[LeetCode]Excel Sheet Column Number
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Question
Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
A -> 1B -> 2C -> 3...Z -> 26AA -> 27AB -> 28
本题难度Easy。
26进制
【复杂度】
时间 O(N) 空间 O(1)
【思路】
就是进行26进制转换即可。
【代码】
public class Solution { public int titleToNumber(String s) { //require int sum=0; //invariant for(int i=0;i<s.length();i++){ sum=sum*26+s.charAt(i)-'A'+1; } //ensure return sum; }}
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