This is the string version of Problem 1035. Generate a vector like 1,2,2,3,3,3,4,4,4,4

Generate a string like abbcccddddeeeee

So if n = 3, then return

 'abbccc'

And if n = 5, then return

 'abbcccddddeeeee'

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Last Solution submitted on Mar 10, 2026

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