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: 1
Example 2:
Input: "AB"
Output: 28
Example 3:
Input: "ZY"
Output: 701
难度:easy
题目:给定Excel 表单里的一列名,返回其整数表示。
思路:26进制
Runtime: 1 ms, faster than 100.00% of Java online submissions for Excel Sheet Column Number.
Memory Usage: 34.5 MB, less than 86.88% of Java online submissions for Excel Sheet Column Number.
class Solution {
public int titleToNumber(String s) {
int result = 0, scale = 1;
for (int i = s.length() - 1; i >= 0; i--) {
result += (s.charAt(i) - 'A' + 1) * scale;
scale *= 26;
}
return result;
}
}
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