[Algorithm] 171. Excel Sheet Column Number
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
...Example 1:
Input: "A"
Output: 1Example 2:
Input: "AB"
Output: 28Example 3:
Input: "ZY"
Output: 701
Basiclly, it is 26-based, the same as 10-based,
102 = 1 + 1
previous result * 10 + 0 + 1*10+0=10
previous result * 10 +2 + 10*10+2=102
AAA =
1 +
1 * 26 +1
27 * 26 + 1 = 703
/**
* @param {string} s
* @return {number}
*/
var titleToNumber = function(s) { if (!s) {
return 0;
} let sum = 0;
let len = s.length;
for (let i = 0; i < len; i++) {
sum = sum * 26 + (s[i].charCodeAt() - 64);
} return sum;
};
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