168. Excel Sheet Column Title

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Given an integer columnNumber, return its corresponding column title as it appears in an Excel sheet. For example: A -> 1 B -> 2 C -> 3 ... Z -> 26 AA -> 27 AB -> 28 ... Example 1: Input: columnNumber = 1 Output: "A" Example 2: Input: columnNumber = 28 Output: "AB" Example 3: Input: columnNumber = 701 Output: "ZY" Constraints: - 1 <= columnNumber <= 231 - 1

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