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
水题
class Solution { public: int titleToNumber(string s) { int len=s.length(); int i,j; int sum=0; for(i=0;i<len;i++) { sum*=26; sum+=s[i]-'A'+1; } return sum; } };
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