LeetCode 171. 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 -> 1
B -> 2
C -> 3
…
Z -> 26
AA -> 27
AB -> 28

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

class Solution {

public:

int titleToNumber(string s) {

int ans = 0;

for(int i = 0; i < s.length(); i++) {

ans = ans*26 + s[i] - 'A' + 1;

}

return ans;

}

};

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