Coding & Algorithms Interview Questions
Practice 3,469 real Coding & Algorithms interview questions for 2026. Covers companies like Meta, Amazon, Google, Uber, and Microsoft. Real questions from actual interviews with detailed solutions — ideal for focused interview preparation. Coding & Algorithms interview questions are the single most common technical gate for software engineering roles and are used to evaluate problem framing, algorithm selection, complexity trade-offs, correctness, edge-case reasoning, and clear communication under time pressure. Expect this category to appear in early technical screens and repeatedly across onsite loops at companies that weight it heavily (notably Meta, Google, and Amazon). Interviews will test arrays and strings, trees and graphs, dynamic programming, hashing and two‑pointer techniques, and the candidate’s ability to test and optimize code in a shared editor. Prepare with timed mock interviews, practice in the same editor you’ll use live, and build a progressive schedule that moves from fundamentals to medium/hard problems; typical candidates invest several weeks to a few months of focused practice depending on seniority and target company.
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"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Find power-of-two subarrays within sum range
Find power-of-two subarrays within sum range Given an integer array nums and an integer k, find all subarrays whose length is a power of two and whose...
Find buildings with rightward view
Find buildings with rightward view You are given an array of building heights aligned along a street that faces the ocean to the right. Return the ind...
Decide palindrome within k deletions
Decide palindrome within k deletions Given a string s and integer k, decide whether s can be transformed into a palindrome by deleting at most k chara...
Apply sliding window techniques
Apply sliding window techniques Explain the sliding window technique and apply it to solve: ( 1) Given an array of positive integers and a target S, r...
Sort products by price and attention score
You are given a list of strings, each formatted as "product,price,attention". Parse the list into records and return the product names sorted to prior...
Convert integer to NAF form
Question Convert a given integer into its Non-Adjacent Form (NAF) representation such that no two non-zero digits are adjacent, and prove that the res...
Remove duplicates in linked list
Question Given a linked list, remove all duplicate values so that each value appears only once. Provide solutions for both sorted and unsorted linked ...
Solve programming task with follow-ups
Question Pure programming problem solving: implement the core algorithmic solution, then extend it to ( 1) support a constraint of consecutive N eleme...
Count interval intersections
Question For a list of n segments, where each segment i has start[i] and end[i], compute for every segment the count of other segments that intersect ...
Count subarrays with ≥k identical pairs
Question LeetCode 2537. Count the Number of Good Subarrays – Given an integer array nums and an integer k, return the number of contiguous subarrays i...
Compute minimum delivery days
Question Given N distribution centers numbered 1..N and an orderCityList of length M where orderCityList[i] denotes the city that the i-th order must ...
Compute delay times in priority array
Question Given an array of integers representing task priorities processed from right to left, return an array where each element is the distance (ind...
Solve grid shortest path and robot cleaning
Question LeetCode 1091. Shortest Path in Binary Matrix; LeetCode 489. Robot Room Cleaner https://leetcode.com/problems/shortest-path-in-binary-matrix/...
Compute earliest arrival in time-grid
Question LeetCode 778. Swim in Rising Water – Given an n x n integer grid where grid[i][j] is the earliest time you can enter the cell, starting from ...
Expand algebraic expression with distribution
Question Given an expression of lowercase letters, '+', '', and parentheses with no '+' outside any parentheses, return an equivalent expression conta...
Verify and modify inorder subsequence
Question Given a binary tree and a sequence of numbers, design an algorithm to check in O(n) time and O( 1) extra space whether the sequence is a subs...
Compute drawdown, profit, and coin change
Question What is the maximum drawdown of a cumulative PnL (profit and loss) series, and when did it occur? Implement a function mdd(pnl) that returns ...
Solve message splitting and board crushing
Question LeetCode 2468. Split Message Based on Limit – Given a message string and a per-line width, split it into parts adding the suffix "<i/n>" (e.g...
Find Lowest Common Ancestor with Parents
Question LeetCode 1650. Lowest Common Ancestor of a Binary Tree III Compute the time and space complexity of your solution https://leetcode.com/proble...
Minimize image processing cost with discount
Question You have n images. For the i-th image, processing costs filterCost[i] per day and must run from startDay[i] to endDay[i] inclusive. Each day ...