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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| # Excel 表列序号 | ||
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| > 难度：简单 | ||
| > | ||
| > https://leetcode.cn/problems/excel-sheet-column-number/description/ | ||
| ## 题目 | ||
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| 给你一个字符串 `columnTitle` ，表示 `Excel` 表格中的列名称。返回 该列名称对应的列序号 。 | ||
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| 例如： | ||
| ```typescript | ||
| A -> 1 | ||
| B -> 2 | ||
| C -> 3 | ||
| ... | ||
| Z -> 26 | ||
| AA -> 27 | ||
| AB -> 28 | ||
| ... | ||
| ``` | ||
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| ### 示例 1: | ||
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| ```typescript | ||
| 输入: columnTitle = "A" | ||
| 输出: 1 | ||
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| ``` | ||
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| ### 示例 2: | ||
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| ```typescript | ||
| 输入: columnTitle = "AB" | ||
| 输出: 28 | ||
| ``` | ||
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| ### 示例 3: | ||
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| ```typescript | ||
| 输入: columnTitle = "ZY" | ||
| 输出: 701 | ||
| ``` | ||
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| ## 题解 | ||
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| ### typescript | ||
| ```typescript | ||
| export function titleToNumber(columnTitle: string): number { | ||
| let res = 0; | ||
| const A = 'A'.charCodeAt(0) - 1; | ||
| const n = columnTitle.length; | ||
| for (let i = 0; i < n; i++) { | ||
| const c = columnTitle.charCodeAt(n - 1 - i); | ||
| // console.log(columnTitle[n - 1 - i], c) | ||
| res = res + (c - A) * Math.pow(26, i) | ||
| } | ||
| return res; | ||
| } | ||
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| // titleToNumber('ZY'); // AB ZY | ||
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| ``` | ||
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| ### python3 | ||
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| ```python | ||
| import math | ||
| class Solution: | ||
| def titleToNumber(self, columnTitle: str) -> int: | ||
| res = 0; | ||
| _A = ord('A') - 1 | ||
| n = len(columnTitle) | ||
| # print(n) | ||
| for i in range(n): | ||
| c = ord(columnTitle[n - i - 1]) | ||
| res = res + (c -_A) * math.pow(26, i) | ||
| return int(res) | ||
| # s = Solution() | ||
| # print(s.titleToNumber('A')) | ||
| # print(s.titleToNumber('AB')) | ||
| # print(s.titleToNumber('ZY')) | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| import math | ||
| class Solution: | ||
| def titleToNumber(self, columnTitle: str) -> int: | ||
| res = 0; | ||
| _A = ord('A') - 1 | ||
| n = len(columnTitle) | ||
| # print(n) | ||
| for i in range(n): | ||
| c = ord(columnTitle[n - i - 1]) | ||
| res = res + (c -_A) * math.pow(26, i) | ||
| return int(res) | ||
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| # s = Solution() | ||
| # print(s.titleToNumber('A')) | ||
| # print(s.titleToNumber('AB')) | ||
| # print(s.titleToNumber('ZY')) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| import { describe, expect, it } from 'vitest' | ||
| import { titleToNumber } from '.' | ||
| describe('Excel 表列序号', () => { | ||
| describe('first', () => { | ||
| testCase(titleToNumber) | ||
| }) | ||
| }) | ||
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| function testCase(fn: (columnTitle: string) => number) { | ||
| it.each([ | ||
| // test cases | ||
| ['A', 1], | ||
| ['AB', 28], | ||
| ['ZY', 701], | ||
| ])('示例%#', (columnTitle, expected) => { | ||
| expect(fn(columnTitle)).toBe(expected) | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| export function titleToNumber(columnTitle: string): number { | ||
| let res = 0; | ||
| const A = 'A'.charCodeAt(0) - 1; | ||
| const n = columnTitle.length; | ||
| for (let i = 0; i < n; i++) { | ||
| const c = columnTitle.charCodeAt(n - 1 - i); | ||
| // console.log(columnTitle[n - 1 - i], c) | ||
| res = res + (c - A) * Math.pow(26, i) | ||
| } | ||
| return res; | ||
| } | ||
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| // titleToNumber('ZY'); // AB ZY |