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Excel Sheet Column Title - Math - Easy - LeetCode - MiniTV

Excel Sheet Column Title - Math - Easy - LeetCode - मिनी टीवी

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 
    ...
Example 1:

Input: 1
Output: "A"
Example 2:

Input: 28
Output: "AB"
Example 3:

Input: 701
Output: "ZY"

public class Solution {
    public string ConvertToTitle(int n) {
        var sb = new StringBuilder();        
        while(n>0){
            int mod = (n%26==0?26:n%26);
            char ch = (char) (64+mod);            
            sb.Append(ch.ToString());            
            n = (n%26==0? n/26-1: n/26);           
        }
        
        var res = sb.ToString();
        return Reverse(res);
    }
    
    public static string Reverse( string s )
    {
        char[] charArray = s.ToCharArray();
        Array.Reverse( charArray );
        return new string( charArray );
    }
}

Time Complexity: O(n)

Space Complexity: O(1)