Excel Sheet Column Number

2017/12/11 posted in  leetcode 

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

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