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...
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...
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...
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...
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...
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...
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 ...