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ExcelSheetColumnTitle.swift
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ExcelSheetColumnTitle.swift
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//
// ExcelSheetColumnTitle.swift
// LeetCode
//
// Created by 黎赵太郎 on 20/03/2018.
// Copyright © 2018 lizhaotailang. All rights reserved.
//
// Given a positive integer, return its corresponding column title as appear in an Excel sheet.
//
// For example:
//
// 1 -> A
// 2 -> B
// 3 -> C
// ...
// 26 -> Z
// 27 -> AA
// 28 -> AB
//
// Accepted. See [ExcelSheetColumnTitleTests](./LeetCodeTests/ExcelSheetColumnTitleTests.swift) for test cases.
//
import Foundation
class ExcelSheetColumnTitle {
func convertToTitle(_ n: Int) -> String {
var newN = n
var builder = Array<String>.init()
while newN != 0 {
if newN % 26 == 0 {
builder.append("Z")
newN -= 26
} else {
builder.append(String(Character(UnicodeScalar(newN % 26 - 1 + Int("A".unicodeScalars.first!.value))!)))
newN -= newN % 26
}
newN /= 26
}
builder.reverse()
return builder.joined(separator: "")
}
}