Given a column title as appear in an Excel sheet, return its corresponding column number.
计算26进制数一样
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| class Solution { | |
| public: | |
| int titleToNumber(string s) { | |
| int res = 0; | |
| for (int i = 0; i<s.size(); i++) { | |
| res = 26*res + s[i]-'A'+1; | |
| } | |
| return res; | |
| } | |
| }; |
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