Know coding from A to Z. Literally.

Odd or even, leap year, biggest of three — service company tests repeat these if-else classics every single year. Free marks once conditions feel natural.

Loops + pattern printing (star pyramids!) are the #1 most-asked type in TCS and Cognizant written rounds. Master nested loops and patterns become easy marks.

Prime, Armstrong, digit-sum, reverse — the evergreen number problems of Infosys and Wipro papers. One % 10 trick powers half of them.

Around 40% of placement coding questions involve arrays. Traversal, largest/smallest, reverse — the bread and butter of every coding round.

Palindromes, vowel counts, character frequency — string questions appear in every service company paper. They test the same 4-5 tricks again and again.

Binary search is the single most-asked algorithm in placement tests. Sorting basics turn many "hard-looking" questions into two lines.

Three real interview questions, no hand-holding. Clear this gate and you are genuinely ready for the TCS NQT / Infosys / Wipro coding round.

Recursion is the gateway to trees, graphs and DP. Interviewers use it to check you truly understand the call stack — not just memorised syntax.

Two pointers, sliding window, prefix sums, Kadane — four patterns that crack hundreds of "hard" questions. Product companies test these constantly.

Stacks power undo, browsers and parsers. "Valid parentheses" and "next greater element" are two of the most repeated interview questions in India.

The interviewer's favourite pointer test. Reversal, middle-finding and cycle detection appear in almost every product-company phone screen.

Trees separate the prepared from the crammers. Height, traversals and leaf-counting are the exact warm-ups interviewers open with before harder tree rounds.

Maps, networks, friend circles — graphs run the real world. BFS/DFS are mandatory for any product-company interview; components is the classic follow-up.

Three classics asked at Amazon, Microsoft and Google. Clear the Summit and you can walk into any Indian product-company interview with confidence.