题目连接
https://leetcode.com/problems/excel-sheet-column-number/
Excel Sheet Column Number
Description
Related to question Excel Sheet Column Title
Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
A -> 1 B -> 2 C -> 3 ... Z -> 26 AA -> 27 AB -> 28
class Solution {
public:
int titleToNumber(string s) {
int ans = 0, k = 1;
size_t n = s.length();
reverse(s.begin(), s.end());
for (size_t i = 0; i < n; i++) {
int x = s[i] - 'A' + 1;
ans += (int)(x * pow(26, i));
}
return ans;
}
};