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Online Coding Assessment (OA1) — Amazon Preparation | SourCa

Stage 01: Coding Assessment Stage 02: Leadership Principles SJT

Amazon•Software Development Engineer (SDE-1) / Support Engineer•Stage 01: Algorithmic Coding•70 Mins

Online Coding Assessment (OA1)

2 algorithmic programming problems evaluated on HackerRank: Dynamic programming, graph algorithms, and constrained data structures.

Official Amazon SDE OA1 format on HackerRank.

Stage Practice SetAlgorithmic Coding

251 Questions

193 company-mapped + general practice

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COMPREHENSIVE PRACTICE SET

Curated Practice Questions (251)

Solve problems aligned with Amazon's assessment pattern. Use the filters below to search by topic, algorithm, or question format.

193 Company-Mapped58 Practice Material

#01•Company-Mapped•Standard assessment problem across Amazon, Google, TCS Digital, and Accenture ASE coding rounds.

Two Sum Target Indices

DSA & Problem Solving•Arrays & Hash Maps•Coding

#02•Company-Mapped•Frequently reported in Microsoft Codility OA, TCS Digital, and Infosys Specialist Programmer rounds.

Maximum Subarray Sum (Kadane's)

DSA & Problem Solving•Arrays & Dynamic Programming•Coding

#03•Company-Mapped•Amazon SDE-1, Cisco Software OA, and Walmart Global Tech placement rounds.

Longest Substring Without Repeating Characters

DSA & Problem Solving•Sliding Window & Hash Sets•Coding

#04•Company-Mapped•High-frequency problem in Google Online Challenge, Amazon SDE-1, and Goldman Sachs Engineering rounds.

Trapping Rain Water

DSA & Problem Solving•Two Pointers & Monotonic Arrays•Coding

#05•Company-Mapped•Adobe, Cisco, Infosys, and Cognizant GenC Elevate technical coding assessments.

Binary Tree Level Order Traversal

DSA & Problem Solving•Trees & Breadth First Search•Coding

#06•Company-Mapped•Amazon SDE-1 OA, Flipkart Machine Coding / DSA, and Goldman Sachs Engineering Campus OA.

Coin Change (Minimum Coins)

DSA & Problem Solving•Dynamic Programming•Coding

#07•Company-Mapped•Amazon SDE-1, Microsoft Codility, Google OA, and Cisco technical coding assessment.

Course Schedule & Cycle Detection (Topological Sort)

DSA & Problem Solving•Graphs & Topological Sort•Coding

#08•Company-Mapped•Amazon SDE-1, TCS Digital, Infosys, and Cognizant GenC coding assessment.

Best Time to Buy and Sell Stock

DSA & Problem Solving•Arrays & Dynamic Programming•Coding

#09•Company-Mapped•Amazon SDE, Google, Microsoft, Adobe, and Flipkart OA.

Search in Rotated Sorted Array

DSA & Problem Solving•Binary Search•Coding

#10•Company-Mapped•Amazon SDE-1, Microsoft, Cisco, and Qualcomm coding test.

Product of Array Except Self

DSA & Problem Solving•Prefix & Suffix Arrays•Coding

#11•Company-Mapped•High-frequency problem in Amazon SDE, Google OA, Microsoft, and TCS Digital coding assessments.

Merge Overlapping Intervals

Data Structures & Algorithms•Intervals & Sorting•Coding

#12•Company-Mapped•Amazon, Infosys DSE/SP, Cisco, and Adobe coding assessments.

Longest Palindromic Substring

Data Structures & Algorithms•Strings & Two Pointers•Coding

#13•Company-Mapped•Google OA, Adobe, Capgemini Senior Analyst, and Amazon SDE OA.

Container With Most Water

Data Structures & Algorithms•Two Pointers•Coding

#14•Company-Mapped•Amazon SDE-1, Microsoft OA, Walmart Global Tech, and Qualcomm software assessments.

Word Break Problem

Data Structures & Algorithms•Dynamic Programming•Coding

#15•Company-Mapped•Amazon, Microsoft, Oracle, Bloomberg, and Goldman Sachs campus coding tests.

Lowest Common Ancestor of a Binary Tree

Data Structures & Algorithms•Binary Trees & Recursion•Coding

#16•Company-Mapped•Amazon, Google, Bloomberg, Microsoft, and Infosys SP technical assessments.

Number of Islands

Data Structures & Algorithms•Graphs & Grid Traversal•Coding

#17•Company-Mapped•Amazon, Goldman Sachs, TCS Prime, and Microsoft interview assessments.

Kth Largest Element in an Array

Data Structures & Algorithms•Heaps & Quickselect•Coding

#18•Company-Mapped•Google OA, Directi, Uber, and Amazon SDE-2 campus challenges.

Sliding Window Maximum

Data Structures & Algorithms•Monotonic Queue & Sliding Window•Coding

#19•Company-Mapped•Amazon, Morgan Stanley, Infosys SP, and Cisco software engineer OA.

Rotting Oranges

Data Structures & Algorithms•Graphs & Multi-source BFS•Coding

#20•Company-Mapped•Cisco, Adobe, TCS Prime, and Microsoft SDE placement drives.

Daily Temperatures

Data Structures & Algorithms•Monotonic Stack•Coding

Showing 20 of 251 questions