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Questions about the science and art of determining properties of algorithms, often including correctness, runtime and space usage. Use the [runtime-analysis] tag for questions about the runtime of algorithms.

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Time complexity of finding subsequences of a string segmented into parts

Let $S$ be a string of length $N$, consisting of digits 0 to 9. For convenience, we assume $N$ to be a multiple of 3. Then, we split $S$ into $N/3$ equal parts, each of length 3. For each equal part …
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