LeetCode 171.Excel Sheet Column Number (Excel表列序號)
題目描述:
給定一個Excel表格中的列名稱,返回其相應的列序號。
例如,
A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28
...
示例 1:
輸入: "A"
輸出: 1
示例 2:
輸入: "AB"
輸出: 28
示例 3:
輸入: "ZY"
輸出: 701
AC C++ Solution:
class Solution { public: int titleToNumber(string s) { int n = s.size(); int res = 0; int tmp = 1; for(int i = n; i >= 1; i--) { res += (s[i-1] - 'A' + 1) * tmp; tmp *= 26; } return res; } };
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