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
26进制转10进制，注意以‘A‘而不是0开头，因此要“+1”
C++:
1 class Solution { 2 public: 3 int titleToNumber(string s) { 4 int num=0; 5 for(int i=0;i<s.length();i++) 6 num=num+pow(26,i)*(s[s.length()-i-1]-64); 7 8 return num; 9 } 10 };
Python:
1 class Solution: 2 # @param s, a string 3 # @return an integer 4 def titleToNumber(self, s): 5 num=0 6 for i in range(0,len(s)): 7 num=num+pow(26,i)*(ord(s[len(s)-i-1])-64) 8 return num 9 10 //ord与chr作用相反 11 //ord 字符转整型 12 //chr 整型转字符
【leetcode】Excel Sheet Column Number
原文：http://www.cnblogs.com/jawiezhu/p/4394450.html