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Abbreviation#1547
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Abbreviation#1547
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| /** | ||
| * @description | ||
| * Given two strings, `source` and `target`, determine if it's possible to make `source` equal | ||
| * to `target` You can perform the following operations on the string `source`: | ||
| * 1. Capitalize zero or more of `source`'s lowercase letters. | ||
| * 2. Delete all the remaining lowercase letters in `source`. | ||
| * | ||
| * Time Complexity: (O(|source|*|target|)) where `|source|` => length of string `source` | ||
| * | ||
| * @param {String} source - The string to be transformed. | ||
| * @param {String} target - The string we want to transform `source` into. | ||
| * @returns {Boolean} - Whether the transformation is possible. | ||
| * @see https://www.hackerrank.com/challenges/abbr/problem - Related problem on HackerRank. | ||
| */ | ||
| export const isAbbreviation = (source, target) => { | ||
| const sourceLength = source.length | ||
| const targetLength = target.length | ||
| // Initialize a table to keep track of possible abbreviations | ||
| let canAbbreviate = Array.from({ length: sourceLength + 1 }, () => | ||
| Array(targetLength + 1).fill(false) | ||
| ) | ||
| // Empty strings are trivially abbreviatable | ||
| canAbbreviate[0][0] = true | ||
| for (let sourceIndex = 0; sourceIndex < sourceLength; sourceIndex++) { | ||
| for (let targetIndex = 0; targetIndex <= targetLength; targetIndex++) { | ||
| if (canAbbreviate[sourceIndex][targetIndex]) { | ||
| // If characters at the current position are equal, move to the next position in both strings. | ||
| if ( | ||
| targetIndex < targetLength && | ||
| source[sourceIndex].toUpperCase() === target[targetIndex] | ||
| ) { | ||
| canAbbreviate[sourceIndex + 1][targetIndex + 1] = true | ||
| } | ||
| // If the current character in `source` is lowercase, explore two possibilities: | ||
| // a) Capitalize it (which is akin to "using" it in `source` to match `target`), or | ||
| // b) Skip it (effectively deleting it from `source`). | ||
| if (source[sourceIndex] === source[sourceIndex].toLowerCase()) { | ||
| canAbbreviate[sourceIndex + 1][targetIndex] = true | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return canAbbreviate[sourceLength][targetLength] | ||
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| import { isAbbreviation } from '../Abbreviation.js' | ||
| const expectPositive = (word, abbr) => | ||
| expect(isAbbreviation(word, abbr)).toBe(true) | ||
| const expectNegative = (word, abbr) => | ||
| expect(isAbbreviation(word, abbr)).toBe(false) | ||
| describe('Abbreviation - Positive Tests', () => { | ||
| test('it should correctly abbreviate or transform the source string to match the target string', () => { | ||
| expectPositive('', '') | ||
| expectPositive('a', '') | ||
| expectPositive('a', 'A') | ||
| expectPositive('abcDE', 'ABCDE') | ||
| expectPositive('ABcDE', 'ABCDE') | ||
| expectPositive('abcde', 'ABCDE') | ||
| expectPositive('abcde', 'ABC') | ||
| expectPositive('abcXYdefghijKLmnopqrs', 'XYKL') | ||
| expectPositive('abc123', 'ABC') | ||
| expectPositive('abc123', 'ABC123') | ||
| expectPositive('abc!@#def', 'ABC') | ||
| }) | ||
| }) | ||
| describe('Abbreviation - Negative Tests', () => { | ||
| test('it should fail to abbreviate or transform the source string when it is not possible to match the target string', () => { | ||
| expectNegative('', 'A') | ||
| expectNegative('a', 'ABC') | ||
| expectNegative('aBcXYdefghijKLmnOpqrs', 'XYKLOP') | ||
| }) | ||
| }) |
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