
* Right = product of elements after index
* Answer = left × right

My mistake I first tried brute😭 force instead of thinking in prefix/suffix way

👉 Use left and right products to solve in O(n) time.