Leetcode171. Excel Sheet Column Number

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 

Credits:
Special thanks to @ts for adding this problem and creating all test cases.

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C++代码

class Solution {public:   int titleToNumber(string s) {int n = s.size();int i = n-1;int sum = 0;while (i>=0){sum += (s[i] - 64)*pow((double)26, n-1-i);i--;}return sum;}};