DSA CHEAT SHEET — Save This Post!
Most Asked Patterns in TCS Infosys Amazon Interviews!

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90% of coding interviews use THESE 10 patterns.
Master these = crack any tech interview!

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PATTERN 1: TWO POINTERS
Use when: Sorted array, find pairs, remove duplicates
Problems: Two Sum, Reverse String, 3Sum
Logic: left=0, right=n-1, move based on condition
Companies: Amazon, Microsoft, TCS

PATTERN 2: SLIDING WINDOW
Use when: Subarray/substring with condition
Problems: Max sum subarray, Longest substring
Logic: Expand right, shrink left when invalid
Companies: Infosys, Wipro, Google

PATTERN 3: BINARY SEARCH
Use when: Sorted array, find position/condition
Problems: Search in rotated array, Find peak
Logic: mid = (lo+hi)//2, eliminate half each time
Companies: Amazon, Flipkart, Accenture

PATTERN 4: LINKED LIST (Fast & Slow Pointer)
Use when: Cycle detection, find middle
Problems: Detect cycle, Find middle, Palindrome
Logic: slow moves 1 step, fast moves 2 steps
Companies: TCS, Infosys, HCL

PATTERN 5: TREE BFS (Level Order)
Use when: Level-by-level traversal, shortest path
Problems: Level order, Zigzag, Right side view
Logic: Use queue, process level by level
Companies: Amazon, Cognizant, Capgemini

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PATTERN 6: TREE DFS
Use when: Path sum, depth, validate BST
Problems: Max depth, Path sum, Inorder traversal
Logic: Recursion — visit node, left, right
Companies: Microsoft, Wipro, IBM

PATTERN 7: DYNAMIC PROGRAMMING
Use when: Optimization, count ways, max/min
Problems: Fibonacci, Knapsack, LCS, Coin change
Logic: Break into subproblems, store results
Companies: Amazon, Goldman Sachs, Barclays

PATTERN 8: STACK
Use when: Matching brackets, next greater element
Problems: Valid Parentheses, Stock Span, Min Stack
Logic: Push/pop based on LIFO order
Companies: TCS, Accenture, Infosys

PATTERN 9: HASHING (HashMap)
Use when: Count frequency, find duplicates, grouping
Problems: Two Sum, Anagram, Group Anagrams
Logic: key=element, value=count/index
Companies: Google, Amazon, Flipkart

PATTERN 10: GREEDY
Use when: Local optimal = global optimal
Problems: Activity selection, Jump game, Intervals
Logic: Always pick the best option at each step
Companies: Wipro, HCL, Mindtree

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MUST KNOW COMPLEXITY:

Array access -> O(1)
Binary Search -> O(log n)
Linear Search -> O(n)
Bubble Sort -> O(n2)
Merge/Quick Sort-> O(n log n)
HashMap get/put -> O(1) average
BFS/DFS -> O(V + E)

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30-DAY DSA PLAN FOR PLACEMENTS:

Week 1: Arrays + Strings + Hashing
Week 2: Linked List + Stack + Queue
Week 3: Trees + Binary Search
Week 4: DP + Greedy + Mock Tests

Practice on: LeetCode / GeeksForGeeks
Target: 2 problems daily = 60 problems/month

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SAVE this post now!
You will need it before every interview!

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TRENDING TECH NEWS — June 13, 2026
What Every CS/IT Student Must Know Today!

Source: TechCrunch — Live Today
====================================

NEWS 1: SPACEX IPO — ELON IS WORLD'S FIRST TRILLIONAIRE!

SpaceX IPO closed UP 19% making Elon Musk
the world's FIRST trillionaire in history!

What it means for YOU:
-> SpaceX now actively hiring software engineers
-> Aerospace tech is the new hottest sector
-> Embedded systems + Python + C++ = space tech skills
Action: Add SpaceX to your dream company list now!

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NEWS 2: FAANG IS DEAD — MEET MANGOS!

The new top 6 tech companies in 2026:
M — Meta
A — Anthropic
N — Nvidia
G — Google
O — OpenAI
S — SpaceX

What it means for YOU:
-> Anthropic + OpenAI = AI companies to target
-> Nvidia hiring ML engineers at record pace
-> These 6 pay 20-80 LPA for freshers!
Action: Align your skills with MANGOS company needs!

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NEWS 3: MISTRAL RAISES 3 BILLION EUROS!

European AI startup Mistral valued at 20 BILLION!
Europe's biggest AI bet ever!

What it means for YOU:
-> Open source LLMs = growing fast (Mistral is FREE!)
-> Use Mistral API for free in your projects
-> Europe + AI = new job market opening up!
Action: Try Mistral AI API in your next project (FREE!)

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NEWS 4: GOOGLE SUES AI-POWERED SCAM RING!

Criminals used AI to scam hundreds of thousands
of people across multiple platforms!

What it means for YOU:
-> AI + Cybersecurity = most urgent hiring need
-> Security engineers now earning 12-25 LPA fresher
-> Ethical hacking + AI detection = rare combo skill
Action: Learn 1 cybersecurity tool this month (Wireshark/Burp)!

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NEWS 5: META AI TEAM IN TROUBLE!

Meta's AI division engineers describe it as
toxic workplace with no clear direction!

What it means for YOU:
-> Company culture matters — research before joining
-> Glassdoor reviews + LinkedIn employee posts = research
-> Startups with clear AI mission > big company chaos
Action: Before applying, always check employee reviews!

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THIS WEEK'S TOP SKILLS FOR MANGOS COMPANIES:

Python + ML (Nvidia, Anthropic, OpenAI)
React + Node JS (Meta, Google)
C++ + Systems (SpaceX, Nvidia)
Cybersecurity (Google, all MANGOS)
Open Source LLM integration (Mistral, Llama)

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LIVE JOB ALERT - Apply NOW!
Fresh IT Jobs for 2025/2026 Grads!

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DigiCert | Associate Software Engineer | Bengaluru
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