leetcode_171题——Excel Sheet Column Number（简单数学题）

Excel Sheet Column Number

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Question  Solution 

 

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.

 

class Solution {

public:

    int titleToNumber(string s) {

        	int len=s.size();

	int last_reault=0;

	int j=0;

	for(int i=len-1;i>=0;i--)

	{

		last_reault+=(s[i]-64)*pow(26.0,j);

		j++;

	}

	return last_reault;

    }

};