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Leetcode: Excel Sheet Column Number


题目:

Related 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



解答:

其实质是将26进制数转成十进制数字

class Solution {
public:
int titleToNumber(string s)
{
int num = 0;
int temp = 0;
for (int i = 0; i < s.length(); i++)
{
temp = s[i] - 'A' + 1;
num = 26 * num + temp;
}
return num;
}
};



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