Connect with fellow learners in the PlacePrep Discord communityㆍ Join now →

R's PlacePrep

Popular drives

TCSNQT (National Qualifier Test)InfosysIRT (InfyTQ Recruitment Test)AccentureCognitive & Technical Assessment

Also hiring

WiproNLTH (National Level Talent Hunt)CognizantGenC Assessment CapgeminiGame-Based Assessment

Browse all 14 companies TCS NQT 2026

Real placement papers from the drives you are actually sitting for

14 companies · 48 papersStart practising

Select your branch

Computer Science & EngineeringBEU previous year papers and solutions Mechanical EngineeringBEU previous year papers and solutions Electrical & Electronics EngineeringBEU previous year papers and solutions

More branches

Civil EngineeringBEU previous year papers and solutions Aeronautical EngineeringBEU previous year papers and solutions

All branches Computer Science

Previous year questions

University papers, sorted by subject and year with worked solutions

BEU Solved PapersOpen the archive

Core CS

Data Structures & AlgorithmsComplexity analysis up to graphs and DP.Operating SystemsProcesses, scheduling, memory and concurrency.Database Management SystemsRelational modelling, transactions and indexing.Computer NetworksFrom wires and radio waves up to the web.

Learn & scale

AI Inference EngineeringQuantization, batching and KV caching in production.System DesignScalable systems from first principles.Context EngineeringDesigning the context that LLMs actually reason over.Docker & KubernetesContainers and orchestration, explained.

All 15 courses Authors

Structured courses that start at zero and end somewhere useful

15 courses · free foreverBrowse courses

Companies PYQ Learn

Compiler Design

Foundations of Compilation4

Lexical Analysis6

Parsing & Grammars7

Syntax-Directed Translation & Semantics5

Runtime Environments4

Intermediate Code Generation4

Local Optimization & Data Flow Analysis5

Basic blocks and control flow graphs
Local optimizations and common subexpression elimination
Data flow analysis: constant propagation and liveness, across the whole graph
Peephole optimization and loop optimizations
Putting it together, a complete optimization pipeline

Design Your First Compiler6

Lessons

Contribute, invite only

Compiler Design

Foundations of Compilation4

Lexical Analysis6

Parsing & Grammars7

Syntax-Directed Translation & Semantics5

Runtime Environments4

Intermediate Code Generation4

Local Optimization & Data Flow Analysis5

Basic blocks and control flow graphs
Local optimizations and common subexpression elimination
Data flow analysis: constant propagation and liveness, across the whole graph
Peephole optimization and loop optimizations
Putting it together, a complete optimization pipeline

Design Your First Compiler6

Learn Compiler Design Local Optimization & Data Flow Analysis

Contribute, invite only

Basic blocks and control flow graphs

Chopping TAC into straight-line chunks with no internal jumps, and connecting those chunks into a graph that shows every possible path through a program.

9 min readUpdated 2026-09-03compiler-designoptimizationcontrol-flow-graphbasic-blocks