Capital One Software Engineer Coding & Algorithms Interview Questions
Practice 17 real Coding & Algorithms interview questions for Software Engineer roles at Capital One.
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"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
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"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."
Reorder a String by Alternating Its Left and Right Ends
Reorder a String by Alternating Its Left and Right Ends Given a string text, construct a new string by taking characters in this order: 1. first chara...
Count Pairs of Cyclically Equivalent Integers
Count Pairs of Cyclically Equivalent Integers Two non-negative integers are cyclically equivalent when their standard decimal strings have the same le...
Sort Every Concentric Matrix Border Clockwise
Sort Every Concentric Matrix Border Clockwise Given a nonempty rectangular integer matrix, process each concentric layer independently. For a layer, l...
Arrange Match Results in Repeating Win-Draw-Loss Order
Arrange Match Results in Repeating Win-Draw-Loss Order You are given a string containing only W, D, and L. Rearrange all characters into rounds. In ea...
Solve four algorithmic coding tasks
You are given four independent coding tasks. They may be solved in any order, and partial test-case credit is awarded for each task. The tasks are rou...
Sort Matrix Diagonals By Their Values
Given an n x n matrix of lowercase letters, consider every diagonal that runs from bottom-left to top-right. There are 2n - 1 such diagonals. Assign e...
Build a Banking System with Activity Rankings
Build a Banking System with Activity Rankings Problem Implement an in-memory banking system that processes these operations: - CREATE_ACCOUNT account_...
Solve powers, phases, grid pops, and swaps
Solve the following four problems: 1) Count powers of k in an array: Given an array of positive integers nums and an integer k >= 1, return how many e...
Implement deposit, withdraw, and transfer in a class
Problem Implement a class AccountService that supports basic money operations on accounts. Operations - deposit(accountId, amount) - withdraw(accountI...
Remove nodes with a given value
This question evaluates proficiency in singly linked list manipulation, specifically pointer handling and in-place node removal, and falls under the C...
Place Pieces on a Grid
Given integers n and m, and an ordered list figures where each element is one of "A", "B", "C", "D", or "E", construct an n x m integer matrix grid. T...
Apply commands to transform a matrix
You are given an integer matrix A of size n × m and a list of string commands to apply in order. Implement the commands and return the final matrix. C...
Count Numbers With Odd Zeros
Given an array a of non-negative integers, count how many elements contain an odd number of digit '0' in their decimal representation. Notes: - Treat ...
Solve string merge and grid path tasks
Question Given two equal-length strings s1 and s2, create a new string by iterating i = 0 … n-1, comparing s1[i] with s2[n-1-i]: append s1[i]; if the ...
Solve multiple algorithmic interview questions
Below are several independent coding tasks. For each task, implement a function that returns the required output. Assume: - Arrays/lists are 0-indexed...
Count ordered pairs that concatenate to target
Given a list of integers numbers and an integer target, count the number of ordered pairs (i, j) with i != j such that concatenating numbers[i] follow...
Implement 2D transforms and find max-lit point
Part A — 2D array transforms: Given an m×n integer matrix, implement the following in-place operations with clear function boundaries and complexity: ...