Consider the sequence formed by the multiples of 19:
19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228,…
A new sequence can be constructed by concatenating the digit to the left of the comma and the digit to the right of the comma:
93, 85, 77, 69, 51, 41, 31, 21, 11, 2, 92,…
Notice that leading zeros are omitted.
Write a function to apply this operation, known as the comma transform, to a sequence.
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Last Solution submitted on Sep 14, 2026

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Tim George Berken goc3 Christian Schröder

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