一、题目
Given a string columnTitle that represents the column title as appears in an Excel sheet, return its corresponding column number.
For example:
A -> 1
B -> 2
C -> 3
…
Z -> 26
AA -> 27
AB -> 28
…
Example 1:
Input: columnTitle = “A”
Output: 1
Example 2:
Input: columnTitle = “AB”
Output: 28
Example 3:
Input: columnTitle = “ZY”
Output: 701
Constraints:文章来源：https://www.toymoban.com/news/detail-825855.html
1 <= columnTitle.length <= 7
columnTitle consists only of uppercase English letters.
columnTitle is in the range [“A”, “FXSHRXW”].文章来源地址https://www.toymoban.com/news/detail-825855.html
二、题解
class Solution {
public:
int titleToNumber(string columnTitle) {
int n = columnTitle.size();
int res = 0;
long long mul = 1;
for(int i = n - 1;i >= 0;i--){
int k = columnTitle[i] - 'A' + 1;
res += k * mul;
mul *= 26;
}
return res;
}
};
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