Zigzag string conversion

Row assignment on a virtual fence.

strings math

Implement `convert(s: str, numRows: int) -> str`.

Constraints

1 ≤ len(s) ≤ 10^5; 1 ≤ numRows ≤ min(len(s), 1000)

Example

>>> convert("PAYPALISHIRING", 3)
"PAHNAPLSIIGYIR"

22 points ~20 min

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Hints

Assign each char to a row (0..numRows-1) cycling up/down; join rows.

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