leetcode171 Excel Sheet Column Number-zh

# 171. Excel表列序号 (opens new window)

# 题目描述

给定一个Excel表格中的列名称，返回其相应的列序号。

例如，

    A -> 1
    B -> 2
    C -> 3
    ...
    Z -> 26
    AA -> 27
    AB -> 28 
    ...

示例 1:

输入: "A"
输出: 1

示例 2:

输入: "AB"
输出: 28

示例 3:

输入: "ZY"
输出: 701

致谢：
特别感谢 @ts 添加此问题并创建所有测试用例。

# 解法

# Python3

class Solution:
    def titleToNumber(self, columnTitle: str) -> int:
        res = 0
        for c in columnTitle:
            res = res * 26 + (ord(c) - ord('A') + 1)
        return res

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# Java

class Solution {
    public int titleToNumber(String columnTitle) {
        int res = 0;
        for (char c : columnTitle.toCharArray()) {
            res = res * 26 + (c - 'A' + 1);
        }
        return res;
    }
}

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# TypeScript

function titleToNumber(columnTitle: string): number {
    let res: number = 0;
    for (let char of columnTitle) {
        res = res * 26 + char.charCodeAt(0) - 64;
    }
    return res;
};

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# C++

class Solution {
public:
    int titleToNumber(string columnTitle) {
        int res = 0;
        for (char c : columnTitle) {
            res = res * 26 + (c - 'A' + 1);
        }
        return res;
    }
};

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# ...

编辑

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上次更新: 2021/10/30, 12:58:38

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