Excel Sheet Column Number
Given a string columnTitle that represents the column title as appears 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: columnTitle = "A"
Output: 1
Example 2:
Input: columnTitle = "AB"
Output: 28
Example 3:
Input: columnTitle = "ZY"
Output: 701
Constraints:
1 <= columnTitle.length <= 7
columnTitle consists only of uppercase English letters.
columnTitle is in the range ["A", "FXSHRXW"].
思路一:26 进制换算
public int titleToNumber(String columnTitle) {
char[] chars = columnTitle.toCharArray();
int ans = 0;
int val = 0;
int j = 0;
for (int i = chars.length - 1; i >= 0; i--) {
val = (int) Math.pow(26, j);
j++;
ans += (chars[i] - 'A' + 1) * val;
}
return ans;
}
标签:26,val,int,columnTitle,easy,ans,Input,leetcode,171
From: https://www.cnblogs.com/iyiluo/p/17038673.html