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 -> 1B -> 2C -> 3...Z -> 26AA -> 27AB -> 28
26进制转10进制，注意以'A'而不是0开头，因此要“+1”,跟二进制转换成十进制一样。
class Solution {
public:int titleToNumber(string s) {int n=s.size();int result=0;int temp=1;for(int i=n-1;i>=0;i--){result=result+(s[i]-'A'+1)*temp;temp=temp*26;}return result;}
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