Minimum Moves to Convert String
A easy-tier problem at 57% community acceptance, tagged with String, Greedy. Reported in interviews at Zoho and 0 others.
You've got a string and need to convert it to all X's with the minimum number of moves. Zoho asks this one, and it tests whether you think greedy or get trapped in a suboptimal loop. The acceptance rate hovers around 57%, which is lower than you'd expect for an Easy tag. That gap usually means candidates overthink it or miss the greedy pattern entirely. If this shows up on your live OA and you blank on why the obvious approach fails, StealthCoder surfaces a working solution in seconds while the proctor sees nothing.
Companies that ask "Minimum Moves to Convert String"
Minimum Moves to Convert String 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. Made for the engineer who has done the work but might still blank with a webcam pointed at him.
Get StealthCoderThe trap is assuming you need to track state or simulate the conversion process. The greedy insight is simpler: count how many X's you already have, then the answer is just the total length minus that count. Or count the non-X characters. But the real gotcha is understanding why a character-by-character simulation fails or why any approach that tries to be clever about adjacent moves is unnecessary. String problems that feel like they need simulation often don't. Greedy shines when you realize the answer is just a count or a single pass. The 57% acceptance suggests half the field either overcomplicates the logic or misreads the problem statement. When you hit this live and the naive solution doesn't click, StealthCoder bypasses the dead-end thinking and shows you the clean path.
Pattern tags
You know the problem.
Make sure you actually pass it.
Minimum Moves to Convert String recycles across companies for a reason. It's easy-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. Made for the engineer who has done the work but might still blank with a webcam pointed at him. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Minimum Moves to Convert String interview FAQ
Why is the acceptance rate so low if this is marked Easy?+
Candidates either misread what 'minimum moves' means or build unnecessary state machines to track conversions. The greedy solution is a single-pass count. The gap between difficulty tag and acceptance rate is a red flag to slow down and verify your understanding against small test cases before coding.
How does the Greedy topic actually apply here?+
Greedy means making the locally optimal choice at each step. Here it means recognizing that you don't need to optimize the order or grouping of moves. The minimum is simply a fixed calculation based on the current string composition, not a search or dynamic problem.
Is this problem still asked by Zoho or just a historical entry?+
Zoho is the reported company in the data. Whether it's still active in their current loop is unknown, but Zoho is known for string and greedy problems, so it fits their pattern. Plan for it as a realistic interview question.
What's the common mistake that tanks the acceptance rate?+
Simulating or iterating through moves one by one instead of solving it with math or a single pass. Also misinterpreting whether you count X's or non-X's, or confusing the problem statement about what a 'move' is.
How do I know when to stop overthinking and trust a simple answer?+
Test your solution on edge cases: empty string, all X's, all other characters, length 1. If the simple formula passes all of them in under 30 seconds, you're done. Overthinking usually fails one edge case and forces a rewrite.
Want the actual problem statement? View "Minimum Moves to Convert String" on LeetCode →