Decode the Slanted Ciphertext
A medium-tier problem at 49% community acceptance, tagged with String, Simulation. Reported in interviews at Grammarly and 0 others.
Decode the Slanted Ciphertext shows up on Grammarly's assessment, and at 49% acceptance, it's brutal for candidates who miss the spatial trick. The problem looks deceptively simple: read a ciphertext that's been written in a rail-fence or zigzag pattern, then recover the original message. Most people either brute-force every permutation or miscount the grid dimensions on their first attempt. If you blank on how the slant works during your live OA, StealthCoder reads the problem and serves the solution in seconds, invisible to the proctor.
Companies that ask "Decode the Slanted Ciphertext"
Decode the Slanted Ciphertext 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 pattern here is simulation. You're not doing complex math or graph traversal. You're simulating how characters get written and read in a slanted formation. The trick is understanding that the ciphertext is the result of a specific traversal pattern, and you need to reverse-engineer which character goes where. Most candidates try to decode column by column, miss the zigzag logic, and waste 20 minutes. The acceptance rate stays low because the problem requires you to mentally model the grid structure and trace the path correctly. String manipulation is your tool, but simulation is the real skill being tested. When the pattern clicks, the code is short. Until then, you're guessing. StealthCoder handles this in the assessment if you hit a wall.
Pattern tags
You know the problem.
Make sure you actually pass it.
Decode the Slanted Ciphertext 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.
Decode the Slanted Ciphertext interview FAQ
Is this really asked at Grammarly? How common is it?+
Yes. Grammarly reports it. Company-specific problems appear in their online assessments. This isn't a generic LeetCode staple, so if you're targeting Grammarly, drilling this pattern matters. It won't show up everywhere.
What's the actual trick to solving it?+
Recognize that the ciphertext is written in a zigzag or rail pattern, then reverse the process. Simulate the path the original message would take when encoded that way, then match the ciphertext characters to positions. Get the pattern right, the solution is clean.
Why is the acceptance rate so low if it's just string and simulation?+
Because the zigzag logic is unintuitive. Most people mismodel the grid or off-by-one the position mapping. You have to trace carefully and test on examples. Rushing leads to wrong submissions.
Do I need advanced data structures for this?+
No. Arrays, strings, and index math are enough. No hash maps, heaps, or trees required. The challenge is logic and tracing, not architecture.
How does this relate to other string and simulation problems?+
It's about reversing a deterministic process. Similar to spiral matrix traversals or snake-pattern reads. If you've solved zigzag or rail-fence cipher problems before, this pattern will feel familiar. If not, you're learning a new spatial trick.
Want the actual problem statement? View "Decode the Slanted Ciphertext" on LeetCode →