LeetCode-Excel Sheet Column Title
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Problem:
Given a positive integer, return its corresponding column title as appear in an Excel sheet.
For example:
1 -> A2 -> B3 -> C...26 -> Z27 -> AA28 -> AB
Analysis:
要求是用字母表示数字,1-26用A-Z表示,超过26的用A-Z分别代表进位的26个权值,实质上该题是10进制转26进制但是A等价于0
Anwser:
找了一位大牛的代码,从这段代码中可以学到更多的有关进制转换的问题。
该代码巧妙的利用了递归的方法:
public class Solution { public String convertToTitle(int n) { return n<=0?"":convertToTitle((n-1)/26)+(char)('A'+(n-1)%26); }}
其实上段代码也可以写成一般的形式,而非一行代码,如:
public class Solution { public String convertToTitle(int n) { if(n<=0) return ""; else { int num = (n-1) / 26; int res = (n-1) % 26; return convertToTitle(num)+(char)(res+'A'); } }}
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