[C++]LeetCode: 116 Excel Sheet Column Number (excel列坐标转数字)
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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
思路:这道题和Excel Sheet Column Title和是对应的。这道题要求我们将excel中字母转成数字。观察规律,我们只需要将每个字母对应的数字求出来,迭代增加就可以,注意excel表格字母数字对应关系是26进制的。
Attention:
1. 26个英文字母转对应数字。s[i] - 'A' + 1
ans = (s[i] - 'A' + 1) + ans * 26;
复杂度:O(N)
AC Code:
class Solution {public: int titleToNumber(string s) { int ans = 0; if(s.size() == 0) return ans; for(int i = 0; i < s.size(); i++) { ans = (s[i] - 'A' + 1) + ans * 26; } return ans; }};
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