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LeetCode: 168. Excel Sheet Column Title


LeetCode: 168. Excel Sheet Column Title

题目描述

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"

解题思路

进制转换。本题实际是将十进制数转换为 26 进制数。

AC 代码

class Solution {
public:
string convertToTitle(int n) {
string ans;

while(n)
{
ans.push_back((n-1)%26+'A');
n = (n-1)/26;
}

reverse(ans.begin(), ans.end());

return ans;
}
};


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