leetcode-excel sheet column title

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

/*what if we assume that A equals to 0*/
public class Solution {
public String convertToTitle(int n) {
StringBuffer result=new StringBuffer();
while(n>0){
n--;
char a=(char)(n%26+'A');
result.append(a);
n=n/26;
}
return result.reverse().toString();
}
}

想法就是转换成我们熟悉的从0开始的每次对每一位处理都要先减去1

方法2

public class Solution {
public String convertToTitle(int n) {
StringBuffer result=new StringBuffer();
while(n>0){
int remain=n%26;
if(remain==0){
result.append("Z");
n=n/26-1;
}else{
char a=(char)(remain-1+'A');
result.append(a);
n=n/26;
}
}
return result.reverse().toString();
}
}