Minimum Buckets
Reported by candidates from TikTok's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
TikTok's March 2024 OA included Minimum Buckets, a deceptively simple string problem that trips up candidates who over-engineer. You're given a string with gifts (represented as characters) and you need to find the minimum number of buckets required to store them, typically with some constraint like no two gifts of the same type in one bucket or a specific arrangement rule. The trick isn't complicated, but the edge cases matter. StealthCoder will catch what you miss if you blank on the constraint interpretation during the live assessment.
Pattern and pitfall
Minimum Buckets is fundamentally a greedy counting or simulation problem. The pattern is almost always: iterate through the string, track state (which gifts are in the current bucket), and decide when to move to the next bucket based on the given constraint. Most candidates overcomplicate it by thinking they need dynamic programming or some exotic data structure. The real work is parsing the constraint correctly and implementing the state machine cleanly. Common pitfall: misreading whether you can repeat a gift type or not, or missing that the order of gifts matters. If you get stuck on the constraint interpretation during your OA, StealthCoder reads the exact problem text and suggests the greedy simulation path immediately.
Memorize the pattern. If you can't, run StealthCoder. The proctor sees the IDE. They don't see what's behind it.
You can drill Minimum Buckets 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 by an engineer who treats the OA as theater. If yours is tonight, you don't have time to grind. You have time to hedge.
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TikTok reuses patterns across OAs. Made by an engineer who treats the OA as theater. If yours is tonight, you don't have time to grind. You have time to hedge. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Minimum Buckets FAQ
What's the actual constraint in Minimum Buckets?+
The problem text wasn't shared in reports, but TikTok's version typically restricts either repetition of gift types per bucket or requires a specific arrangement. Read the constraint three times before coding. It usually rules out a brute-force approach and guides you toward greedy.
Is this a greedy or DP problem?+
Greedy, almost certainly. You process the string left to right, decide locally whether the current gift fits in the current bucket, and move to a new bucket when forced. DP is overkill here. If you find yourself writing a recursive function with memoization, backtrack.
What's the common pitfall candidates hit?+
Misinterpreting whether the constraint is per-bucket or global. Example: 'no two gifts of the same type in one bucket' means you can have type A in bucket 1 and again in bucket 2, but not twice in bucket 1. Read closely.
How do I test my solution on the OA?+
Trace through small examples: a string of length 1, a string with all same characters, and a mixed string. Make sure your bucket counter increments at the right moments. Edge case: empty string (usually returns 0).
Will this pattern show up in other TikTok OAs?+
String simulation problems with greedy logic are common at TikTok. Once you solve Minimum Buckets, you've internalized the state-machine thinking that applies to other similar constraints. It's a warmup problem, not a curveball.