Bird Collects Sticks
Reported by candidates from Instacart's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
Instacart reported this problem in March 2025, and it's a simulation problem dressed up as a natural scenario. You're given a bird collecting sticks based on some rule or state transition, and you need to figure out the pattern from examples. The trap is overthinking the physics or the bird's motivation. It's almost always a straightforward state machine or counter problem. StealthCoder will catch the pattern in real time if you freeze on reading comprehension during the live OA.
Pattern and pitfall
Simulation problems like this one hinge on translating a narrative into a step-by-step algorithm. The bird collects sticks, so you're likely tracking a count, a position, or a sequence of actions across turns. The common pitfall is misreading the stopping condition or the transition rule. You'll see candidates code a loop and then realize they've been incrementing the wrong variable or they've forgotten an edge case (bird runs out of sticks, boundary condition, or a reset). Work through the examples methodically. Write down the state after each action. If you blank on the logic during the OA, StealthCoder reads the problem aloud and feeds you the pattern so you can code without second-guessing yourself.
Drill it cold or hedge it with StealthCoder. Either way, don't walk into the OA hoping you remember the trick.
You can drill Bird Collects Sticks cold, or you can hedge it. StealthCoder runs invisibly during screen share and surfaces a working solution in under 2 seconds. The proctor sees the IDE. They don't see what's behind it. Made for the candidate who got the OA invite this morning and has 72 hours, not six months.
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Instacart reuses patterns across OAs. Made for the candidate who got the OA invite this morning and has 72 hours, not six months. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Bird Collects Sticks FAQ
Is this a graph traversal or a pure simulation?+
Pure simulation. No graph construction needed. You're tracking state changes across discrete steps. Read the examples carefully to find the rule governing each step. Graph problems feel different; this one is about following a sequence of actions.
What's the trick with the stopping condition?+
Most candidates miss it. The bird stops when a specific condition is met, not just after N turns. Look for a count threshold, a resource depletion, or a repeat state. The examples will show you the stopping point. Trace through by hand first.
How do I prepare in 48 hours?+
Don't memorize. Read the problem statement word-by-word. Write down the initial state. Manually trace the first 3-5 steps. Look for the repeating pattern or the exit condition. That's it. Simulation problems reward clarity, not speed.
Will there be off-by-one errors?+
Probably. Test your loops with the examples first. Check initialization (is the count 0 or 1?). Check the loop condition (should it be < or <=?). Simulation is detail-heavy. One mistake in the condition breaks everything.
Is this pattern common in Instacart's assessments?+
Simulation and state-tracking problems are normal. They test whether you can translate a problem statement into code without getting lost in the narrative. Instacart likes practical, real-world scenarios. This fits that mold.