168.Excel Sheet Column Title

168.Excel Sheet Column Title

难度:Easy

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"

实际上是26进制的数的转换,但是起始点是1开始,所以每次循环取模时,需要-1.

class Solution {
public:
string convertToTitle(int n) {
string res;
while(n>26)
{
int t=(n-1)%26;
cout<<t<<endl;
res= char('A'+t) +res;
n=(n-t)/26;
}
// cout<<n<<endl;
return char('A' +n-1) + res;
}
};

执行用时 :4 ms, 在所有 C++ 提交中击败了72.89%的用户 内存消耗 :8 MB, 在所有 C++ 提交中击败了63.84%的用户