Sofi Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Format words into wrapped/justified lines
You are given a list of words (strings with no spaces) and an integer maxWidth. Implement text formatting in two variants: Variant A — Basic word wrap...
Implement a multithreaded task executor with semaphores
Design and implement a thread-safe TaskExecutor that limits concurrent work using a semaphore-like mechanism. You are given an interface similar to: -...
Generate all permutations of an array
Problem Given an array nums of distinct integers, return all possible permutations of the array. A permutation is an ordering of all elements in the a...
Count numbers with same popcount up to all-ones bound
Problem For any positive integer n, define f(n) as the smallest integer >= n whose binary representation consists only of 1 bits. Equivalently, if k i...
Find the second most frequent tag
You are given a list of strings in the following repeating order: [id1, name1, tag1, id2, name2, tag2, ...] So every 3 consecutive elements describe o...
Rearrange array to maximize positive prefix sums
Problem You are given an integer array a of length n. You may rearrange the elements in any order. Define the prefix sums of a permutation p as: - pre...
Find maximum-occurring character in a string
Problem Given a non-empty string s, return the character that occurs the most times in s. Tie-breaking If multiple characters have the same maximum fr...
Count completed car journeys from sensor logs
You are given a time-ordered list of highway sensor logs. Each log entry contains: - timestamp (integer; strictly increasing) - sensor_type (one of "E...
Implement chance of a personal best
You are given a simplified model for tracking race times on an obstacle course. - A course has a fixed number of obstacles. - A run records the time s...
Solve Time-Window and Binary Swap Problems
This online assessment contained two coding problems: 1. Maximum requests in a time window You are given a non-decreasing integer array requestTimes...
Design a key-value store with getLast
Design and implement an in-memory key–value store with this API: add(key, value), get(key), remove(key), and getLast(). The operation getLast() must r...
Simulate 1-D collisions and scale to huge inputs
Given an array of integers representing objects on a 1-D track, where the sign indicates direction (positive moves right, negative moves left) and the...
Determine reachability and minimum jumps
Given an array of non-negative integers nums of length n, where nums[i] is the maximum number of steps you can move forward from index i: ( 1) Determi...
Find Kth Unique Maximum
You are given two integer arrays sorted in non-decreasing order. Each array may contain duplicates, and the same value may appear in both arrays. Find...
Implement tree ops and LRU cache
Question Implement set(index) and clear(index) for the leaves of a full binary tree initially filled with 0s, where a parent node becomes 1 only when ...