Count and Say
A medium-tier problem at 61% community acceptance, tagged with String. Reported in interviews at Pinterest and 13 others.
Count and Say is a string manipulation problem that looks deceptively simple but trips up candidates who overthink or misread the spec. It's asked across a wide range of companies, from Meta and Amazon to financial shops like Wells Fargo and Akuna Capital. The acceptance rate hovers around 60 percent, meaning a solid chunk of people get it wrong on the first attempt. The trick isn't algorithmic complexity, it's understanding the exact pattern the problem describes and implementing the iteration cleanly. If this problem hits your live assessment and you blank on how to structure the next sequence, StealthCoder surfaces a working solution in seconds, invisible to the proctor.
Companies that ask "Count and Say"
Count and Say is the kind of problem that decides whether you pass. StealthCoder reads the problem on screen and surfaces a working solution in under 2 seconds. Invisible to screen share. The proctor sees nothing. Built by an engineer at a top-10 tech company who can solve these problems cold but didn't want to trust himself in a 90-minute screen share.
Get StealthCoderThe core mechanic is iterative: you describe what you see in the previous sequence by counting consecutive identical digits, then reading those counts and digits back as a string. It's not hard, but the devil is in the details. Most people understand the concept but mess up the iteration logic, boundary conditions, or the order of output. The string-building part is straightforward in any language, but candidates often over-engineer it or get stuck on off-by-one errors. The real prep work is dry-running the first few sequences by hand so the pattern clicks. It's a problem that rewards clarity over cleverness. StealthCoder becomes the hedge when you're under time pressure and need a clean, verified implementation without the mental tax of debugging your own string iteration.
Pattern tags
You know the problem.
Make sure you actually pass it.
Count and Say recycles across companies for a reason. It's medium-tier, and most candidates blank under the timer. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem and surfaces a working solution in under 2 seconds. Built by an engineer at a top-10 tech company who can solve these problems cold but didn't want to trust himself in a 90-minute screen share. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Count and Say interview FAQ
Is Count and Say actually asked at top companies?+
Yes. It appears in interview reports from Meta, Amazon, PayPal, Yahoo, and multiple others. It's not as frequent as some classic problems, but it's real. Acceptance rate around 60 percent suggests it's doable but not trivial for most candidates.
What's the main trick candidates miss?+
Misreading the exact output format or off-by-one errors in the grouping loop. The pattern is intuitive once you see it, but under interview pressure, people rush and hardcode wrong lengths or skip digits. Dry-running by hand first prevents this.
Is this a dynamic programming or advanced algorithm problem?+
No. It's pure string iteration and counting. The algorithmic bar is low. The value is in clean code and not making careless mistakes. Medium difficulty reflects implementation clarity, not algorithmic complexity.
What makes this harder than other string problems?+
It requires you to hold the rule in your head while coding. Unlike substring or pattern matching problems, you're generating output based on a sequence rule. If you misinterpret or implement the rule wrong, you cascade errors.
How much time should I spend drilling this?+
One clean solve by hand, then code it once. The pattern sticks fast. If you get it wrong on your first attempt, re-read the spec and trace through an example. Over-drilling doesn't buy you much here.
Want the actual problem statement? View "Count and Say" on LeetCode →