首页 > 技术文章 > 【LeetCode】171. Excel Sheet Column Number

ganganloveu 2014-12-29 10:40 原文

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.

 

26进制转10进制,注意以'A'而不是0开头,因此要“+1”

class Solution {
public:
    int titleToNumber(string s) {
        int ret = 0;
        for(int i = 0; i < s.size(); i ++)
            ret = ret*26 + (s[i]-'A'+1);
        return ret;
    }
};

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