168. 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
难度EASY。相当于是26进制转换,稍微做点处理。
class Solution {
public:
string convertToTitle(
int n) {
string s =
"";
while(n)
{
int x = --n %
26;
s +=
'A' + x;
n /=
26;
}
reverse(s.begin(),s.end());
return s;
}
};
还有一种更简单的写法,避免用Reverse,直接利用递归栈的思想。 如下:
class Solution {
public:
string convertToTitle(
int n) {
return n ==
0 ?
"" : convertToTitle(n /
26) + (
char) (--n %
26 +
'A');
}
};