LeetCode: 171 Excel Sheet Column Number(easy)

题目:

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

代码:

 class Solution {
public:
int titleToNumber(string s) {
map<char, int> map;
int num = ;
int result = ;
for (char i = 'A'; i<='Z'; i++){
map[i] = num;
num++;
}
int j = ;
for(auto c = s.crbegin(); c<s.crend(); c++){
result = map[*c]*pow(, j) + result;
j++;
} return result;
}
};
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