Code Bites (@codebitesin60)

A hash set turns "is this a jewel?" into one instant check. Here's the whole trick in Python. Follow @codebitesin60 for a coding bite a day.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm…

Fast and slow pointers in Python aren't faster than counting nodes, an interviewer was right about that. But counting never ends on a cyclic list, and Floyd's trick still does. Which 'pointless' trick got you in an interview? #floydcycle #python #leetcode #learntocode #pythoncoding #devtok…

Remove nth node from end of list in Python, one pass with two pointers. Keep them n apart and slow lands right before the target every time. Do you count the length first, or go straight to two pointers? #leetcode #python #devtok #learntocode #pythoncoding #codinginterview #programming #codebites…

Merge two sorted lists in Python gets way cleaner with a dummy head node. Takeaway: put a fake node in front and the head stops being an edge case. Do you still write the null checks first? #leetcode #python #devtok #learntocode #pythoncoding #codinginterview #programming #codebites

Valid parentheses in Python is the most-asked easy and people still miss the last line. Push the closer you expect, pop and compare on every closer, then check the stack is empty. Did your first version forget the leftover openers? #leetcode #python #dynamicprogram #devtok #datastructures…

Climbing stairs in Python is just Fibonacci in disguise. You never need the whole table, only the last two answers, so two variables beat the recursive tree. Did you spot the Fibonacci pattern first try? #leetcode #python #dynamicprogram #devtok #datastructures #learntocode #softwareengineering…

Middle of linked list in Python without counting nodes first. Two pointers, one moving twice as fast: when fast runs out, slow is sitting on the middle. Did you know it returns the second middle on even lengths? #linkedlist #leetcode #python #codinginterview #devtok #pythoncoding #programming…

Reverse a string in place without slicing. Two pointers swap from both ends and march inward. Follow @codebitesin60.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm #hashmaps…

Push every zero to the end without breaking the order. A slow pointer parks the non-zeros up front. Follow @codebitesin60.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm #hashmaps…

Can you build the note from the magazine's letters? Count the magazine once, then spend letters as you go. Follow @codebitesin60.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm #hashmaps…

Reverse a linked list in place by flipping one arrow at a time. Three pointers, no extra list. Follow @codebitesin60.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm #hashmaps…

Is there a loop in this list? Send a slow pointer and a fast one — if they ever meet, there's a cycle. Follow @codebitesin60.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm #hashmaps…

How deep does a tree go? Each node asks its children, adds one, and the recursion counts the levels. Follow @codebitesin60. #leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm #hashmaps…

Mirror a whole tree with one move per node: swap its two children, all the way down. Follow @codebitesin60. #leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm #hashmaps #majorityelement…

The array is sorted, so skip the hash map. Two pointers close in on the target sum in one pass. Follow @codebitesin60. #leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm #hashmaps…

Check a palindrome without reversing anything. Two pointers walk inward and compare as they go. Follow @codebitesin60 for a coding bite a day.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm…

Which element shows up more than half the time? Count as you go and return the moment one passes n/2. Follow @codebitesin60.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites #hacking #interview #algorithm #hashmaps…

Find the first non-repeating character without rescanning the string every time. One frequency map does it. Follow @codebitesin60.#leetcode #coding #python #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites

Is there a repeat within k positions? Store each value's last index and check the gap. One pass. Follow @codebitesin60.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites

Reversing a string in Python is almost too easy 😅 One line, and here's exactly why [::-1] works.#leetcode #python #coding #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites

Are these two words anagrams? Count the letters, compare the maps. O(n) and clean. 🔤 #leetcode #coding #python #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites

Checking for duplicates the slow way is O(n²). Here's the O(n) trick with a hash set every dev should know. #leetcode #coding #python #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites

POV: the interview question everyone gets first 👇 Two Sum in O(n) with a hash map — no nested loops needed. Save this for your next interview prep. 🧠 #leetcode #coding #python #codinginterview #programming #learntocode #techtok #datastructures #softwareengineering #codebites