How many DSA questions are enough for placements? 

Search this question and you will get answers ranging from 50 to 500, none of them sourced. No credible source gives a single number, and the people who have thought hardest about interview preparation actively refuse to.

That sounds like a dodge, but the things you can pin down turn out to be more useful than a target. The standard problem lists have exact, checkable sizes. Real coding rounds have published structures. And there is research on what kind of practice sticks. Work from those and the number stops mattering.

What the standard lists contain

These are the sheets most people work through, with the counts as they stand today. Every number below was counted from the list itself, not from an article about it.

Blind 75 was put together by Yangshun Tay, a former Meta staff engineer, who describes it as “the most important 75 questions on LeetCode” and explains the reasoning: “Many other LeetCode questions are a mash of the techniques from these individual questions.” The name came from where he posted it, not from him. He has since distilled it further into a 50-question version. Tech Interview Handbook

If you work from the famous LeetCode repost, which has been viewed over 4.7 million times, one detail is worth catching: it lists 76 entries, not 75. “Merge K Sorted Lists” appears twice, filed under both Linked List and Heap. Six more are locked behind LeetCode Premium. So the real free count is lower than the name suggests. LeetCode

Grind 75 is the same author’s successor, again 75 problems, with a default schedule of 8 weeks at 8 hours a week, which the tool estimates at 64 hours total. It publishes its own difficulty split: 24 Easy, 42 Medium, 9 Hard. Tech Interview Handbook

NeetCode runs an escalating series: Blind 75 recategorised into its own topics, then NeetCode 150, then NeetCode 250. The 150 breaks down as 28 Easy, 101 Medium, 21 Hard, with the largest topics being Trees at 15, Graphs at 13 counting advanced graphs separately, and 1-D dynamic programming at 12. NeetCode

LeetCode Top Interview 150 is the platform’s own flagship, which it describes as “150 Original & Classic Questions” and “Best for 3+ months of prep time”. It also publishes a shorter LeetCode 75, marked “Best for 1~3 month of prep time”. LeetCode LeetCode

So the range the serious lists themselves define is roughly 75 to 250 for interview preparation. That is a far tighter band than the internet’s 50-to-500, and it comes from people who published their reasoning rather than from someone guessing. Learning the subject from scratch is a bigger job than revising it, and the full course sheets built for that run to several hundred problems, but that is a different project with a different timeline.

What the research says about how you practise

Cognitive psychology answers this better than coding blogs do.

In a 2006 study, students who repeatedly studied material outperformed students who repeatedly tested themselves when the final test came five minutes later. On tests two days and a week later, the result reversed and testing won substantially. The detail that matters most for anyone grinding problems is this: repeated studying “increased students’ confidence in their ability to remember the material” while producing worse actual retention. Psychological Science

That is the mechanism behind an experience many candidates describe. You work through hundreds of problems while reading editorials, you feel increasingly prepared, and then you freeze on a medium in a real interview. Feeling prepared and being prepared came apart, and the way you practised is what separated them.

A 2013 review of ten common study techniques found only two earned a high utility rating across ages, ability levels and subjects: practice testing and distributed practice, which means spreading sessions out rather than massing them. Psychological Science in the Public Interest

Translated to this problem: solving a problem cold, without looking, then returning to it days later, beats solving twice as many problems with the solution open. Daily practice over months beats a weekend of ten hours. Neither of those is about the count.

The author of Blind 75 makes the same argument from the practitioner side, telling readers to “treat it like a real coding interview and check through thoroughly before submitting”, and even to write their own test cases. He is also unusually blunt about what to skip: “Practically speaking the return of investment (ROI) on studying and practicing for DP questions is very low.” Tech Interview Handbook

What a real coding round looks like

Preparation should be shaped by the test you are sitting, and for most Indian freshers the first test is a mass-recruiter assessment.

TCS publishes its NQT structure on its own site: 81 questions across 220 minutes, split into a Foundation section of 65 questions in 75 minutes covering numerical, verbal and reasoning ability, and an Advanced section of 16 questions in 115 minutes covering advanced quantitative and reasoning ability plus advanced coding. There is a separate 30-minute psychometric. TCS iON

Two things follow from that official page. There is no coding at all in the Foundation section, so if you are aiming only at the base track, aptitude matters more than DSA. And the Advanced section is what unlocks the higher band: TCS states that “based on the performance in Part B - Advanced Section, candidates will be eligible for a higher salary range starting from ₹ 7 LPA”, against a fresher range it gives as ₹3 LPA to ₹8 LPA. TCS iON

TCS also states the test is English-only with no negative marking, runs every two to four weeks at authorised centres, and produces a scorecard valid for two years. TCS iON

What TCS does not publish is how many of those 16 Advanced questions are coding problems. You will read “two coding questions in 45 minutes” and “three coding questions in 90 minutes” stated as fact all over the internet. Neither appears on any TCS page. The 45-minute version does not even reconcile with the 115-minute Advanced block TCS publishes. Treat both as unconfirmed, and prepare for the section, not for a rumoured question count.

What candidates report

The accounts below come from public forums. They are individual experiences, not data, though the pattern across them is consistent.

The most-upvoted answer to “how many questions of leetcode is enough” on Blind is not a number but a scale: “10 if u already know everything, one is each major category. 50 if u are good at coding and analytical. 200 if your are out of touch, but still understand the logic, 500 if ur concepts are weak.” Another reply reframes it entirely: “It is not about how many question but which question. I’d say do it until medium feels easy and hard can be worked out in a decent amount of time.” Blind

An Indian final-year student from a tier-3 college documented doing “around 40 days did 200 LC’s (mostly medium level questions with a good schedule)”, getting rejected repeatedly, and eventually being selected. In the same account, one company’s online assessment was three problems in 90 minutes, of which he solved one, and he still progressed. LeetCode

A tier-3 graduate who had failed DSA rounds outright described working through a single structured sheet for three months, then clearing the rounds for a 16 LPA offer. His summary of what those rounds contained is the useful part: “There were DSA rounds but they were standard medium questions”. His own verdict on the earlier failure was “not giving DSA enough time was a big mistake from my side”. Reddit

A practical answer

Pick one list and finish it rather than sampling three. For interview preparation, something in the 75 to 150 band is what the people who built these lists consider sufficient coverage. If you are learning DSA from scratch rather than revising it, expect a longer syllabus and a longer timeline, and do not mistake one for the other.

Then judge readiness by behaviour instead of by count. The recurring standard in every serious discussion is being able to solve an unseen medium in roughly 20 to 30 minutes, explaining your approach aloud, without looking anything up. That test tells you where you are in a way a solved-problems counter cannot.

Practise the way the research says works. Attempt cold before reading any solution. Come back to problems days later instead of moving on permanently. Spread it across months instead of massing it into weeks. This is the difference between confidence and retention, and it is measurable.

Shape the preparation around the test in front of you. If your first hurdle is a mass-recruiter assessment, aptitude and reasoning carry the Foundation section and DSA only matters in the Advanced one, which is also the section attached to the higher salary band. And do not skip projects to grind problems, because clearing the coding round gets you into the interview, where your projects get probed. Both filters are real and they are different.

The count everyone argues about is a proxy for a question you can answer directly: is an unfamiliar problem now tractable for you under time pressure with someone watching? When it is, you have done enough. That happens for some people at 100 and for others at 400, and neither of those is a target.