[LeetCode] 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
给定Excel的表格标题,求相对应的列号。类似于进制转换,每一位的进制位为26。对给定字符串从右向左进行累加即可。
class Solution { public: int titleToNumber(string s) { int sum = 0; int t = 0; for (int i = s.size() - 1; i >= 0; i--) { sum += ((s[i] - 'A' + 1) * pow(26, t++)); } return sum; } }; // 3 ms