LeetCode in Kotlin
168. Excel Sheet Column Title
Easy
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
Solution
class Solution {
fun convertToTitle(columnNumber: Int): String {
var num = columnNumber
val sb = StringBuilder()
while (num != 0) {
var remainder = num % 26
if (remainder == 0) {
remainder += 26
}
if (num >= remainder) {
num -= remainder
sb.append((remainder + 64).toChar())
}
num /= 26
}
return sb.reverse().toString()
}
}