【LeetCode】(171)Excel Sheet Column Number(Easy)
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题目
Excel Sheet Column Number
Total Accepted: 38048 Total Submissions: 103856My SubmissionsRelated 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
解析
题目特别简单,其实就是26进制,如果思路理不清楚的话,想象一下十进制是怎么操作的,然后把10换成26就好了。
class Solution {public: int titleToNumber(string s) { int sum = 0;for (int i = 0;i<s.size();i++){int k = s[i]-'A'+1;sum = sum*26+k;}return sum; }};不过耗时有点多,不知道有没有省时间的方法。
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