171. Excel 表列序号

为保证权益，题目请参考 171. Excel 表列序号(From LeetCode).

解决方案1

CPP

//
// Created by lenovo on 2020-09-29.
//

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

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

int main() {
    return 0;
}

Python

# 171. Excel表列序号
# https://leetcode-cn.com/problems/excel-sheet-column-number/


class Solution:
    def titleToNumber(self, columnTitle: str) -> int:
        ans = 0

        for i, n in enumerate(reversed(columnTitle)):
            ans += (ord(n) - ord("A") + 1) * (26 ** i)

        return ans

if __name__ == "__main__":
    solution = Solution()